Wall clock time and date at job start Sat Apr 11 2020 08:07:25 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 1.31614 * 1 3 3 Si 1.86804 * 119.99877 * 2 1 4 4 H 1.48496 * 109.47423 * 240.00169 * 3 2 1 5 5 H 1.48502 * 109.46758 * 0.02562 * 3 2 1 6 6 H 1.48495 * 109.47119 * 119.99803 * 3 2 1 7 7 C 1.38812 * 120.00341 * 179.97438 * 2 1 3 8 8 H 1.08003 * 119.99823 * 180.02562 * 7 2 1 9 9 N 1.36937 * 119.99949 * 0.02562 * 7 2 1 10 10 C 1.46498 * 120.00198 * 179.97438 * 9 7 2 11 11 C 1.52994 * 109.47402 * 179.97438 * 10 9 7 12 12 C 1.53782 * 113.61734 * 185.00278 * 11 10 9 13 13 C 1.53781 * 87.08260 * 220.02231 * 12 11 10 14 14 N 1.46497 * 113.61305 * 270.79919 * 13 12 11 15 15 C 1.34780 * 119.99653 * 203.46742 * 14 13 12 16 16 O 1.21596 * 120.00439 * 0.02562 * 15 14 13 17 17 C 1.47437 * 119.99471 * 179.97438 * 15 14 13 18 18 C 1.38042 * 126.41786 * 359.69347 * 17 15 14 19 19 N 1.34257 * 107.41305 * 179.86727 * 18 17 15 20 20 H 0.97007 * 125.74762 * 180.11110 * 19 18 17 21 21 N 1.39933 * 108.49523 * 0.39578 * 19 18 17 22 22 C 1.30443 * 108.89744 * 359.75012 * 21 19 18 23 23 C 1.50701 * 125.98987 * 180.02562 * 22 21 19 24 24 C 1.53003 * 109.47063 * 59.99531 * 23 22 21 25 25 C 1.53000 * 109.46911 * 180.02562 * 24 23 22 26 26 C 1.53000 * 109.47327 * 60.00046 * 25 24 23 27 27 C 1.53002 * 109.46875 * 300.00171 * 26 25 24 28 28 C 1.52995 * 109.46768 * 299.99772 * 23 22 21 29 29 C 1.53786 * 87.17350 * 25.39213 * 13 12 11 30 30 H 0.97001 * 120.00336 * 0.02562 * 1 2 3 31 31 H 0.97001 * 119.99671 * 359.97438 * 9 7 2 32 32 H 1.09005 * 109.46421 * 60.00512 * 10 9 7 33 33 H 1.08998 * 109.47294 * 300.00559 * 10 9 7 34 34 H 1.09002 * 112.84929 * 316.20353 * 11 10 9 35 35 H 1.09001 * 113.61250 * 105.47049 * 12 11 10 36 36 H 1.08996 * 113.68722 * 334.58363 * 12 11 10 37 37 H 1.09002 * 113.61445 * 139.98212 * 13 12 11 38 38 H 0.96995 * 120.00146 * 23.47603 * 14 13 12 39 39 H 1.08001 * 126.29125 * 0.02562 * 18 17 15 40 40 H 1.08994 * 109.47060 * 180.02562 * 23 22 21 41 41 H 1.08994 * 109.47132 * 300.00165 * 24 23 22 42 42 H 1.08999 * 109.46927 * 60.00224 * 24 23 22 43 43 H 1.09004 * 109.46954 * 299.99817 * 25 24 23 44 44 H 1.09004 * 109.46802 * 180.02562 * 25 24 23 45 45 H 1.08993 * 109.46964 * 180.02562 * 26 25 24 46 46 H 1.08999 * 109.46721 * 59.99545 * 26 25 24 47 47 H 1.08999 * 109.46934 * 299.99243 * 27 26 25 48 48 H 1.08999 * 109.46715 * 179.97438 * 27 26 25 49 49 H 1.09004 * 109.47369 * 299.99729 * 28 23 22 50 50 H 1.09004 * 109.47534 * 60.00025 * 28 23 22 51 51 H 1.08993 * 113.61491 * 89.15923 * 29 13 12 52 52 H 1.09000 * 113.61138 * 220.06261 * 29 13 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 1.3161 0.0000 0.0000 3 14 2.2501 1.6178 0.0000 4 1 3.1038 1.6966 -1.2125 5 1 1.2850 2.7464 0.0006 6 1 3.1038 1.6965 1.2125 7 6 2.0103 -1.2021 0.0005 8 1 3.0903 -1.2020 0.0010 9 7 1.3256 -2.3881 0.0005 10 6 2.0582 -3.6568 0.0005 11 6 1.0640 -4.8197 0.0012 12 6 1.7307 -6.2000 0.1241 13 6 0.7048 -6.7001 -0.9066 14 7 -0.5376 -7.1926 -0.3066 15 6 -1.3097 -8.0687 -0.9795 16 8 -0.9749 -8.4507 -2.0843 17 6 -2.5598 -8.5648 -0.3754 18 6 -3.0605 -8.2271 0.8659 19 7 -4.2147 -8.8934 1.0284 20 1 -4.7897 -8.8490 1.8085 21 7 -4.4451 -9.6675 -0.1143 22 6 -3.4665 -9.4797 -0.9561 23 6 -3.3278 -10.1249 -2.3110 24 6 -4.5278 -9.7464 -3.1814 25 6 -4.3872 -10.4020 -4.5567 26 6 -4.3345 -11.9224 -4.3940 27 6 -3.1345 -12.3008 -3.5235 28 6 -3.2748 -11.6453 -2.1487 29 6 0.6142 -5.2488 -1.4073 30 1 -0.4851 0.8400 -0.0004 31 1 0.3556 -2.3880 0.0005 32 1 2.6847 -3.7144 0.8906 33 1 2.6849 -3.7145 -0.8894 34 1 0.2382 -4.6702 0.6967 35 1 1.6171 -6.6536 1.1087 36 1 2.7590 -6.2234 -0.2366 37 1 1.1232 -7.3896 -1.6399 38 1 -0.8045 -6.8881 0.5747 39 1 -2.6083 -7.5492 1.5748 40 1 -2.4101 -9.7784 -2.7861 41 1 -5.4453 -10.0933 -2.7060 42 1 -4.5656 -8.6632 -3.2969 43 1 -3.4697 -10.0554 -5.0323 44 1 -5.2420 -10.1320 -5.1769 45 1 -4.2339 -12.3893 -5.3737 46 1 -5.2520 -12.2688 -3.9183 47 1 -2.2170 -11.9543 -3.9991 48 1 -3.0972 -13.3839 -3.4072 49 1 -2.4198 -11.9149 -1.5286 50 1 -4.1923 -11.9922 -1.6733 51 1 1.3365 -5.0104 -2.1879 52 1 -0.3995 -4.9357 -1.6572 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 ZINC001328941793.mol2 52 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 08:07:25 Heat of formation + Delta-G solvation = 38.921850 kcal Electronic energy + Delta-G solvation = -30082.229141 eV Core-core repulsion = 26082.788801 eV Total energy + Delta-G solvation = -3999.440340 eV No. of doubly occupied orbitals = 66 Molecular weight (most abundant/longest-lived isotopes) = 346.211 amu Computer time = 0.84 seconds Orbital eigenvalues (eV) -41.77050 -39.87470 -38.52207 -37.99897 -34.52547 -33.30375 -32.98532 -31.05117 -30.90591 -30.22914 -29.80247 -26.78706 -25.47489 -23.92676 -23.75975 -22.95631 -22.72118 -21.48006 -20.93089 -19.93346 -19.47683 -19.04917 -18.49217 -17.06467 -16.60778 -15.78407 -15.75600 -15.41560 -14.85438 -14.53782 -14.51594 -14.40623 -14.30971 -14.25355 -13.97636 -13.76911 -13.49587 -13.29878 -12.73923 -12.71170 -12.38540 -12.35356 -12.32624 -12.11748 -11.60330 -11.43059 -11.27403 -11.20884 -11.02306 -10.80946 -10.70792 -10.47929 -10.45668 -10.38086 -10.33607 -10.08827 -9.81751 -9.70888 -9.69523 -9.58711 -9.16015 -8.88711 -8.80130 -6.89179 -5.75037 -3.03055 1.23811 1.94344 2.39843 3.17657 3.36501 3.44708 3.48934 3.50027 4.13841 4.32536 4.57470 4.59104 4.62726 4.66211 4.71977 4.85815 4.90785 5.06676 5.12879 5.14057 5.16809 5.18826 5.30323 5.35107 5.37861 5.38821 5.51884 5.59211 5.64467 5.77338 5.85811 5.89732 5.92412 5.96695 6.00147 6.00506 6.04870 6.08024 6.13390 6.16416 6.20422 6.28391 6.34305 6.41075 6.45754 6.68129 6.79197 6.80948 6.96226 7.25679 7.55516 7.70760 8.27647 8.44319 9.55165 10.14676 10.48998 11.47882 Molecular weight = 346.21amu Principal moments of inertia in cm(-1) A = 0.016548 B = 0.001911 C = 0.001896 Principal moments of inertia in units of 10**(-40)*gram-cm**2 A = 1691.674350 B =14647.440744 C =14765.427432 Net atomic charges, atomic populations, and dipole contributions calculated with CM2 Atom NO. Type Charge No. of electrons 1 N -0.935 5.935 2 C -0.016 4.016 3 Si 0.907 3.093 4 H -0.286 1.286 5 H -0.291 1.291 6 H -0.286 1.286 7 C -0.238 4.238 8 H 0.069 0.931 9 N -0.732 5.732 10 C 0.162 3.838 11 C -0.113 4.113 12 C -0.138 4.138 13 C 0.119 3.881 14 N -0.708 5.708 15 C 0.596 3.404 16 O -0.540 6.540 17 C -0.286 4.286 18 C 0.105 3.895 19 N -0.462 5.462 20 H 0.444 0.556 21 N -0.295 5.295 22 C 0.145 3.855 23 C -0.022 4.022 24 C -0.107 4.107 25 C -0.119 4.119 26 C -0.119 4.119 27 C -0.119 4.119 28 C -0.106 4.106 29 C -0.139 4.139 30 H 0.255 0.745 31 H 0.383 0.617 32 H 0.018 0.982 33 H 0.020 0.980 34 H 0.086 0.914 35 H 0.068 0.932 36 H 0.094 0.906 37 H 0.100 0.900 38 H 0.397 0.603 39 H 0.186 0.814 40 H 0.119 0.881 41 H 0.064 0.936 42 H 0.062 0.938 43 H 0.066 0.934 44 H 0.062 0.938 45 H 0.060 0.940 46 H 0.060 0.940 47 H 0.066 0.934 48 H 0.061 0.939 49 H 0.060 0.940 50 H 0.064 0.936 51 H 0.090 0.910 52 H 0.068 0.932 For the charges calculated by CM2: Dipole moment (debyes) X Y Z Total from point charges -9.084 -26.160 -0.403 27.695 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 -0.584 5.584 2 C -0.211 4.211 3 Si 0.738 3.262 4 H -0.213 1.213 5 H -0.217 1.217 6 H -0.213 1.213 7 C -0.370 4.370 8 H 0.087 0.913 9 N -0.376 5.376 10 C 0.034 3.966 11 C -0.132 4.132 12 C -0.177 4.177 13 C 0.014 3.986 14 N -0.358 5.358 15 C 0.384 3.616 16 O -0.418 6.418 17 C -0.301 4.301 18 C -0.048 4.048 19 N -0.166 5.166 20 H 0.289 0.711 21 N -0.116 5.116 22 C -0.024 4.024 23 C -0.042 4.042 24 C -0.145 4.145 25 C -0.157 4.157 26 C -0.157 4.157 27 C -0.156 4.156 28 C -0.144 4.144 29 C -0.177 4.177 30 H 0.065 0.935 31 H 0.216 0.784 32 H 0.035 0.965 33 H 0.038 0.962 34 H 0.104 0.896 35 H 0.086 0.914 36 H 0.113 0.887 37 H 0.118 0.882 38 H 0.231 0.769 39 H 0.203 0.797 40 H 0.137 0.863 41 H 0.083 0.917 42 H 0.081 0.919 43 H 0.085 0.915 44 H 0.080 0.920 45 H 0.079 0.921 46 H 0.079 0.921 47 H 0.084 0.916 48 H 0.080 0.920 49 H 0.079 0.921 50 H 0.083 0.917 51 H 0.108 0.892 52 H 0.087 0.913 Dipole moment (debyes) X Y Z Total from point charges -9.808 -26.913 -0.983 28.662 hybrid contribution 0.428 1.874 1.065 2.198 sum -9.380 -25.039 0.082 26.739 Atomic orbital electron populations 1.69646 1.05099 1.25684 1.57927 1.24739 0.95533 0.97682 1.03190 0.86266 0.78508 0.83574 0.77836 1.21273 1.21727 1.21326 1.19204 0.91000 0.84293 1.42480 0.91293 1.42339 1.05818 0.99997 1.89407 1.20641 0.93041 0.85233 0.97649 1.22781 0.98999 0.94193 0.97183 1.23307 0.98946 0.96559 0.98840 1.21910 0.84278 0.95917 0.96509 1.45512 1.23519 1.45770 1.20973 1.17208 0.81919 0.77882 0.84594 1.90696 1.72535 1.58870 1.19676 1.20312 1.01793 1.10753 0.97203 1.23187 0.88086 0.95978 0.97528 1.46138 1.18690 1.34732 1.17004 0.71149 1.77144 1.23336 1.16797 0.94353 1.22424 0.90056 0.93842 0.96052 1.20056 1.01880 0.94532 0.87763 1.21515 0.97367 1.00467 0.95134 1.21528 1.02142 0.95237 0.96750 1.21543 0.98489 0.96074 0.99579 1.21519 0.98767 0.99821 0.95516 1.21500 1.02020 0.93585 0.97270 1.23443 1.02461 0.94269 0.97569 0.93533 0.78360 0.96470 0.96192 0.89566 0.91362 0.88722 0.88242 0.76914 0.79683 0.86280 0.91728 0.91924 0.91542 0.91959 0.92142 0.92123 0.91573 0.92038 0.92098 0.91741 0.89162 0.91313 Number of geometries 1 Number of calculations of the screened coulomb radii 1 The total number of SCF iterations 14. 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 -0.93 -28.34 13.06 55.49 0.72 -27.62 16 2 C -0.02 -0.45 5.50 -17.43 -0.10 -0.55 16 3 Si 0.91 22.50 29.55 -169.99 -5.02 17.47 16 4 H -0.29 -6.99 7.11 56.52 0.40 -6.59 16 5 H -0.29 -7.27 7.11 56.52 0.40 -6.87 16 6 H -0.29 -6.97 7.11 56.52 0.40 -6.57 16 7 C -0.24 -6.71 9.99 -15.06 -0.15 -6.86 16 8 H 0.07 1.88 7.83 -52.48 -0.41 1.47 16 9 N -0.73 -18.46 5.60 -59.91 -0.34 -18.80 16 10 C 0.16 3.17 6.10 -4.05 -0.02 3.15 16 11 C -0.11 -1.69 3.64 -89.71 -0.33 -2.02 16 12 C -0.14 -1.60 7.38 -25.92 -0.19 -1.79 16 13 C 0.12 1.47 4.30 -67.12 -0.29 1.18 16 14 N -0.71 -7.83 5.25 -54.09 -0.28 -8.11 16 15 C 0.60 7.68 7.81 -12.51 -0.10 7.58 16 16 O -0.54 -8.56 14.18 5.28 0.07 -8.48 16 17 C -0.29 -3.17 6.13 -105.06 -0.64 -3.81 16 18 C 0.11 0.80 11.52 -16.56 -0.19 0.61 16 19 N -0.46 -3.46 7.29 30.85 0.22 -3.24 16 20 H 0.44 1.76 8.96 -182.72 -1.64 0.12 16 21 N -0.29 -3.17 12.63 33.90 0.43 -2.74 16 22 C 0.14 1.67 5.77 -82.02 -0.47 1.20 16 23 C -0.02 -0.24 2.53 -91.77 -0.23 -0.47 16 24 C -0.11 -1.07 5.19 -26.73 -0.14 -1.21 16 25 C -0.12 -1.02 5.92 -26.73 -0.16 -1.18 16 26 C -0.12 -0.91 5.92 -26.73 -0.16 -1.07 16 27 C -0.12 -0.97 5.92 -26.75 -0.16 -1.12 16 28 C -0.11 -1.00 5.18 -26.76 -0.14 -1.14 16 29 C -0.14 -2.04 7.45 -25.82 -0.19 -2.23 16 30 H 0.25 7.49 8.31 -40.82 -0.34 7.15 16 31 H 0.38 10.15 7.67 -40.82 -0.31 9.84 16 32 H 0.02 0.34 8.14 -51.93 -0.42 -0.08 16 33 H 0.02 0.40 7.85 -51.93 -0.41 -0.01 16 34 H 0.09 1.30 8.14 -51.93 -0.42 0.88 16 35 H 0.07 0.69 8.14 -51.93 -0.42 0.27 16 36 H 0.09 1.05 8.10 -51.93 -0.42 0.63 16 37 H 0.10 1.30 7.50 -51.93 -0.39 0.91 16 38 H 0.40 3.40 7.63 -40.82 -0.31 3.09 16 39 H 0.19 0.69 7.46 -52.49 -0.39 0.30 16 40 H 0.12 1.54 5.60 -51.93 -0.29 1.25 16 41 H 0.06 0.65 8.14 -51.93 -0.42 0.23 16 42 H 0.06 0.68 8.14 -51.93 -0.42 0.26 16 43 H 0.07 0.60 8.14 -51.93 -0.42 0.18 16 44 H 0.06 0.48 8.14 -51.93 -0.42 0.06 16 45 H 0.06 0.41 8.14 -51.93 -0.42 -0.02 16 46 H 0.06 0.45 8.14 -51.93 -0.42 0.03 16 47 H 0.07 0.57 8.14 -51.93 -0.42 0.14 16 48 H 0.06 0.43 8.14 -51.93 -0.42 0.01 16 49 H 0.06 0.60 8.14 -51.93 -0.42 0.18 16 50 H 0.06 0.62 8.14 -51.93 -0.42 0.19 16 51 H 0.09 1.36 7.90 -51.93 -0.41 0.95 16 52 H 0.07 1.10 8.14 -51.93 -0.42 0.68 16 LS Contribution 413.95 15.07 6.24 6.24 Total: -1.00 -34.68 413.95 -11.65 -46.33 By element: Atomic # 1 Polarization: 18.73 SS G_CDS: -10.04 Total: 8.70 kcal Atomic # 6 Polarization: -6.08 SS G_CDS: -3.66 Total: -9.74 kcal Atomic # 7 Polarization: -61.27 SS G_CDS: 0.76 Total: -60.51 kcal Atomic # 8 Polarization: -8.56 SS G_CDS: 0.07 Total: -8.48 kcal Atomic # 14 Polarization: 22.50 SS G_CDS: -5.02 Total: 17.47 kcal Total LS contribution 6.24 Total: 6.24 kcal Total: -34.68 -11.65 -46.33 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. ZINC001328941793.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 85.255 kcal (2) G-P(sol) polarization free energy of solvation -34.683 kcal (3) G-ENP(sol) elect.-nuc.-pol. free energy of system 50.573 kcal (4) G-CDS(sol) cavity-dispersion-solvent structure free energy -11.651 kcal (5) G-P-CDS(sol) = G-P(sol) + G-CDS(sol) = (2) + (4) -46.334 kcal (6) G-S(sol) free energy of system = (1) + (5) 38.922 kcal 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED Total computer time = 0.85 seconds