Wall clock time and date at job start Sat Apr 11 2020 06:11:38 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 C 2 2 O 1.42898 * 1 3 3 C 1.42910 * 113.99810 * 2 1 4 4 H 1.08993 * 109.57090 * 29.84651 * 3 2 1 5 5 C 1.53093 * 109.52203 * 269.69101 * 3 2 1 6 6 O 1.42904 * 109.41422 * 297.70143 * 5 3 2 7 7 C 1.42902 * 114.09617 * 298.84444 * 6 5 3 8 8 C 1.53086 * 109.41492 * 61.15968 * 7 6 5 9 9 C 1.53171 * 109.16469 * 302.38553 * 8 7 6 10 10 H 1.08993 * 109.54713 * 297.03194 * 9 8 7 11 11 C 1.53001 * 109.54608 * 176.84677 * 9 8 7 12 12 C 1.50699 * 109.46705 * 65.00508 * 11 9 8 13 13 O 1.21285 * 120.00257 * 359.97438 * 12 11 9 14 14 N 1.34778 * 119.99785 * 180.02562 * 12 11 9 15 15 C 1.46504 * 119.99827 * 180.02562 * 14 12 11 16 16 C 1.53000 * 109.47273 * 179.97438 * 15 14 12 17 17 C 1.52999 * 109.47271 * 179.97438 * 16 15 14 18 18 N 1.46504 * 109.46942 * 180.02562 * 17 16 15 19 19 C 1.36933 * 119.99568 * 269.99873 * 18 17 16 20 20 H 1.08001 * 120.00070 * 140.54263 * 19 18 17 21 21 C 1.38812 * 120.00238 * 320.53220 * 19 18 17 22 22 N 1.31612 * 120.00313 * 340.28654 * 21 19 18 23 23 Si 1.86805 * 120.00072 * 160.27956 * 21 19 18 24 24 H 1.48506 * 109.47158 * 0.02562 * 23 21 19 25 25 H 1.48499 * 109.47084 * 120.00371 * 23 21 19 26 26 H 1.48499 * 109.47419 * 240.00537 * 23 21 19 27 27 C 1.46500 * 120.00122 * 89.99591 * 18 17 16 28 28 C 1.53001 * 117.49623 * 183.28305 * 27 18 17 29 29 C 1.53005 * 60.00226 * 252.51451 * 28 27 18 30 30 H 1.08999 * 109.47102 * 180.02562 * 1 2 3 31 31 H 1.09004 * 109.46863 * 299.99260 * 1 2 3 32 32 H 1.08996 * 109.47531 * 59.99793 * 1 2 3 33 33 H 1.09000 * 109.48103 * 177.71861 * 5 3 2 34 34 H 1.09002 * 109.48972 * 57.69013 * 5 3 2 35 35 H 1.09000 * 109.47920 * 301.16999 * 7 6 5 36 36 H 1.09002 * 109.48727 * 181.14800 * 7 6 5 37 37 H 1.09006 * 109.52067 * 182.48369 * 8 7 6 38 38 H 1.09003 * 109.57684 * 62.32754 * 8 7 6 39 39 H 1.08996 * 109.47603 * 305.00621 * 11 9 8 40 40 H 1.08997 * 109.47247 * 185.00091 * 11 9 8 41 41 H 0.96992 * 120.00561 * 359.97438 * 14 12 11 42 42 H 1.08999 * 109.47463 * 59.99748 * 15 14 12 43 43 H 1.09005 * 109.46952 * 299.99985 * 15 14 12 44 44 H 1.08999 * 109.46975 * 59.99580 * 16 15 14 45 45 H 1.09005 * 109.46871 * 300.00358 * 16 15 14 46 46 H 1.08993 * 109.46843 * 60.00197 * 17 16 15 47 47 H 1.08997 * 109.46912 * 299.99754 * 17 16 15 48 48 H 0.96997 * 120.00632 * 175.01277 * 22 21 19 49 49 H 1.08995 * 115.55923 * 328.98279 * 27 18 17 50 50 H 1.08993 * 117.50049 * 0.02562 * 28 27 18 51 51 H 1.09003 * 117.49514 * 145.02317 * 28 27 18 52 52 H 1.08996 * 117.50058 * 252.51448 * 29 28 27 53 53 H 1.09003 * 117.51195 * 107.48050 * 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 1.3056 0.0000 4 1 1.3449 2.0014 0.5111 5 6 2.2254 1.7698 -1.4429 6 8 3.1431 0.8885 -2.0935 7 6 4.4379 0.8455 -1.4903 8 6 4.3115 0.3441 -0.0494 9 6 3.3607 1.2646 0.7218 10 1 3.7820 2.2688 0.7668 11 6 3.1664 0.7268 2.1409 12 6 4.4746 0.7920 2.8862 13 8 5.4649 1.2254 2.3363 14 7 4.5442 0.3677 4.1635 15 6 5.8159 0.4315 4.8882 16 6 5.6217 -0.1064 6.3073 17 6 6.9499 -0.0403 7.0640 18 7 6.7641 -0.5559 8.4226 19 6 6.4079 0.2947 9.4349 20 1 5.6962 -0.0234 10.1823 21 6 6.9618 1.5658 9.5006 22 7 8.0813 1.8298 8.8609 23 14 6.1181 2.9020 10.4968 24 1 4.8846 2.3536 11.1159 25 1 7.0360 3.3794 11.5621 26 1 5.7632 4.0350 9.6049 27 6 6.9592 -1.9815 8.6982 28 6 6.6756 -2.4715 10.1196 29 6 8.1178 -2.3709 9.6186 30 1 -0.3633 -1.0277 0.0005 31 1 -0.3633 0.5137 0.8901 32 1 -0.3634 0.5138 -0.8899 33 1 2.6310 2.7815 -1.4426 34 1 1.2735 1.7599 -1.9739 35 1 4.8725 1.8451 -1.4907 36 1 5.0800 0.1698 -2.0553 37 1 5.2922 0.3524 0.4265 38 1 3.9153 -0.6713 -0.0494 39 1 2.8260 -0.3076 2.0941 40 1 2.4222 1.3311 2.6597 41 1 3.7524 0.0207 4.6032 42 1 6.1556 1.4661 4.9355 43 1 6.5606 -0.1720 4.3692 44 1 5.2818 -1.1409 6.2604 45 1 4.8771 0.4975 6.8260 46 1 7.2902 0.9941 7.1109 47 1 7.6941 -0.6445 6.5451 48 1 8.4302 2.7347 8.8468 49 1 6.7208 -2.6563 7.8761 50 1 6.3434 -1.7333 10.8495 51 1 6.2504 -3.4688 10.2326 52 1 8.6414 -3.3020 9.4021 53 1 8.7349 -1.5664 10.0188 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 ZINC001660691781.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 06:11:38 Heat of formation + Delta-G solvation = -93.380133 kcal Electronic energy + Delta-G solvation = -30154.175510 eV Core-core repulsion = 26027.163985 eV Total energy + Delta-G solvation = -4127.011525 eV No. of doubly occupied orbitals = 66 Molecular weight (most abundant/longest-lived isotopes) = 340.220 amu Computer time = 0.85 seconds Orbital eigenvalues (eV) -40.48515 -39.21559 -37.24247 -37.13464 -35.40783 -34.24519 -33.54820 -31.67785 -30.76246 -29.85871 -28.64788 -26.90914 -25.44996 -24.07040 -23.61413 -22.93951 -21.42774 -20.99248 -20.43043 -19.99509 -19.57417 -17.17736 -16.82210 -16.69849 -16.43252 -15.99899 -15.86822 -15.62300 -15.29571 -15.25712 -15.03824 -14.63090 -14.30633 -14.16514 -13.85774 -13.70874 -13.09584 -13.02434 -12.72847 -12.60294 -12.46320 -12.16170 -12.00087 -11.80887 -11.63704 -11.46967 -11.22701 -11.05754 -10.95005 -10.83448 -10.74180 -10.67516 -10.56322 -10.29696 -10.20242 -10.11328 -9.72769 -9.62128 -9.57804 -9.32403 -9.24564 -8.82417 -8.50743 -6.55735 -5.81141 -3.48638 2.75174 3.28736 3.31675 3.36610 3.39775 3.41297 3.75741 4.35462 4.40476 4.42293 4.56589 4.64144 4.89977 4.93654 4.97163 4.99756 5.09038 5.10874 5.16495 5.18187 5.24518 5.30209 5.31021 5.37446 5.44246 5.55260 5.63893 5.70485 5.77171 5.81839 5.91399 6.00382 6.02040 6.12545 6.20986 6.27235 6.37178 6.41312 6.49926 6.65809 6.66691 6.76551 6.78494 7.03811 7.05698 7.08547 7.24001 7.60256 7.66518 7.76746 8.35851 8.46904 9.12483 9.73418 10.32335 11.13304 Molecular weight = 340.22amu Principal moments of inertia in cm(-1) A = 0.015687 B = 0.002036 C = 0.001979 Principal moments of inertia in units of 10**(-40)*gram-cm**2 A = 1784.492415 B =13750.441479 C =14145.679127 Net atomic charges, atomic populations, and dipole contributions calculated with CM2 Atom NO. Type Charge No. of electrons 1 C 0.029 3.971 2 O -0.368 6.368 3 C 0.057 3.943 4 H 0.070 0.930 5 C 0.042 3.958 6 O -0.375 6.375 7 C 0.061 3.939 8 C -0.151 4.151 9 C -0.067 4.067 10 H 0.090 0.910 11 C -0.133 4.133 12 C 0.508 3.492 13 O -0.544 6.544 14 N -0.727 5.727 15 C 0.121 3.879 16 C -0.146 4.146 17 C 0.155 3.845 18 N -0.552 5.552 19 C -0.260 4.260 20 H 0.063 0.937 21 C 0.015 3.985 22 N -0.881 5.881 23 Si 0.894 3.106 24 H -0.275 1.275 25 H -0.289 1.289 26 H -0.287 1.287 27 C 0.121 3.879 28 C -0.196 4.196 29 C -0.222 4.222 30 H 0.086 0.914 31 H 0.040 0.960 32 H 0.039 0.961 33 H 0.059 0.941 34 H 0.092 0.908 35 H 0.049 0.951 36 H 0.093 0.907 37 H 0.095 0.905 38 H 0.073 0.927 39 H 0.100 0.900 40 H 0.089 0.911 41 H 0.399 0.601 42 H 0.066 0.934 43 H 0.062 0.938 44 H 0.050 0.950 45 H 0.065 0.935 46 H 0.095 0.905 47 H 0.028 0.972 48 H 0.255 0.745 49 H 0.085 0.915 50 H 0.096 0.904 51 H 0.073 0.927 52 H 0.068 0.932 53 H 0.091 0.909 For the charges calculated by CM2: Dipole moment (debyes) X Y Z Total from point charges -13.968 -2.213 -18.051 22.932 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 -0.068 4.068 2 O -0.287 6.287 3 C -0.001 4.001 4 H 0.088 0.912 5 C -0.035 4.035 6 O -0.294 6.294 7 C -0.015 4.015 8 C -0.189 4.189 9 C -0.086 4.086 10 H 0.109 0.891 11 C -0.173 4.173 12 C 0.295 3.705 13 O -0.422 6.422 14 N -0.377 5.377 15 C -0.003 4.003 16 C -0.186 4.186 17 C 0.028 3.972 18 N -0.268 5.268 19 C -0.390 4.390 20 H 0.081 0.919 21 C -0.186 4.186 22 N -0.523 5.523 23 Si 0.723 3.277 24 H -0.200 1.200 25 H -0.216 1.216 26 H -0.214 1.214 27 C 0.012 3.988 28 C -0.234 4.234 29 C -0.263 4.263 30 H 0.104 0.896 31 H 0.059 0.941 32 H 0.058 0.942 33 H 0.077 0.923 34 H 0.110 0.890 35 H 0.068 0.932 36 H 0.111 0.889 37 H 0.113 0.887 38 H 0.092 0.908 39 H 0.119 0.881 40 H 0.107 0.893 41 H 0.232 0.768 42 H 0.084 0.916 43 H 0.080 0.920 44 H 0.069 0.931 45 H 0.084 0.916 46 H 0.113 0.887 47 H 0.047 0.953 48 H 0.065 0.935 49 H 0.103 0.897 50 H 0.115 0.885 51 H 0.091 0.909 52 H 0.087 0.913 53 H 0.110 0.890 Dipole moment (debyes) X Y Z Total from point charges -13.036 -2.012 -18.559 22.769 hybrid contribution -0.958 0.958 1.166 1.788 sum -13.994 -1.055 -17.393 22.349 Atomic orbital electron populations 1.22808 0.81454 1.02848 0.99703 1.87993 1.19098 1.26667 1.94912 1.22883 0.95250 0.85772 0.96233 0.91223 1.23017 0.94271 0.93163 0.93060 1.87937 1.22436 1.65315 1.53691 1.22618 0.84394 1.00724 0.93801 1.22290 1.01555 0.99695 0.95346 1.21038 0.93577 1.01065 0.92955 0.89144 1.21645 0.95787 1.04433 0.95443 1.20635 0.90659 0.77357 0.81891 1.90656 1.37918 1.46074 1.67536 1.46209 1.13663 1.64749 1.13114 1.21443 0.84538 1.01730 0.92573 1.22450 1.03473 0.99901 0.92761 1.20752 0.91071 1.02271 0.83109 1.43356 1.78145 1.01040 1.04301 1.19047 1.18270 0.94888 1.06747 0.91897 1.25256 0.94502 1.00121 0.98752 1.70061 1.17377 1.19605 1.45250 0.86381 0.79333 0.82154 0.79828 1.20019 1.21562 1.21363 1.21232 0.99137 0.87656 0.90813 1.23014 0.99598 1.00473 1.00353 1.23348 0.91760 1.01548 1.09600 0.89590 0.94104 0.94248 0.92310 0.89009 0.93244 0.88867 0.88701 0.90828 0.88145 0.89278 0.76777 0.91585 0.92002 0.93150 0.91600 0.88728 0.95312 0.93537 0.89712 0.88523 0.90879 0.91314 0.88998 Number of geometries 1 Number of calculations of the screened coulomb radii 1 The total number of SCF iterations 15. 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 0.18 10.82 101.05 1.09 1.28 16 2 O -0.37 -3.46 9.07 -42.72 -0.39 -3.85 16 3 C 0.06 0.48 2.43 -26.59 -0.06 0.41 16 4 H 0.07 0.46 7.79 -51.93 -0.40 0.06 16 5 C 0.04 0.36 6.49 37.21 0.24 0.60 16 6 O -0.38 -4.16 10.70 -42.72 -0.46 -4.62 16 7 C 0.06 0.62 6.84 37.20 0.25 0.87 16 8 C -0.15 -1.66 4.96 -26.60 -0.13 -1.80 16 9 C -0.07 -0.67 1.76 -90.44 -0.16 -0.83 16 10 H 0.09 0.95 7.96 -51.93 -0.41 0.54 16 11 C -0.13 -1.30 4.94 -27.88 -0.14 -1.43 16 12 C 0.51 6.79 7.57 -10.99 -0.08 6.71 16 13 O -0.54 -9.11 13.98 5.55 0.08 -9.03 16 14 N -0.73 -9.55 5.56 -60.29 -0.33 -9.88 16 15 C 0.12 1.94 5.67 -4.04 -0.02 1.91 16 16 C -0.15 -2.57 5.65 -26.73 -0.15 -2.72 16 17 C 0.15 3.40 5.33 -4.04 -0.02 3.37 16 18 N -0.55 -13.12 2.75 -165.66 -0.46 -13.57 16 19 C -0.26 -6.75 8.47 -15.06 -0.13 -6.88 16 20 H 0.06 1.65 6.74 -52.49 -0.35 1.30 16 21 C 0.01 0.39 4.98 -17.43 -0.09 0.30 16 22 N -0.88 -24.61 11.50 55.49 0.64 -23.97 16 23 Si 0.89 20.90 29.60 -169.99 -5.03 15.87 16 24 H -0.28 -6.31 7.11 56.52 0.40 -5.91 16 25 H -0.29 -6.88 7.11 56.52 0.40 -6.47 16 26 H -0.29 -6.73 7.11 56.52 0.40 -6.32 16 27 C 0.12 2.53 6.56 -67.92 -0.45 2.09 16 28 C -0.20 -3.84 9.80 -26.73 -0.26 -4.10 16 29 C -0.22 -4.53 10.36 -26.72 -0.28 -4.81 16 30 H 0.09 0.48 8.14 -51.93 -0.42 0.06 16 31 H 0.04 0.22 8.09 -51.93 -0.42 -0.20 16 32 H 0.04 0.22 7.86 -51.93 -0.41 -0.19 16 33 H 0.06 0.43 8.14 -51.93 -0.42 0.00 16 34 H 0.09 0.65 7.86 -51.93 -0.41 0.24 16 35 H 0.05 0.47 8.14 -51.93 -0.42 0.05 16 36 H 0.09 0.85 8.14 -51.93 -0.42 0.42 16 37 H 0.09 1.22 6.03 -51.93 -0.31 0.91 16 38 H 0.07 0.86 7.83 -51.93 -0.41 0.45 16 39 H 0.10 0.93 7.76 -51.93 -0.40 0.53 16 40 H 0.09 0.71 8.14 -51.93 -0.42 0.29 16 41 H 0.40 4.26 8.47 -40.82 -0.35 3.91 16 42 H 0.07 1.18 8.14 -51.93 -0.42 0.75 16 43 H 0.06 1.02 8.14 -51.93 -0.42 0.60 16 44 H 0.05 0.83 8.14 -51.93 -0.42 0.41 16 45 H 0.07 1.24 8.14 -51.93 -0.42 0.82 16 46 H 0.10 2.38 5.59 -51.93 -0.29 2.09 16 47 H 0.03 0.61 8.07 -51.93 -0.42 0.19 16 48 H 0.25 6.88 8.32 -40.82 -0.34 6.54 16 49 H 0.09 1.60 8.14 -51.93 -0.42 1.18 16 50 H 0.10 2.06 6.46 -51.93 -0.34 1.73 16 51 H 0.07 1.22 8.14 -51.93 -0.42 0.80 16 52 H 0.07 1.23 8.14 -51.93 -0.42 0.80 16 53 H 0.09 2.16 8.14 -51.93 -0.42 1.74 16 LS Contribution 417.80 15.07 6.30 6.30 Total: -1.00 -30.91 417.80 -9.59 -40.50 By element: Atomic # 1 Polarization: 16.84 SS G_CDS: -9.55 Total: 7.29 kcal Atomic # 6 Polarization: -4.64 SS G_CDS: -0.38 Total: -5.02 kcal Atomic # 7 Polarization: -47.28 SS G_CDS: -0.15 Total: -47.43 kcal Atomic # 8 Polarization: -16.74 SS G_CDS: -0.77 Total: -17.50 kcal Atomic # 14 Polarization: 20.90 SS G_CDS: -5.03 Total: 15.87 kcal Total LS contribution 6.30 Total: 6.30 kcal Total: -30.91 -9.59 -40.50 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. ZINC001660691781.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 -52.876 kcal (2) G-P(sol) polarization free energy of solvation -30.915 kcal (3) G-ENP(sol) elect.-nuc.-pol. free energy of system -83.791 kcal (4) G-CDS(sol) cavity-dispersion-solvent structure free energy -9.589 kcal (5) G-P-CDS(sol) = G-P(sol) + G-CDS(sol) = (2) + (4) -40.504 kcal (6) G-S(sol) free energy of system = (1) + (5) -93.380 kcal 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED Total computer time = 0.85 seconds