Wall clock time and date at job start Tue Mar 31 2020 05:49:38 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 N 2 2 C 1.31526 * 1 3 3 Si 1.86797 * 119.99722 * 2 1 4 4 H 1.48505 * 109.46938 * 239.99853 * 3 2 1 5 5 H 1.48495 * 109.47549 * 0.02562 * 3 2 1 6 6 H 1.48497 * 109.47218 * 120.00562 * 3 2 1 7 7 C 1.37874 * 120.00090 * 180.02562 * 2 1 3 8 8 H 1.07997 * 120.00418 * 180.02562 * 7 2 1 9 9 C 1.50709 * 119.99688 * 359.97438 * 7 2 1 10 10 C 1.53006 * 109.46804 * 179.97438 * 9 7 2 11 11 C 1.53001 * 109.46814 * 179.97438 * 10 9 7 12 12 S 1.81404 * 109.46725 * 180.02562 * 11 10 9 13 13 O 1.42101 * 110.54314 * 68.37748 * 12 11 10 14 14 O 1.42096 * 110.54107 * 291.62718 * 12 11 10 15 15 N 1.65605 * 104.44566 * 180.02562 * 12 11 10 16 16 C 1.47017 * 125.64843 * 89.98082 * 15 12 11 17 17 C 1.54323 * 107.27048 * 178.97301 * 16 15 12 18 18 C 1.55155 * 102.94054 * 337.80261 * 17 16 15 19 19 H 1.08997 * 111.00144 * 277.38975 * 18 17 16 20 20 C 1.53007 * 111.00137 * 153.57830 * 18 17 16 21 21 N 1.46898 * 109.47029 * 62.67191 * 20 18 17 22 22 C 1.46842 * 111.00032 * 176.18431 * 21 20 18 23 23 C 1.53032 * 109.51882 * 174.15559 * 22 21 20 24 24 C 1.53122 * 109.27765 * 59.18563 * 23 22 21 25 25 C 1.53119 * 109.16115 * 302.34898 * 24 23 22 26 26 C 1.46850 * 110.99139 * 51.98216 * 21 20 18 27 27 C 1.47460 * 125.62696 * 269.97174 * 15 12 11 28 28 H 0.97001 * 119.99750 * 359.97438 * 1 2 3 29 29 H 1.08997 * 109.46753 * 60.00102 * 9 7 2 30 30 H 1.08998 * 109.47146 * 299.99795 * 9 7 2 31 31 H 1.09007 * 109.46773 * 60.00255 * 10 9 7 32 32 H 1.08996 * 109.47139 * 300.00715 * 10 9 7 33 33 H 1.08997 * 109.46635 * 60.00432 * 11 10 9 34 34 H 1.08998 * 109.47254 * 300.00130 * 11 10 9 35 35 H 1.09000 * 109.88664 * 59.54912 * 16 15 12 36 36 H 1.09004 * 110.00801 * 298.45945 * 16 15 12 37 37 H 1.09006 * 110.71632 * 219.43873 * 17 16 15 38 38 H 1.09001 * 110.87420 * 96.24021 * 17 16 15 39 39 H 1.08996 * 109.46967 * 302.67251 * 20 18 17 40 40 H 1.08999 * 109.46823 * 182.67158 * 20 18 17 41 41 H 1.09001 * 109.46145 * 54.14466 * 22 21 20 42 42 H 1.09007 * 109.46511 * 294.16925 * 22 21 20 43 43 H 1.08999 * 109.50517 * 179.12778 * 23 22 21 44 44 H 1.08999 * 109.50389 * 299.20981 * 23 22 21 45 45 H 1.09008 * 109.52299 * 62.25285 * 24 23 22 46 46 H 1.08995 * 109.52462 * 182.37772 * 24 23 22 47 47 H 1.08997 * 109.50393 * 177.59151 * 25 24 23 48 48 H 1.09000 * 109.50038 * 297.71285 * 25 24 23 49 49 H 1.09004 * 109.46886 * 65.83243 * 26 21 20 50 50 H 1.08996 * 109.45765 * 305.85593 * 26 21 20 51 51 H 1.09003 * 110.34838 * 85.25685 * 27 15 12 52 52 H 1.09002 * 110.41232 * 322.92518 * 27 15 12 Note: An asterisk (*) indicates this parameter was or will be optimized. Cartesian coordinates (angstroms) NO. Atom X Y Z 1 7 0.0000 0.0000 0.0000 2 6 1.3153 0.0000 0.0000 3 14 2.2492 1.6178 0.0000 4 1 3.1030 1.6964 -1.2125 5 1 1.2842 2.7465 0.0006 6 1 3.1030 1.6964 1.2124 7 6 2.0046 -1.1940 -0.0005 8 1 3.0846 -1.1941 -0.0001 9 6 1.2510 -2.4992 -0.0005 10 6 2.2453 -3.6621 -0.0018 11 6 1.4803 -4.9871 -0.0012 12 16 2.6592 -6.3659 -0.0019 13 8 3.3568 -6.4262 1.2346 14 8 3.3550 -6.4262 -1.2394 15 7 1.7087 -7.7221 -0.0019 16 6 1.2162 -8.4232 -1.1965 17 6 0.3977 -9.6377 -0.7101 18 6 0.9463 -9.8755 0.7216 19 1 1.8682 -10.4564 0.6953 20 6 -0.1019 -10.5556 1.6047 21 7 -0.4214 -11.8795 1.0541 22 6 -1.3582 -12.5998 1.9258 23 6 -1.7803 -13.9077 1.2527 24 6 -0.5387 -14.7640 0.9884 25 6 0.4420 -13.9723 0.1188 26 6 0.7996 -12.6625 0.8249 27 6 1.2167 -8.4261 1.1967 28 1 -0.4850 0.8401 0.0004 29 1 0.6241 -2.5566 -0.8903 30 1 0.6248 -2.5571 0.8897 31 1 2.8727 -3.6047 0.8878 32 1 2.8714 -3.6039 -0.8922 33 1 0.8527 -5.0446 -0.8905 34 1 0.8546 -5.0450 0.8895 35 1 2.0576 -8.7614 -1.8013 36 1 0.5813 -7.7594 -1.7834 37 1 0.5825 -10.5058 -1.3430 38 1 -0.6662 -9.4027 -0.6813 39 1 -1.0050 -9.9458 1.6318 40 1 0.2915 -10.6675 2.6150 41 1 -2.2384 -11.9817 2.1024 42 1 -0.8730 -12.8208 2.8766 43 1 -2.4636 -14.4496 1.9066 44 1 -2.2784 -13.6869 0.3086 45 1 -0.0627 -15.0176 1.9357 46 1 -0.8299 -15.6780 0.4710 47 1 1.3464 -14.5603 -0.0373 48 1 -0.0206 -13.7525 -0.8434 49 1 1.2746 -12.8832 1.7808 50 1 1.4865 -12.0899 0.2018 51 1 0.2956 -7.9663 1.5550 52 1 1.9748 -8.4187 1.9799 RHF calculation, no. of doubly occupied orbitals= 64 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). S: (AM1): M.J.S. DEWAR, Y.-C. YUAN, INORGANIC CHEM., 29, 589 (1990) 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 ZINC000096428573.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 05:49:38 Heat of formation + Delta-G solvation = -90.647463 kcal Electronic energy + Delta-G solvation = -28468.713749 eV Core-core repulsion = 24594.117541 eV Total energy + Delta-G solvation = -3874.596208 eV No. of doubly occupied orbitals = 64 Molecular weight (most abundant/longest-lived isotopes) = 344.192 amu Computer time = 1.21 seconds Orbital eigenvalues (eV) -39.88053 -38.27402 -36.89705 -35.73533 -34.65770 -34.33734 -32.17615 -31.48259 -30.79703 -29.53707 -27.79304 -26.10567 -23.83043 -23.61457 -23.11855 -22.31734 -20.54618 -20.47810 -19.88604 -18.79907 -17.59106 -16.95858 -16.59655 -16.04963 -15.78748 -15.48683 -15.33435 -14.83549 -14.67743 -14.48072 -14.37020 -14.07091 -13.76559 -13.64561 -13.51858 -13.29260 -12.94231 -12.57084 -12.51654 -12.27484 -12.02501 -11.92425 -11.86100 -11.76278 -11.62260 -11.51823 -11.32065 -11.26402 -11.21394 -11.05810 -10.94298 -10.89189 -10.86718 -10.74429 -10.51737 -10.42724 -9.94329 -9.49158 -9.22552 -8.88367 -8.67055 -8.40074 -6.05199 -4.08398 0.42898 2.77314 3.32440 3.36207 3.39491 3.44019 4.02028 4.13027 4.29091 4.37660 4.42748 4.43959 4.50631 4.58181 4.61108 4.83194 4.98789 5.02620 5.05322 5.10104 5.14543 5.17337 5.20875 5.23307 5.31012 5.32377 5.34211 5.37535 5.45383 5.49389 5.53315 5.57539 5.67730 5.71581 5.74501 5.77452 5.85500 5.90491 5.97076 5.99228 6.10333 6.23394 6.36878 6.45697 6.70276 6.72692 6.87647 7.57096 7.67260 7.92628 8.33103 8.97545 9.56172 11.05931 Molecular weight = 344.19amu Principal moments of inertia in cm(-1) A = 0.026122 B = 0.001883 C = 0.001820 Principal moments of inertia in units of 10**(-40)*gram-cm**2 A = 1071.646368 B =14863.521953 C =15378.142580 Net atomic charges, atomic populations, and dipole contributions calculated with CM2 Atom NO. Type Charge No. of electrons 1 N -0.895 5.895 2 C 0.058 3.942 3 Si 0.895 3.105 4 H -0.276 1.276 5 H -0.287 1.287 6 H -0.276 1.276 7 C -0.527 4.527 8 H 0.058 0.942 9 C 0.031 3.969 10 C -0.106 4.106 11 C -0.608 4.608 12 S 2.614 3.386 13 O -0.959 6.959 14 O -0.958 6.958 15 N -1.017 6.017 16 C 0.116 3.884 17 C -0.108 4.108 18 C -0.100 4.100 19 H 0.086 0.914 20 C 0.065 3.935 21 N -0.533 5.533 22 C 0.055 3.945 23 C -0.116 4.116 24 C -0.122 4.122 25 C -0.117 4.117 26 C 0.048 3.952 27 C 0.121 3.879 28 H 0.262 0.738 29 H 0.020 0.980 30 H 0.020 0.980 31 H 0.065 0.935 32 H 0.065 0.935 33 H 0.127 0.873 34 H 0.126 0.874 35 H 0.070 0.930 36 H 0.066 0.934 37 H 0.080 0.920 38 H 0.079 0.921 39 H 0.082 0.918 40 H 0.037 0.963 41 H 0.075 0.925 42 H 0.031 0.969 43 H 0.064 0.936 44 H 0.071 0.929 45 H 0.057 0.943 46 H 0.062 0.938 47 H 0.064 0.936 48 H 0.071 0.929 49 H 0.031 0.969 50 H 0.082 0.918 51 H 0.068 0.932 52 H 0.083 0.917 For the charges calculated by CM2: Dipole moment (debyes) X Y Z Total from point charges -3.998 -30.693 2.061 31.021 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 N -0.534 5.534 2 C -0.144 4.144 3 Si 0.723 3.277 4 H -0.201 1.201 5 H -0.212 1.212 6 H -0.201 1.201 7 C -0.565 4.565 8 H 0.076 0.924 9 C -0.007 4.007 10 C -0.146 4.146 11 C -0.740 4.740 12 S 2.713 3.287 13 O -0.950 6.950 14 O -0.948 6.948 15 N -0.854 5.854 16 C -0.009 4.009 17 C -0.147 4.147 18 C -0.121 4.121 19 H 0.104 0.896 20 C -0.063 4.063 21 N -0.258 5.258 22 C -0.073 4.073 23 C -0.154 4.154 24 C -0.160 4.160 25 C -0.155 4.155 26 C -0.080 4.080 27 C -0.005 4.005 28 H 0.072 0.928 29 H 0.039 0.961 30 H 0.039 0.961 31 H 0.084 0.916 32 H 0.084 0.916 33 H 0.145 0.855 34 H 0.145 0.855 35 H 0.088 0.912 36 H 0.084 0.916 37 H 0.099 0.901 38 H 0.097 0.903 39 H 0.100 0.900 40 H 0.055 0.945 41 H 0.093 0.907 42 H 0.050 0.950 43 H 0.083 0.917 44 H 0.090 0.910 45 H 0.075 0.925 46 H 0.081 0.919 47 H 0.083 0.917 48 H 0.090 0.910 49 H 0.049 0.951 50 H 0.100 0.900 51 H 0.086 0.914 52 H 0.101 0.899 Dipole moment (debyes) X Y Z Total from point charges -3.370 -30.455 1.602 30.683 hybrid contribution 0.047 1.096 0.826 1.373 sum -3.323 -29.359 2.428 29.646 Atomic orbital electron populations 1.69954 1.06078 1.26876 1.50519 1.25023 0.94901 0.99363 0.95094 0.86605 0.79560 0.82799 0.78759 1.20112 1.21241 1.20133 1.21222 0.93226 0.90908 1.51178 0.92412 1.19059 0.93520 0.90423 0.97721 1.21508 0.99406 0.91725 1.01917 1.30586 1.16445 1.15795 1.11144 1.04987 0.75313 0.74377 0.74064 1.93553 1.70103 1.85833 1.45484 1.93557 1.70152 1.85782 1.45335 1.58762 1.70394 1.43537 1.12684 1.21754 0.98034 0.94124 0.87010 1.22537 0.99879 0.96943 0.95321 1.22463 0.98710 0.95108 0.95787 0.89587 1.22055 0.98631 0.89969 0.95669 1.61953 1.13732 1.02688 1.47439 1.22077 0.96253 0.95240 0.93691 1.21573 0.97471 0.94967 1.01406 1.21584 0.96292 0.98271 0.99840 1.21584 0.99154 0.95232 0.99512 1.22215 0.91813 0.94588 0.99370 1.21996 0.99591 0.91257 0.87647 0.92848 0.96121 0.96133 0.91617 0.91590 0.85491 0.85519 0.91203 0.91589 0.90121 0.90270 0.90004 0.94481 0.90702 0.95035 0.91706 0.91016 0.92455 0.91918 0.91698 0.91018 0.95081 0.90000 0.91365 0.89871 Number of geometries 1 Number of calculations of the screened coulomb radii 1 The total number of SCF iterations 16. 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 N -0.90 -26.71 13.29 55.43 0.74 -25.97 16 2 C 0.06 1.66 5.46 -17.82 -0.10 1.56 16 3 Si 0.90 21.72 29.54 -169.99 -5.02 16.69 16 4 H -0.28 -6.57 7.11 56.52 0.40 -6.17 16 5 H -0.29 -6.85 7.11 56.52 0.40 -6.45 16 6 H -0.28 -6.58 7.11 56.52 0.40 -6.17 16 7 C -0.53 -14.98 9.11 -34.44 -0.31 -15.30 16 8 H 0.06 1.59 7.74 -52.49 -0.41 1.18 16 9 C 0.03 0.80 4.97 -27.88 -0.14 0.66 16 10 C -0.11 -2.19 5.16 -26.73 -0.14 -2.33 16 11 C -0.61 -9.65 6.18 37.16 0.23 -9.42 16 12 S 2.61 40.17 5.65 -107.50 -0.61 39.57 16 13 O -0.96 -17.21 17.28 -57.54 -0.99 -18.20 16 14 O -0.96 -17.35 17.60 -57.54 -1.01 -18.36 16 15 N -1.02 -12.00 3.62 -111.40 -0.40 -12.40 16 16 C 0.12 1.15 6.89 -3.07 -0.02 1.13 16 17 C -0.11 -0.83 6.14 -24.90 -0.15 -0.98 16 18 C -0.10 -0.78 2.41 -88.47 -0.21 -1.00 16 19 H 0.09 0.69 6.35 -51.93 -0.33 0.36 16 20 C 0.06 0.44 4.60 -3.82 -0.02 0.43 16 21 N -0.53 -3.64 4.49 -234.67 -1.05 -4.70 16 22 C 0.06 0.34 5.46 -3.84 -0.02 0.32 16 23 C -0.12 -0.64 6.09 -26.65 -0.16 -0.80 16 24 C -0.12 -0.66 6.00 -26.61 -0.16 -0.82 16 25 C -0.12 -0.67 6.09 -26.65 -0.16 -0.84 16 26 C 0.05 0.31 5.06 -3.83 -0.02 0.29 16 27 C 0.12 1.17 6.54 -2.51 -0.02 1.16 16 28 H 0.26 7.38 8.31 -40.82 -0.34 7.04 16 29 H 0.02 0.55 8.14 -51.93 -0.42 0.12 16 30 H 0.02 0.54 8.14 -51.93 -0.42 0.12 16 31 H 0.07 1.33 8.14 -51.92 -0.42 0.90 16 32 H 0.07 1.33 8.14 -51.93 -0.42 0.91 16 33 H 0.13 1.82 8.14 -51.93 -0.42 1.40 16 34 H 0.13 1.81 8.14 -51.92 -0.42 1.39 16 35 H 0.07 0.72 8.14 -51.93 -0.42 0.30 16 36 H 0.07 0.60 8.14 -51.93 -0.42 0.18 16 37 H 0.08 0.57 8.11 -51.93 -0.42 0.15 16 38 H 0.08 0.59 8.04 -51.93 -0.42 0.17 16 39 H 0.08 0.54 8.12 -51.93 -0.42 0.12 16 40 H 0.04 0.25 8.14 -51.93 -0.42 -0.17 16 41 H 0.07 0.44 8.12 -51.93 -0.42 0.02 16 42 H 0.03 0.20 8.14 -51.93 -0.42 -0.22 16 43 H 0.06 0.30 8.14 -51.93 -0.42 -0.12 16 44 H 0.07 0.43 8.14 -51.93 -0.42 0.01 16 45 H 0.06 0.32 8.14 -51.92 -0.42 -0.11 16 46 H 0.06 0.30 8.14 -51.93 -0.42 -0.12 16 47 H 0.06 0.33 8.14 -51.93 -0.42 -0.09 16 48 H 0.07 0.45 8.14 -51.93 -0.42 0.03 16 49 H 0.03 0.22 8.14 -51.93 -0.42 -0.21 16 50 H 0.08 0.54 5.81 -51.93 -0.30 0.24 16 51 H 0.07 0.57 8.02 -51.93 -0.42 0.15 16 52 H 0.08 0.85 7.67 -51.93 -0.40 0.45 16 LS Contribution 413.67 15.07 6.23 6.23 Total: -1.00 -34.29 413.67 -13.38 -47.68 By element: Atomic # 1 Polarization: 5.26 SS G_CDS: -9.86 Total: -4.60 kcal Atomic # 6 Polarization: -24.53 SS G_CDS: -1.40 Total: -25.93 kcal Atomic # 7 Polarization: -42.35 SS G_CDS: -0.72 Total: -43.08 kcal Atomic # 8 Polarization: -34.55 SS G_CDS: -2.01 Total: -36.56 kcal Atomic # 14 Polarization: 21.72 SS G_CDS: -5.02 Total: 16.69 kcal Atomic # 16 Polarization: 40.17 SS G_CDS: -0.61 Total: 39.57 kcal Total LS contribution 6.23 Total: 6.23 kcal Total: -34.29 -13.38 -47.68 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. ZINC000096428573.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 -42.971 kcal (2) G-P(sol) polarization free energy of solvation -34.294 kcal (3) G-ENP(sol) elect.-nuc.-pol. free energy of system -77.264 kcal (4) G-CDS(sol) cavity-dispersion-solvent structure free energy -13.383 kcal (5) G-P-CDS(sol) = G-P(sol) + G-CDS(sol) = (2) + (4) -47.677 kcal (6) G-S(sol) free energy of system = (1) + (5) -90.647 kcal 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED Total computer time = 1.21 seconds