Wall clock time and date at job start Sat Apr 11 2020 06:10:21 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 O 1.42900 * 1 3 3 C 1.42901 * 113.99991 * 2 1 4 4 C 1.52999 * 109.47553 * 180.02562 * 3 2 1 5 5 C 1.50707 * 110.43241 * 305.22842 * 4 3 2 6 6 O 1.21273 * 120.00257 * 122.61806 * 5 4 3 7 7 N 1.34776 * 119.99500 * 302.62052 * 5 4 3 8 8 C 1.47150 * 120.98596 * 354.74344 * 7 5 4 9 9 C 1.53301 * 108.38444 * 230.55996 * 8 7 5 10 10 O 1.42963 * 109.22223 * 307.69472 * 9 8 7 11 11 C 1.42966 * 114.16356 * 62.57936 * 10 9 8 12 12 H 1.08999 * 109.50823 * 57.34729 * 11 10 9 13 13 C 1.53006 * 109.50601 * 177.49818 * 11 10 9 14 14 H 1.09000 * 109.46442 * 175.00208 * 13 11 10 15 15 C 1.52993 * 109.47552 * 55.00219 * 13 11 10 16 16 N 1.46504 * 109.46917 * 294.99736 * 13 11 10 17 17 C 1.36939 * 119.99760 * 205.00115 * 16 13 11 18 18 H 1.07996 * 119.99927 * 0.02562 * 17 16 13 19 19 C 1.38810 * 119.99914 * 180.02562 * 17 16 13 20 20 N 1.31616 * 120.00098 * 359.97438 * 19 17 16 21 21 Si 1.86798 * 120.00220 * 180.02562 * 19 17 16 22 22 H 1.48506 * 109.47260 * 59.99498 * 21 19 17 23 23 H 1.48496 * 109.47343 * 180.02562 * 21 19 17 24 24 H 1.48502 * 109.46849 * 299.99712 * 21 19 17 25 25 C 1.47152 * 120.97975 * 174.76470 * 7 5 4 26 26 C 1.54886 * 110.59707 * 67.83861 * 4 3 2 27 27 C 1.54894 * 102.74702 * 156.68004 * 26 4 3 28 28 C 1.54262 * 104.19735 * 322.05985 * 27 26 4 29 29 C 1.53880 * 106.59665 * 23.60755 * 28 27 26 30 30 H 1.08998 * 109.47043 * 59.99555 * 1 2 3 31 31 H 1.08995 * 109.46888 * 180.02562 * 1 2 3 32 32 H 1.09006 * 109.46620 * 300.00183 * 1 2 3 33 33 H 1.08998 * 109.47485 * 60.00186 * 3 2 1 34 34 H 1.09003 * 109.47239 * 299.99892 * 3 2 1 35 35 H 1.08999 * 109.67871 * 350.27873 * 8 7 5 36 36 H 1.08993 * 109.68344 * 110.83422 * 8 7 5 37 37 H 1.08999 * 109.50948 * 187.77353 * 9 8 7 38 38 H 1.08995 * 109.51250 * 67.61991 * 9 8 7 39 39 H 1.09000 * 109.46938 * 299.99959 * 15 13 11 40 40 H 1.09006 * 109.47297 * 59.99474 * 15 13 11 41 41 H 1.08996 * 109.47456 * 179.97438 * 15 13 11 42 42 H 0.97002 * 119.99992 * 25.00623 * 16 13 11 43 43 H 0.96999 * 120.00257 * 179.97438 * 20 19 17 44 44 H 1.08995 * 109.68394 * 9.71991 * 25 7 5 45 45 H 1.08993 * 109.71549 * 249.18352 * 25 7 5 46 46 H 1.09001 * 110.76119 * 274.99202 * 26 4 3 47 47 H 1.09000 * 110.75857 * 38.36954 * 26 4 3 48 48 H 1.09003 * 110.48576 * 203.37707 * 27 26 4 49 49 H 1.09007 * 110.48498 * 80.73752 * 27 26 4 50 50 H 1.08996 * 110.03607 * 264.32499 * 28 27 26 51 51 H 1.08998 * 110.03574 * 142.89212 * 28 27 26 52 52 H 1.09001 * 110.03281 * 240.71572 * 29 28 27 53 53 H 1.09007 * 110.03027 * 119.28667 * 29 28 27 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 8 1.4290 0.0000 0.0000 3 6 2.0102 1.3055 0.0000 4 6 3.5354 1.1848 -0.0006 5 6 3.9961 0.3310 1.1526 6 8 4.6621 -0.6610 0.9447 7 7 3.6680 0.6699 2.4151 8 6 2.9600 1.9275 2.7022 9 6 3.7168 2.6659 3.8123 10 8 3.9123 1.7807 4.9178 11 6 4.7132 0.6356 4.6161 12 1 5.6846 0.9591 4.2421 13 6 4.9049 -0.2018 5.8823 14 1 5.4395 -1.1186 5.6340 15 6 3.5381 -0.5526 6.4736 16 7 5.6787 0.5647 6.8621 17 6 6.4072 -0.0876 7.8208 18 1 6.4116 -1.1670 7.8543 19 6 7.1400 0.6386 8.7494 20 7 7.1351 1.9541 8.7083 21 14 8.1343 -0.2511 10.0567 22 1 9.1450 -1.1211 9.4033 23 1 8.8205 0.7439 10.9194 24 1 7.2273 -1.0836 10.8872 25 6 4.0074 -0.2067 3.5473 26 6 4.0349 0.5968 -1.3437 27 6 5.4981 1.1003 -1.4141 28 6 5.4356 2.5274 -0.8317 29 6 4.1876 2.5811 0.0670 30 1 -0.3633 0.5139 -0.8899 31 1 -0.3633 -1.0276 0.0005 32 1 -0.3633 0.5139 0.8900 33 1 1.6887 1.8464 0.8900 34 1 1.6886 1.8464 -0.8900 35 1 2.9304 2.5452 1.8046 36 1 1.9444 1.7100 3.0324 37 1 3.1366 3.5300 4.1359 38 1 4.6845 2.9967 3.4353 39 1 3.0035 0.3643 6.7218 40 1 2.9623 -1.1228 5.7445 41 1 3.6747 -1.1494 7.3753 42 1 5.6750 1.5343 6.8318 43 1 7.6468 2.4616 9.3574 44 1 4.6714 -1.0023 3.2094 45 1 3.0976 -0.6397 3.9628 46 1 4.0018 -0.4925 -1.3247 47 1 3.4515 0.9877 -2.1773 48 1 5.8438 1.1248 -2.4475 49 1 6.1483 0.4691 -0.8082 50 1 5.3470 3.2560 -1.6375 51 1 6.3295 2.7294 -0.2417 52 1 3.4934 3.3358 -0.3027 53 1 4.4760 2.8092 1.0932 RHF calculation, no. of doubly occupied orbitals= 66 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 ZINC001725322195.mol2 53 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED SCF FIELD WAS ACHIEVED Wall clock time and date at job start Sat Apr 11 2020 06:10:21 Heat of formation + Delta-G solvation = -104.112167 kcal Electronic energy + Delta-G solvation = -32453.326235 eV Core-core repulsion = 28325.849334 eV Total energy + Delta-G solvation = -4127.476901 eV No. of doubly occupied orbitals = 66 Molecular weight (most abundant/longest-lived isotopes) = 340.220 amu Computer time = 0.72 seconds Orbital eigenvalues (eV) -41.17910 -39.04436 -37.85203 -36.91934 -35.54245 -34.54928 -32.53028 -31.28048 -30.20014 -28.96927 -28.46001 -27.28404 -26.87115 -24.77831 -24.72385 -23.42189 -22.96017 -21.10704 -20.75858 -19.60953 -18.87128 -17.39682 -17.11552 -16.63312 -16.36228 -16.02425 -15.90646 -15.78389 -15.36994 -15.09820 -14.88271 -14.45137 -14.26291 -14.10921 -13.65240 -13.54620 -13.31714 -13.08580 -12.94818 -12.76457 -12.40116 -12.17108 -12.03182 -11.84474 -11.71526 -11.51689 -11.31680 -11.22588 -11.17505 -11.10423 -11.03380 -10.80476 -10.69878 -10.63374 -10.47046 -10.25601 -10.00791 -9.96818 -9.78186 -9.63657 -9.49852 -8.86085 -8.39692 -6.90257 -5.70616 -2.99169 2.64029 2.85185 3.33645 3.47807 3.51971 3.52980 3.98359 4.07641 4.27274 4.36892 4.60130 4.63285 4.70560 4.80492 4.82641 4.93707 5.01724 5.04590 5.08911 5.14309 5.17388 5.20312 5.26870 5.31822 5.37649 5.39238 5.43467 5.51396 5.52569 5.62224 5.68463 5.70417 5.74212 5.77511 5.87991 5.95551 6.02179 6.05383 6.07453 6.22611 6.25870 6.45215 6.50250 6.69296 6.78641 6.86103 7.19133 7.37953 7.50240 7.74322 8.19226 8.47733 9.59465 10.17306 10.54149 11.51848 Molecular weight = 340.22amu Principal moments of inertia in cm(-1) A = 0.017240 B = 0.002863 C = 0.002719 Principal moments of inertia in units of 10**(-40)*gram-cm**2 A = 1623.720254 B = 9777.446942 C =10295.797710 Net atomic charges, atomic populations, and dipole contributions calculated with CM2 Atom NO. Type Charge No. of electrons 1 C 0.032 3.968 2 O -0.381 6.381 3 C 0.067 3.933 4 C -0.083 4.083 5 C 0.542 3.458 6 O -0.532 6.532 7 N -0.610 5.610 8 C 0.061 3.939 9 C 0.045 3.955 10 O -0.357 6.357 11 C 0.077 3.923 12 H 0.063 0.937 13 C 0.185 3.815 14 H 0.059 0.941 15 C -0.162 4.162 16 N -0.719 5.719 17 C -0.239 4.239 18 H 0.070 0.930 19 C -0.013 4.013 20 N -0.932 5.932 21 Si 0.906 3.094 22 H -0.286 1.286 23 H -0.292 1.292 24 H -0.286 1.286 25 C 0.085 3.915 26 C -0.093 4.093 27 C -0.127 4.127 28 C -0.123 4.123 29 C -0.119 4.119 30 H 0.040 0.960 31 H 0.086 0.914 32 H 0.041 0.959 33 H 0.061 0.939 34 H 0.059 0.941 35 H 0.098 0.902 36 H 0.074 0.926 37 H 0.103 0.897 38 H 0.053 0.947 39 H 0.056 0.944 40 H 0.034 0.966 41 H 0.052 0.948 42 H 0.389 0.611 43 H 0.255 0.745 44 H 0.099 0.901 45 H 0.079 0.921 46 H 0.083 0.917 47 H 0.070 0.930 48 H 0.066 0.934 49 H 0.074 0.926 50 H 0.067 0.933 51 H 0.067 0.933 52 H 0.078 0.922 53 H 0.077 0.923 For the charges calculated by CM2: Dipole moment (debyes) X Y Z Total from point charges -13.533 3.377 -22.929 26.839 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 -0.064 4.064 2 O -0.300 6.300 3 C -0.010 4.010 4 C -0.086 4.086 5 C 0.330 3.670 6 O -0.408 6.408 7 N -0.344 5.344 8 C -0.062 4.062 9 C -0.033 4.033 10 O -0.275 6.275 11 C 0.017 3.983 12 H 0.081 0.919 13 C 0.074 3.926 14 H 0.077 0.923 15 C -0.222 4.222 16 N -0.361 5.361 17 C -0.370 4.370 18 H 0.088 0.912 19 C -0.209 4.209 20 N -0.580 5.580 21 Si 0.737 3.263 22 H -0.213 1.213 23 H -0.218 1.218 24 H -0.213 1.213 25 C -0.038 4.038 26 C -0.131 4.131 27 C -0.164 4.164 28 C -0.161 4.161 29 C -0.157 4.157 30 H 0.059 0.941 31 H 0.105 0.895 32 H 0.060 0.940 33 H 0.079 0.921 34 H 0.077 0.923 35 H 0.115 0.885 36 H 0.093 0.907 37 H 0.121 0.879 38 H 0.071 0.929 39 H 0.075 0.925 40 H 0.053 0.947 41 H 0.071 0.929 42 H 0.223 0.777 43 H 0.064 0.936 44 H 0.117 0.883 45 H 0.097 0.903 46 H 0.102 0.898 47 H 0.089 0.911 48 H 0.085 0.915 49 H 0.093 0.907 50 H 0.086 0.914 51 H 0.086 0.914 52 H 0.097 0.903 53 H 0.096 0.904 Dipole moment (debyes) X Y Z Total from point charges -13.026 2.593 -22.733 26.329 hybrid contribution 0.237 0.213 0.594 0.675 sum -12.789 2.805 -22.138 25.720 Atomic orbital electron populations 1.22748 0.80857 1.02981 0.99863 1.87975 1.19700 1.26978 1.95339 1.22832 0.91305 0.85719 1.01150 1.21672 0.94229 0.96632 0.96048 1.20008 0.78873 0.85202 0.82899 1.90658 1.38460 1.27614 1.84027 1.48013 1.58254 1.21776 1.06366 1.22836 0.96860 0.86220 1.00283 1.22916 0.99552 0.93064 0.87757 1.88101 1.71652 1.34552 1.33221 1.22974 0.92836 0.86471 0.95985 0.91933 1.20195 0.92241 0.93094 0.87054 0.92325 1.22406 0.98576 1.00976 1.00206 1.42347 1.54746 1.05937 1.33026 1.19213 1.20576 0.91169 1.06047 0.91229 1.24727 1.01030 0.95452 0.99698 1.69666 1.45738 1.04255 1.38345 0.86284 0.80027 0.78307 0.81664 1.21294 1.21757 1.21306 1.22447 1.01583 0.93841 0.85923 1.22343 0.95491 1.02011 0.93241 1.22399 0.97192 0.95838 1.00999 1.22131 0.97434 0.97740 0.98795 1.22390 0.97744 0.94021 1.01518 0.94094 0.89509 0.94004 0.92084 0.92260 0.88451 0.90743 0.87943 0.92897 0.92491 0.94672 0.92935 0.77696 0.93552 0.88290 0.90294 0.89827 0.91090 0.91494 0.90697 0.91423 0.91421 0.90332 0.90419 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 0.03 0.24 11.01 101.05 1.11 1.35 16 2 O -0.38 -4.13 10.09 -35.23 -0.36 -4.49 16 3 C 0.07 0.58 4.38 37.16 0.16 0.74 16 4 C -0.08 -0.85 0.35 -154.00 -0.05 -0.90 16 5 C 0.54 7.66 5.83 -10.98 -0.06 7.60 16 6 O -0.53 -9.42 14.53 5.56 0.08 -9.34 16 7 N -0.61 -8.23 3.01 -172.28 -0.52 -8.75 16 8 C 0.06 0.64 4.13 -3.53 -0.01 0.63 16 9 C 0.05 0.56 6.93 37.31 0.26 0.82 16 10 O -0.36 -6.10 9.24 -35.23 -0.33 -6.42 16 11 C 0.08 1.35 2.61 -26.58 -0.07 1.28 16 12 H 0.06 1.20 8.14 -51.93 -0.42 0.78 16 13 C 0.18 3.80 2.77 -67.93 -0.19 3.61 16 14 H 0.06 1.21 8.08 -51.93 -0.42 0.79 16 15 C -0.16 -3.05 9.06 37.15 0.34 -2.71 16 16 N -0.72 -18.52 5.10 -53.42 -0.27 -18.80 16 17 C -0.24 -6.75 9.93 -15.06 -0.15 -6.89 16 18 H 0.07 1.90 7.83 -52.49 -0.41 1.49 16 19 C -0.01 -0.38 5.50 -17.43 -0.10 -0.48 16 20 N -0.93 -28.58 13.06 55.49 0.72 -27.85 16 21 Si 0.91 22.73 29.55 -169.99 -5.02 17.70 16 22 H -0.29 -7.06 7.11 56.52 0.40 -6.66 16 23 H -0.29 -7.36 7.11 56.52 0.40 -6.96 16 24 H -0.29 -7.07 7.11 56.52 0.40 -6.66 16 25 C 0.08 1.30 5.84 -3.53 -0.02 1.28 16 26 C -0.09 -0.95 5.39 -24.74 -0.13 -1.08 16 27 C -0.13 -1.24 6.52 -25.07 -0.16 -1.41 16 28 C -0.12 -1.04 6.80 -25.61 -0.17 -1.21 16 29 C -0.12 -0.97 4.58 -25.61 -0.12 -1.09 16 30 H 0.04 0.23 8.14 -51.93 -0.42 -0.19 16 31 H 0.09 0.59 8.14 -51.93 -0.42 0.17 16 32 H 0.04 0.28 8.14 -51.93 -0.42 -0.15 16 33 H 0.06 0.46 5.10 -51.93 -0.26 0.20 16 34 H 0.06 0.39 8.07 -51.93 -0.42 -0.03 16 35 H 0.10 0.77 3.25 -51.93 -0.17 0.60 16 36 H 0.07 0.74 8.05 -51.93 -0.42 0.32 16 37 H 0.10 1.02 8.14 -51.93 -0.42 0.60 16 38 H 0.05 0.66 8.00 -51.93 -0.42 0.24 16 39 H 0.06 1.12 7.56 -51.93 -0.39 0.73 16 40 H 0.03 0.56 6.41 -51.93 -0.33 0.22 16 41 H 0.05 1.05 8.14 -51.93 -0.42 0.63 16 42 H 0.39 10.77 7.58 -40.82 -0.31 10.46 16 43 H 0.25 7.57 8.31 -40.82 -0.34 7.23 16 44 H 0.10 1.64 7.06 -51.93 -0.37 1.27 16 45 H 0.08 1.18 6.26 -51.93 -0.33 0.85 16 46 H 0.08 1.05 7.43 -51.93 -0.39 0.67 16 47 H 0.07 0.58 8.01 -51.93 -0.42 0.17 16 48 H 0.07 0.55 8.14 -51.93 -0.42 0.13 16 49 H 0.07 0.92 7.60 -51.92 -0.39 0.53 16 50 H 0.07 0.45 8.14 -51.93 -0.42 0.03 16 51 H 0.07 0.61 8.14 -51.93 -0.42 0.19 16 52 H 0.08 0.45 7.84 -51.93 -0.41 0.04 16 53 H 0.08 0.69 5.80 -51.92 -0.30 0.39 16 LS Contribution 399.07 15.07 6.01 6.01 Total: -1.00 -34.21 399.07 -8.14 -42.35 By element: Atomic # 1 Polarization: 17.15 SS G_CDS: -9.09 Total: 8.06 kcal Atomic # 6 Polarization: 0.90 SS G_CDS: 0.63 Total: 1.52 kcal Atomic # 7 Polarization: -55.34 SS G_CDS: -0.07 Total: -55.40 kcal Atomic # 8 Polarization: -19.65 SS G_CDS: -0.60 Total: -20.25 kcal Atomic # 14 Polarization: 22.73 SS G_CDS: -5.02 Total: 17.70 kcal Total LS contribution 6.01 Total: 6.01 kcal Total: -34.21 -8.14 -42.35 kcal The number of atoms in the molecule is 53 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. ZINC001725322195.mol2 53 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 -61.763 kcal (2) G-P(sol) polarization free energy of solvation -34.210 kcal (3) G-ENP(sol) elect.-nuc.-pol. free energy of system -95.973 kcal (4) G-CDS(sol) cavity-dispersion-solvent structure free energy -8.139 kcal (5) G-P-CDS(sol) = G-P(sol) + G-CDS(sol) = (2) + (4) -42.349 kcal (6) G-S(sol) free energy of system = (1) + (5) -104.112 kcal 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED Total computer time = 0.72 seconds