Wall clock time and date at job start Tue Mar 31 2020 06:52:35 AMSOL-version 7.1 by G. D. Hawkins, D. J. Giesen, G. C. Lynch, C. C. Chambers, I. Rossi, J. W. Storer, J. Li, J. D. Thompson, P. Winget, B. J. Lynch, D. Rinaldi, D. A. Liotard, C. J. Cramer, and D. G. Truhlar Copyright 2004 by Regents of the University of Minnesota. All rights reserved. Notice: recipients of this code are asked to comply with the user agreement in Section 1 of the documentation file. ******************************************************************************* * 1SCF - SCF CALCULATION WITHOUT GEOMETRY OPTIMIZATION * - USE EF ROUTINE FOR MINIMUM SEARCH (DEFAULT) * GEO-OK - OVERRIDE INTERATOMIC DISTANCE CHECK * TLIMIT= - A TIME OF 15. SECONDS REQUESTED * CHARGE - CHARGE ON SYSTEM= -1 * AM1 - THE AM1 HAMILTONIAN TO BE USED * DEV - DEVELOPER OPTIONS ARE ALLOWED * SM5.42R - SM5.42R CALCULATIONS WILL BE PERFORMED * - CHARGE MODEL 2 WILL BE USED (CM2A) * - THE SOLVENT IS USER-SPECIFIED * DIELEC - THE SOLVENT DIELECTRIC CONSTANT IS 2.06 * IOFR - THE SOLVENT INDEX OF REFRACTION IS 1.4345 * ALPHA - THE SOLVENT ALPHA IS 0.00 * BETA - THE SOLVENT BETA IS 0.00 * GAMMA - THE SOLVENT MACROSCOPIC SURFACE TENSION IS * 38.93 CAL MOL^-1 ANGSTROM^-2 * FACARB - THE FRACTION OF AROMATIC CARBONS IS 0.00 * FEHALO - THE FRACTION OF ELECTRONEGATIVE HALOGENS IS 0.00 ******************************************************************************* Atom NO. Chemical Bond length Bond angle Dihedral angle number (k) symbol (angstroms) (degrees) (degrees) (I) NA:I NB:NA:I NC:NB:NA:I NA NB NC 1 1 C 2 2 C 1.50702 * 1 3 3 O 1.21282 * 119.99823 * 2 1 4 4 N 1.34769 * 120.00220 * 180.02562 * 2 1 3 5 5 C 1.39928 * 120.00564 * 174.83405 * 4 2 1 6 6 C 1.38944 * 120.03051 * 326.35448 * 5 4 2 7 7 C 1.38136 * 120.07035 * 180.02562 * 6 5 4 8 8 C 1.38180 * 120.13998 * 359.95750 * 7 6 5 9 9 C 1.38901 * 120.06985 * 359.97438 * 8 7 6 10 10 N 1.39925 * 120.03740 * 180.02562 * 9 8 7 11 11 C 1.34772 * 119.99696 * 146.77539 * 10 9 8 12 12 O 1.21282 * 120.00790 * 354.77868 * 11 10 9 13 13 C 1.50709 * 119.99627 * 174.78701 * 11 10 9 14 14 N 1.46894 * 109.46986 * 180.02562 * 13 11 10 15 15 C 1.46904 * 110.99882 * 293.94767 * 14 13 11 16 16 C 1.46902 * 111.00123 * 169.99814 * 14 13 11 17 17 C 1.50701 * 109.47036 * 189.99918 * 16 14 13 18 18 O 1.21275 * 120.00427 * 359.97438 * 17 16 14 19 19 N 1.34785 * 119.99524 * 180.02562 * 17 16 14 20 20 C 1.46496 * 120.00027 * 359.97438 * 19 17 16 21 21 C 1.46500 * 119.99804 * 180.02562 * 19 17 16 22 22 C 1.50698 * 109.47334 * 89.99198 * 21 19 17 23 23 H 1.07995 * 119.99863 * 0.02562 * 22 21 19 24 24 C 1.37880 * 119.99994 * 179.97438 * 22 21 19 25 25 N 1.31511 * 120.00059 * 0.02562 * 24 22 21 26 26 Si 1.86795 * 119.99964 * 180.02562 * 24 22 21 27 27 H 1.48502 * 109.46968 * 60.00188 * 26 24 22 28 28 H 1.48501 * 109.47205 * 180.02562 * 26 24 22 29 29 H 1.48503 * 109.47230 * 300.00523 * 26 24 22 30 30 C 1.38724 * 120.04055 * 146.60747 * 5 4 2 31 31 H 1.09004 * 109.46867 * 269.99864 * 1 2 3 32 32 H 1.09003 * 109.46922 * 29.99599 * 1 2 3 33 33 H 1.09000 * 109.47174 * 149.99703 * 1 2 3 34 34 H 0.97010 * 119.99749 * 354.83050 * 4 2 1 35 35 H 1.08009 * 119.96393 * 0.02562 * 6 5 4 36 36 H 1.07997 * 119.92810 * 179.97438 * 7 6 5 37 37 H 1.07996 * 119.96362 * 180.02562 * 8 7 6 38 38 H 0.96995 * 119.99526 * 326.50206 * 10 9 8 39 39 H 1.09007 * 109.46697 * 299.99510 * 13 11 10 40 40 H 1.09001 * 109.47142 * 59.99509 * 13 11 10 41 41 H 1.09004 * 109.47011 * 60.00638 * 15 14 13 42 42 H 1.09000 * 109.47373 * 179.97438 * 15 14 13 43 43 H 1.09002 * 109.47338 * 300.00185 * 15 14 13 44 44 H 1.08997 * 109.47194 * 309.99819 * 16 14 13 45 45 H 1.08993 * 109.46978 * 69.99562 * 16 14 13 46 46 H 1.08996 * 109.47539 * 90.00226 * 20 19 17 47 47 H 1.09003 * 109.46717 * 210.00290 * 20 19 17 48 48 H 1.08997 * 109.47294 * 330.00050 * 20 19 17 49 49 H 1.08996 * 109.47195 * 210.00259 * 21 19 17 50 50 H 1.09007 * 109.47018 * 329.99726 * 21 19 17 51 51 H 0.96995 * 120.00161 * 179.97438 * 25 24 22 52 52 H 1.07997 * 120.06711 * 359.97438 * 30 5 4 Note: An asterisk (*) indicates this parameter was or will be optimized. Cartesian coordinates (angstroms) NO. Atom X Y Z 1 6 0.0000 0.0000 0.0000 2 6 1.5070 0.0000 0.0000 3 8 2.1134 1.0504 0.0000 4 7 2.1809 -1.1671 -0.0005 5 6 3.5759 -1.1696 -0.1096 6 6 4.2155 -0.2001 -0.8723 7 6 5.5926 -0.2022 -0.9810 8 6 6.3384 -1.1671 -0.3314 9 6 5.7052 -2.1381 0.4337 10 7 6.4611 -3.1146 1.0916 11 6 6.0471 -3.6011 2.2783 12 8 5.0719 -3.1268 2.8214 13 6 6.7961 -4.7346 2.9307 14 7 6.1504 -5.0792 4.2043 15 6 6.2710 -3.9790 5.1703 16 6 6.7018 -6.3250 4.7539 17 6 5.8588 -6.7765 5.9187 18 8 4.8941 -6.1246 6.2579 19 7 6.1777 -7.9045 6.5841 20 6 7.3434 -8.6917 6.1747 21 6 5.3579 -8.3438 7.7160 22 6 4.2588 -9.2474 7.2195 23 1 4.1792 -9.4723 6.1662 24 6 3.3556 -9.7878 8.1101 25 7 3.4529 -9.5143 9.3927 26 14 1.9936 -10.9084 7.4947 27 1 2.5909 -12.0925 6.8266 28 1 1.1626 -11.3536 8.6421 29 1 1.1443 -10.1695 6.5262 30 6 4.3215 -2.1430 0.5392 31 1 -0.3633 0.0000 1.0277 32 1 -0.3633 0.8901 -0.5138 33 1 -0.3633 -0.8900 -0.5139 34 1 1.6988 -2.0056 0.0748 35 1 3.6353 0.5558 -1.3807 36 1 6.0873 0.5522 -1.5747 37 1 7.4149 -1.1657 -0.4180 38 1 7.2811 -3.4442 0.6917 39 1 6.7863 -5.6031 2.2721 40 1 7.8263 -4.4304 3.1157 41 1 5.7927 -3.0867 4.7662 42 1 5.7842 -4.2603 6.1041 43 1 7.3250 -3.7733 5.3572 44 1 6.6983 -7.0952 3.9827 45 1 7.7240 -6.1525 5.0905 46 1 8.2248 -8.3424 6.7124 47 1 7.1705 -9.7431 6.4044 48 1 7.5021 -8.5754 5.1026 49 1 5.9810 -8.8862 8.4269 50 1 4.9198 -7.4744 8.2063 51 1 2.8173 -9.8942 10.0192 52 1 3.8265 -2.8998 1.1296 RHF calculation, no. of doubly occupied orbitals= 71 REFERENCES FOR PARAMETERS IN GAS-PHASE HAMILTONIAN: H: (AM1): M.J.S. DEWAR ET AL, J. AM. CHEM. SOC. 107 3902-3909 (1985) C: (AM1): M.J.S. DEWAR ET AL, J. AM. CHEM. SOC. 107 3902-3909 (1985) N: (AM1): M.J.S. DEWAR ET AL, J. AM. CHEM. SOC. 107 3902-3909 (1985) O: (AM1): M.J.S. DEWAR ET AL, J. AM. CHEM. SOC. 107 3902-3909 (1985) Si: (AM1): M.J.S.DEWAR, C. JIE, ORGANOMETALLICS, 6, 1486-1490 (1987). REFERENCE FOR CHARGE MODEL 2: J. Li, J. Xing, C. J. Cramer, and D. G. Truhlar, J. Chem. Phys. 111 (1999) 885. REFERENCE FOR THE PARAMETERIZATION OF THE SM5.42R SOLVATION MODEL: J. Li, T. Zhu, G. D. Hawkins, P. Winget, D. A. Liotard, C. J. Cramer, and D. G. Truhlar, Theor. Chem. Acc. 103 (1999) 9-63 P. Winget, J. D. Thompson C. J. Cramer,and D. G. Truhlar, J. Phys. Chem. B. submitted. CHARGE=-1 AM1 1SCF TLIMIT=15 GEO-OK SM5.42R & SOLVNT=GENORG IOFR=1.4345 ALPHA=0.00 BETA=0.00 GAMMA=38.93 & DIELEC=2.06 FACARB=0.00 FEHALO=0.00 DEV ZINC000052897881.mol2 52 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED SCF FIELD WAS ACHIEVED Wall clock time and date at job start Tue Mar 31 2020 06:52:35 Heat of formation + Delta-G solvation = -46.073380 kcal Electronic energy + Delta-G solvation = -33649.221108 eV Core-core repulsion = 29036.042193 eV Total energy + Delta-G solvation = -4613.178915 eV No. of doubly occupied orbitals = 71 Molecular weight (most abundant/longest-lived isotopes) = 376.194 amu Computer time = 1.23 seconds Orbital eigenvalues (eV) -41.08340 -40.30773 -39.20871 -38.39971 -36.38258 -35.48748 -34.67443 -34.38928 -32.59719 -31.16876 -30.61371 -29.18595 -28.77536 -27.84395 -27.23102 -25.65058 -24.04213 -23.12602 -22.98478 -21.94302 -20.87270 -20.31404 -18.65887 -18.43990 -17.43742 -17.16316 -16.64905 -16.53511 -16.44557 -16.01549 -15.95835 -15.68808 -15.33012 -15.24743 -14.75431 -14.45729 -14.35211 -14.06468 -14.05253 -13.92188 -13.67131 -13.25010 -12.99771 -12.94592 -12.74780 -12.61953 -12.36448 -12.25603 -12.17372 -12.02533 -11.95031 -11.82478 -11.41825 -11.25613 -11.14857 -10.99287 -10.87402 -10.54803 -10.44740 -10.13682 -10.09649 -9.92200 -9.60982 -8.87771 -8.64925 -8.41240 -8.25310 -8.19517 -7.60635 -6.02110 -4.06676 0.94595 1.09875 2.21420 2.42243 2.54957 2.81449 3.33028 3.37800 3.39307 3.46786 3.58046 3.69080 4.22428 4.32617 4.42020 4.47460 4.67749 4.77732 4.85766 4.91492 4.97762 4.97787 5.01825 5.12592 5.18572 5.23335 5.31757 5.33927 5.36780 5.37332 5.43696 5.63745 5.69539 5.79365 5.90517 5.95204 5.96968 6.10311 6.16917 6.18129 6.28806 6.47951 6.77905 6.83924 6.96845 7.03515 7.10838 7.17110 7.46401 7.56689 7.74323 7.93699 7.94495 8.25666 8.43818 8.93106 9.15023 9.58259 11.05937 Molecular weight = 376.19amu Principal moments of inertia in cm(-1) A = 0.010094 B = 0.001788 C = 0.001584 Principal moments of inertia in units of 10**(-40)*gram-cm**2 A = 2773.283260 B =15659.907637 C =17675.352068 Net atomic charges, atomic populations, and dipole contributions calculated with CM2 Atom NO. Type Charge No. of electrons 1 C -0.172 4.172 2 C 0.512 3.488 3 O -0.527 6.527 4 N -0.673 5.673 5 C 0.164 3.836 6 C -0.139 4.139 7 C -0.082 4.082 8 C -0.163 4.163 9 C 0.171 3.829 10 N -0.679 5.679 11 C 0.512 3.488 12 O -0.487 6.487 13 C 0.038 3.962 14 N -0.505 5.505 15 C 0.015 3.985 16 C 0.038 3.962 17 C 0.505 3.495 18 O -0.518 6.518 19 N -0.606 5.606 20 C 0.084 3.916 21 C 0.247 3.753 22 C -0.525 4.525 23 H 0.056 0.944 24 C 0.060 3.940 25 N -0.895 5.895 26 Si 0.898 3.102 27 H -0.277 1.277 28 H -0.286 1.286 29 H -0.276 1.276 30 C -0.148 4.148 31 H 0.099 0.901 32 H 0.097 0.903 33 H 0.084 0.916 34 H 0.413 0.587 35 H 0.133 0.867 36 H 0.129 0.871 37 H 0.126 0.874 38 H 0.411 0.589 39 H 0.108 0.892 40 H 0.065 0.935 41 H 0.082 0.918 42 H 0.094 0.906 43 H 0.013 0.987 44 H 0.098 0.902 45 H 0.057 0.943 46 H 0.043 0.957 47 H 0.074 0.926 48 H 0.054 0.946 49 H 0.031 0.969 50 H 0.043 0.957 51 H 0.263 0.737 52 H 0.141 0.859 For the charges calculated by CM2: Dipole moment (debyes) X Y Z Total from point charges 8.180 14.240 -24.083 29.149 Note: The Mulliken population analysis charges presented below were not used in the solvation calculation but are provided for completeness. The chosen solvation model uses CM2 partial charges for calculating solvation energies. Net atomic charges, atomic populations, and dipole contributions using Mulliken population analysis Atom NO. Type Charge No. of electrons 1 C -0.232 4.232 2 C 0.300 3.700 3 O -0.402 6.402 4 N -0.319 5.319 5 C 0.070 3.930 6 C -0.160 4.160 7 C -0.101 4.101 8 C -0.184 4.184 9 C 0.076 3.924 10 N -0.326 5.326 11 C 0.299 3.701 12 O -0.358 6.358 13 C -0.093 4.093 14 N -0.229 5.229 15 C -0.133 4.133 16 C -0.093 4.093 17 C 0.290 3.710 18 O -0.393 6.393 19 N -0.339 5.339 20 C -0.060 4.060 21 C 0.128 3.872 22 C -0.564 4.564 23 H 0.075 0.925 24 C -0.142 4.142 25 N -0.534 5.534 26 Si 0.726 3.274 27 H -0.203 1.203 28 H -0.212 1.212 29 H -0.202 1.202 30 C -0.171 4.171 31 H 0.117 0.883 32 H 0.116 0.884 33 H 0.102 0.898 34 H 0.250 0.750 35 H 0.151 0.849 36 H 0.147 0.853 37 H 0.144 0.856 38 H 0.246 0.754 39 H 0.126 0.874 40 H 0.083 0.917 41 H 0.101 0.899 42 H 0.113 0.887 43 H 0.031 0.969 44 H 0.116 0.884 45 H 0.075 0.925 46 H 0.061 0.939 47 H 0.093 0.907 48 H 0.073 0.927 49 H 0.049 0.951 50 H 0.061 0.939 51 H 0.073 0.927 52 H 0.159 0.841 Dipole moment (debyes) X Y Z Total from point charges 6.707 15.519 -23.314 28.799 hybrid contribution 0.400 -1.350 -0.269 1.434 sum 7.107 14.169 -23.583 28.415 Atomic orbital electron populations 1.21905 0.90549 1.05273 1.05435 1.21027 0.90960 0.83048 0.74925 1.90745 1.70579 1.31203 1.47709 1.43666 1.05249 1.10160 1.72791 1.17523 0.82783 0.96761 0.95975 1.21076 0.94891 0.99999 0.99993 1.20783 0.93181 0.97581 0.98599 1.20856 0.99914 0.95379 1.02253 1.17365 0.90077 0.90131 0.94780 1.43578 1.27224 1.40429 1.21394 1.20827 0.85456 0.83791 0.80063 1.90753 1.25820 1.57509 1.61734 1.21975 0.96040 0.97229 0.94074 1.61285 1.55618 1.03425 1.02618 1.22733 0.98442 0.94262 0.97826 1.22084 0.96538 0.92792 0.97851 1.20038 0.85662 0.81616 0.83699 1.90667 1.27751 1.54457 1.66474 1.48165 1.28579 1.23296 1.33895 1.21618 0.88118 0.97588 0.98686 1.19266 0.89447 0.95797 0.82709 1.21391 1.12573 1.28424 0.94013 0.92532 1.24940 0.97661 0.96773 0.94799 1.69918 1.37209 1.44655 1.01667 0.86555 0.81906 0.80661 0.78270 1.20302 1.21207 1.20153 1.20867 0.92489 1.02044 1.01653 0.88267 0.88433 0.89755 0.75038 0.84931 0.85322 0.85615 0.75367 0.87416 0.91705 0.89942 0.88749 0.96874 0.88375 0.92470 0.93879 0.90722 0.92701 0.95066 0.93860 0.92688 0.84139 Number of geometries 1 Number of calculations of the screened coulomb radii 1 The total number of SCF iterations 13. Note: The number of geometries may not correspond to the number of cycles due to rejected geometry changes. In the following table subtotal= G_P + SS G_CDS. Atom Chem. CM2 G_P Area Sigma k SS G_CDS Subtotal M number symbol chg. (kcal) (Ang**2) cal/(Ang**2) (kcal) (kcal) value 1 C -0.17 -0.89 10.31 36.01 0.37 -0.52 16 2 C 0.51 4.89 7.68 -10.99 -0.08 4.81 16 3 O -0.53 -7.15 14.80 5.56 0.08 -7.07 16 4 N -0.67 -6.03 5.34 -9.88 -0.05 -6.08 16 5 C 0.16 1.81 6.27 -83.72 -0.52 1.29 16 6 C -0.14 -1.48 8.65 -39.36 -0.34 -1.82 16 7 C -0.08 -0.72 10.03 -39.64 -0.40 -1.12 16 8 C -0.16 -1.36 9.96 -39.36 -0.39 -1.75 16 9 C 0.17 1.73 6.27 -83.72 -0.53 1.20 16 10 N -0.68 -5.65 5.34 -9.88 -0.05 -5.70 16 11 C 0.51 5.90 7.29 -10.98 -0.08 5.82 16 12 O -0.49 -7.86 12.01 5.56 0.07 -7.79 16 13 C 0.04 0.38 5.45 -4.97 -0.03 0.35 16 14 N -0.51 -7.55 4.24 -245.82 -1.04 -8.59 16 15 C 0.01 0.23 8.85 60.07 0.53 0.76 16 16 C 0.04 0.55 4.00 -4.97 -0.02 0.53 16 17 C 0.50 10.43 7.37 -10.98 -0.08 10.35 16 18 O -0.52 -13.23 13.91 5.56 0.08 -13.15 16 19 N -0.61 -12.67 2.86 -182.96 -0.52 -13.19 16 20 C 0.08 1.26 10.24 59.84 0.61 1.88 16 21 C 0.25 6.48 5.16 -5.19 -0.03 6.45 16 22 C -0.53 -14.98 9.39 -34.44 -0.32 -15.30 16 23 H 0.06 1.61 7.81 -52.49 -0.41 1.20 16 24 C 0.06 1.74 5.46 -17.82 -0.10 1.64 16 25 N -0.90 -26.81 13.29 55.43 0.74 -26.07 16 26 Si 0.90 22.04 29.54 -169.99 -5.02 17.02 16 27 H -0.28 -6.56 7.11 56.52 0.40 -6.16 16 28 H -0.29 -6.91 7.11 56.52 0.40 -6.51 16 29 H -0.28 -6.83 7.11 56.52 0.40 -6.43 16 30 C -0.15 -1.72 8.57 -39.21 -0.34 -2.05 16 31 H 0.10 0.46 8.14 -51.93 -0.42 0.03 16 32 H 0.10 0.46 8.14 -51.93 -0.42 0.04 16 33 H 0.08 0.24 8.14 -51.93 -0.42 -0.19 16 34 H 0.41 2.55 8.82 -40.82 -0.36 2.19 16 35 H 0.13 1.47 6.43 -52.48 -0.34 1.13 16 36 H 0.13 0.81 8.06 -52.49 -0.42 0.39 16 37 H 0.13 0.72 8.06 -52.49 -0.42 0.29 16 38 H 0.41 1.81 8.82 -40.82 -0.36 1.45 16 39 H 0.11 0.79 7.93 -51.93 -0.41 0.38 16 40 H 0.07 0.47 8.12 -51.93 -0.42 0.05 16 41 H 0.08 1.37 5.88 -51.93 -0.31 1.07 16 42 H 0.09 1.81 5.82 -51.93 -0.30 1.51 16 43 H 0.01 0.17 8.14 -51.93 -0.42 -0.25 16 44 H 0.10 1.18 7.19 -51.93 -0.37 0.80 16 45 H 0.06 0.67 8.09 -51.93 -0.42 0.25 16 46 H 0.04 0.55 8.14 -51.93 -0.42 0.13 16 47 H 0.07 1.17 8.07 -51.93 -0.42 0.75 16 48 H 0.05 0.64 6.44 -51.93 -0.33 0.31 16 49 H 0.03 0.82 8.07 -51.93 -0.42 0.40 16 50 H 0.04 1.28 7.42 -51.93 -0.39 0.90 16 51 H 0.26 7.47 8.31 -40.82 -0.34 7.13 16 52 H 0.14 1.83 6.43 -52.49 -0.34 1.49 16 LS Contribution 430.06 15.07 6.48 6.48 Total: -1.00 -40.61 430.06 -8.68 -49.29 By element: Atomic # 1 Polarization: 10.04 SS G_CDS: -7.69 Total: 2.35 kcal Atomic # 6 Polarization: 14.25 SS G_CDS: -1.74 Total: 12.51 kcal Atomic # 7 Polarization: -58.71 SS G_CDS: -0.93 Total: -59.64 kcal Atomic # 8 Polarization: -28.24 SS G_CDS: 0.23 Total: -28.01 kcal Atomic # 14 Polarization: 22.04 SS G_CDS: -5.02 Total: 17.02 kcal Total LS contribution 6.48 Total: 6.48 kcal Total: -40.61 -8.68 -49.29 kcal The number of atoms in the molecule is 52 The average number of expansion shells was 16.00 The maximum number of expansion shells was 16 The minimum number of expansion shells was 16 **** NOTA BENE **** This is the net solvation energy for this exact molecular structure (nuclear and electronic)! The standard-state solvation energy should be obtained as the difference between the heat of formation plus delta-G solvation for the relaxed solvated system and that for the relaxed gas-phase system. ZINC000052897881.mol2 52 1SCF run This is a breakdown of the solvation energy calculated without geometric relaxation in solution: (1) E-EN(sol) electronic-nuclear energy of solute 3.219 kcal (2) G-P(sol) polarization free energy of solvation -40.613 kcal (3) G-ENP(sol) elect.-nuc.-pol. free energy of system -37.394 kcal (4) G-CDS(sol) cavity-dispersion-solvent structure free energy -8.679 kcal (5) G-P-CDS(sol) = G-P(sol) + G-CDS(sol) = (2) + (4) -49.292 kcal (6) G-S(sol) free energy of system = (1) + (5) -46.073 kcal 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED Total computer time = 1.23 seconds