Wall clock time and date at job start Tue Mar 31 2020 09:07:11 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 1.52994 * 1 3 3 C 1.53002 * 109.47539 * 2 1 4 4 H 1.08997 * 109.46772 * 54.46418 * 3 2 1 5 5 C 1.50698 * 109.47321 * 174.46393 * 3 2 1 6 6 H 1.07998 * 120.00163 * 119.99996 * 5 3 2 7 7 C 1.37879 * 119.99881 * 299.99992 * 5 3 2 8 8 N 1.31510 * 120.00342 * 0.02562 * 7 5 3 9 9 Si 1.86807 * 119.99738 * 180.02562 * 7 5 3 10 10 H 1.48502 * 109.47045 * 180.02562 * 9 7 5 11 11 H 1.48499 * 109.46971 * 299.99749 * 9 7 5 12 12 H 1.48492 * 109.47186 * 59.99925 * 9 7 5 13 13 N 1.46894 * 109.47203 * 294.46436 * 3 2 1 14 14 C 1.46901 * 111.00358 * 169.63704 * 13 3 2 15 15 H 1.08996 * 109.47511 * 178.38820 * 14 13 3 16 16 C 1.53007 * 109.46590 * 58.39402 * 14 13 3 17 17 C 1.53000 * 109.47322 * 298.39703 * 14 13 3 18 18 C 1.52996 * 109.47069 * 289.02787 * 17 14 13 19 19 C 1.53006 * 109.46652 * 304.80035 * 18 17 14 20 20 C 1.53004 * 109.46791 * 179.97438 * 19 18 17 21 21 C 1.52997 * 109.47583 * 300.00507 * 20 19 18 22 22 C 1.53001 * 109.47404 * 59.99574 * 21 20 19 23 23 C 1.53008 * 109.46964 * 60.00073 * 22 21 20 24 24 C 1.53005 * 109.47090 * 300.00409 * 23 22 21 25 25 C 1.53001 * 109.47034 * 59.99827 * 24 23 22 26 26 C 1.52996 * 109.47146 * 184.80551 * 18 17 14 27 27 C 1.52994 * 109.47269 * 64.80071 * 18 17 14 28 28 H 1.09004 * 109.47291 * 293.30308 * 1 2 3 29 29 H 1.08999 * 109.46949 * 53.29915 * 1 2 3 30 30 H 1.08994 * 109.47553 * 173.30318 * 1 2 3 31 31 H 1.09001 * 109.47327 * 239.99695 * 2 1 3 32 32 H 1.09001 * 109.47323 * 120.00468 * 2 1 3 33 33 H 0.96997 * 120.00535 * 179.97438 * 8 7 5 34 34 H 1.00898 * 111.00546 * 293.60003 * 13 3 2 35 35 H 1.08998 * 109.46939 * 289.53407 * 16 14 13 36 36 H 1.09001 * 109.47008 * 49.53237 * 16 14 13 37 37 H 1.08998 * 109.46982 * 169.53280 * 16 14 13 38 38 H 1.08999 * 109.46949 * 49.03000 * 17 14 13 39 39 H 1.08998 * 109.47161 * 169.02698 * 17 14 13 40 40 H 1.08994 * 109.47324 * 300.00355 * 19 18 17 41 41 H 1.09002 * 109.47209 * 60.00766 * 19 18 17 42 42 H 1.09002 * 109.47176 * 180.02562 * 20 19 18 43 43 H 1.08998 * 109.47023 * 299.99961 * 21 20 19 44 44 H 1.09001 * 109.47276 * 180.02562 * 21 20 19 45 45 H 1.08994 * 109.47258 * 179.97438 * 22 21 20 46 46 H 1.08996 * 109.47038 * 179.97438 * 23 22 21 47 47 H 1.09001 * 109.46791 * 60.00085 * 23 22 21 48 48 H 1.08993 * 109.46773 * 180.02562 * 24 23 22 49 49 H 1.08994 * 109.47259 * 60.00276 * 25 24 23 50 50 H 1.09007 * 109.46516 * 180.02562 * 25 24 23 51 51 H 1.09002 * 109.46877 * 299.99760 * 26 18 17 52 52 H 1.09002 * 109.47267 * 59.99784 * 26 18 17 53 53 H 1.08998 * 109.47375 * 300.00301 * 27 18 17 54 54 H 1.08996 * 109.47387 * 60.00210 * 27 18 17 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 1.5299 0.0000 0.0000 3 6 2.0400 1.4425 0.0000 4 1 1.5980 1.9841 0.8363 5 6 3.5408 1.4446 0.1371 6 1 4.1529 1.8867 -0.6351 7 6 4.1323 0.8822 1.2482 8 7 3.3870 0.3433 2.1883 9 14 5.9926 0.8855 1.4185 10 1 6.3743 0.2248 2.6925 11 1 6.5952 0.1479 0.2791 12 1 6.4872 2.2856 1.4188 13 7 1.6626 2.0953 -1.2606 14 6 1.9152 3.5412 -1.2009 15 1 1.6539 3.9955 -2.1566 16 6 3.3963 3.7884 -0.9069 17 6 1.0644 4.1623 -0.0913 18 6 -0.4061 4.1589 -0.5136 19 6 -0.5516 4.8714 -1.8599 20 6 -2.0220 4.8674 -2.2826 21 6 -2.5111 3.4237 -2.4140 22 6 -2.3656 2.7113 -1.0679 23 6 -3.2014 3.4389 -0.0128 24 6 -2.7123 4.8827 0.1186 25 6 -2.8579 5.5950 -1.2276 26 6 -1.2414 4.8868 0.5414 27 6 -0.8956 2.7154 -0.6450 28 1 -0.3634 0.4065 0.9439 29 1 -0.3633 0.6142 -0.8239 30 1 -0.3634 -1.0206 -0.1198 31 1 1.8933 -0.5139 -0.8899 32 1 1.8933 -0.5139 0.8899 33 1 3.8032 -0.0527 2.9698 34 1 2.1427 1.6763 -2.0428 35 1 3.6153 3.5015 0.1216 36 1 4.0059 3.1940 -1.5876 37 1 3.6227 4.8456 -1.0454 38 1 1.1810 3.5818 0.8239 39 1 1.3895 5.1877 0.0850 40 1 -0.2027 5.8997 -1.7663 41 1 0.0435 4.3528 -2.6116 42 1 -2.1257 5.3746 -3.2419 43 1 -1.9157 2.9054 -3.1656 44 1 -3.5586 3.4210 -2.7156 45 1 -2.7144 1.6829 -1.1614 46 1 -3.0980 2.9311 0.9461 47 1 -4.2490 3.4361 -0.3140 48 1 -3.3074 5.4008 0.8705 49 1 -3.9054 5.5923 -1.5287 50 1 -2.5090 6.6234 -1.1340 51 1 -1.1377 4.3793 1.5005 52 1 -0.8926 5.9153 0.6350 53 1 -0.3005 2.1968 -1.3967 54 1 -0.7920 2.2079 0.3140 RHF calculation, no. of doubly occupied orbitals= 60 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) 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 ZINC001474420037.mol2 54 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 09:07:11 Heat of formation + Delta-G solvation = -20.902133 kcal Electronic energy + Delta-G solvation = -28871.723810 eV Core-core repulsion = 25613.790035 eV Total energy + Delta-G solvation = -3257.933775 eV No. of doubly occupied orbitals = 60 Molecular weight (most abundant/longest-lived isotopes) = 305.241 amu Computer time = 0.68 seconds Orbital eigenvalues (eV) -41.24452 -37.54297 -34.07149 -32.41637 -32.36713 -32.04499 -31.41126 -28.15599 -26.66585 -25.69199 -25.59358 -25.35446 -22.57495 -21.40468 -21.05537 -20.27078 -20.02725 -18.17664 -17.17808 -16.44402 -15.18905 -14.66651 -14.48184 -14.21624 -14.15607 -14.05307 -13.65544 -13.32410 -13.09629 -12.95796 -12.85250 -12.53661 -12.29820 -12.17188 -11.88581 -11.78559 -11.67604 -11.26890 -11.17877 -10.95257 -10.77677 -10.72755 -10.64190 -10.58639 -10.48161 -10.33715 -10.29736 -10.18159 -9.92449 -9.73178 -9.50923 -9.43491 -9.17916 -9.03864 -8.93734 -8.54878 -8.26130 -7.05613 -5.93332 -4.01132 3.28701 3.34593 3.37140 4.42761 4.80547 4.81122 4.83645 5.29519 5.35757 5.36860 5.48271 5.50349 5.54082 5.59138 5.62052 5.67391 5.74082 5.75146 5.95703 5.98336 6.04762 6.07450 6.07736 6.19059 6.23281 6.25492 6.28222 6.35033 6.41246 6.42398 6.45719 6.50571 6.52628 6.56322 6.62175 6.64958 6.72948 6.79283 6.80947 6.90462 6.97571 7.01973 7.16698 7.22963 7.26216 7.43735 7.47810 7.57992 7.71890 7.85673 8.13555 8.25988 8.41497 8.72807 9.05983 9.60935 11.05621 Molecular weight = 305.24amu Principal moments of inertia in cm(-1) A = 0.022158 B = 0.004896 C = 0.004556 Principal moments of inertia in units of 10**(-40)*gram-cm**2 A = 1263.357616 B = 5718.146404 C = 6144.586308 Net atomic charges, atomic populations, and dipole contributions calculated with CM2 Atom NO. Type Charge No. of electrons 1 C -0.152 4.152 2 C -0.110 4.110 3 C 0.212 3.788 4 H 0.045 0.955 5 C -0.545 4.545 6 H 0.069 0.931 7 C 0.065 3.935 8 N -0.887 5.887 9 Si 0.880 3.120 10 H -0.289 1.289 11 H -0.279 1.279 12 H -0.279 1.279 13 N -0.676 5.676 14 C 0.094 3.906 15 H 0.060 0.940 16 C -0.180 4.180 17 C -0.102 4.102 18 C -0.040 4.040 19 C -0.101 4.101 20 C -0.084 4.084 21 C -0.103 4.103 22 C -0.090 4.090 23 C -0.107 4.107 24 C -0.083 4.083 25 C -0.105 4.105 26 C -0.104 4.104 27 C -0.116 4.116 28 H 0.036 0.964 29 H 0.068 0.932 30 H 0.018 0.982 31 H 0.025 0.975 32 H 0.089 0.911 33 H 0.259 0.741 34 H 0.321 0.679 35 H 0.095 0.905 36 H 0.047 0.953 37 H 0.018 0.982 38 H 0.075 0.925 39 H 0.046 0.954 40 H 0.049 0.951 41 H 0.068 0.932 42 H 0.058 0.942 43 H 0.060 0.940 44 H 0.048 0.952 45 H 0.060 0.940 46 H 0.057 0.943 47 H 0.049 0.951 48 H 0.058 0.942 49 H 0.053 0.947 50 H 0.055 0.945 51 H 0.058 0.942 52 H 0.051 0.949 53 H 0.122 0.878 54 H 0.062 0.938 For the charges calculated by CM2: Dipole moment (debyes) X Y Z Total from point charges -11.195 7.944 -6.471 15.176 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 -0.209 4.209 2 C -0.148 4.148 3 C 0.104 3.896 4 H 0.062 0.938 5 C -0.584 4.584 6 H 0.086 0.914 7 C -0.137 4.137 8 N -0.525 5.525 9 Si 0.708 3.292 10 H -0.215 1.215 11 H -0.205 1.205 12 H -0.205 1.205 13 N -0.304 5.304 14 C -0.016 4.016 15 H 0.078 0.922 16 C -0.239 4.239 17 C -0.139 4.139 18 C -0.040 4.040 19 C -0.138 4.138 20 C -0.103 4.103 21 C -0.140 4.140 22 C -0.108 4.108 23 C -0.144 4.144 24 C -0.101 4.101 25 C -0.142 4.142 26 C -0.142 4.142 27 C -0.153 4.153 28 H 0.055 0.945 29 H 0.086 0.914 30 H 0.037 0.963 31 H 0.044 0.956 32 H 0.107 0.893 33 H 0.069 0.931 34 H 0.137 0.863 35 H 0.113 0.887 36 H 0.066 0.934 37 H 0.037 0.963 38 H 0.094 0.906 39 H 0.065 0.935 40 H 0.068 0.932 41 H 0.086 0.914 42 H 0.076 0.924 43 H 0.079 0.921 44 H 0.067 0.933 45 H 0.079 0.921 46 H 0.076 0.924 47 H 0.068 0.932 48 H 0.076 0.924 49 H 0.072 0.928 50 H 0.073 0.927 51 H 0.077 0.923 52 H 0.070 0.930 53 H 0.140 0.860 54 H 0.080 0.920 Dipole moment (debyes) X Y Z Total from point charges -11.854 7.907 -6.099 15.500 hybrid contribution 2.114 0.042 0.277 2.132 sum -9.740 7.948 -5.822 13.854 Atomic orbital electron populations 1.22154 0.99063 0.98646 1.01017 1.21526 0.92216 0.99588 1.01506 1.19196 0.92551 0.90692 0.87124 0.93768 1.22365 0.93471 1.37153 1.05460 0.91352 1.24912 0.97216 0.95350 0.96243 1.69863 1.34560 1.38669 1.09456 0.86856 0.86940 0.78116 0.77242 1.21463 1.20523 1.20476 1.61129 1.60210 1.01731 1.07362 1.21368 0.92838 0.90361 0.97062 0.92247 1.23063 0.97752 0.97586 1.05460 1.21731 0.93273 0.99244 0.99692 1.20305 0.94346 0.95938 0.93383 1.21630 0.94889 0.99472 0.97818 1.21032 0.95866 0.95916 0.97440 1.21480 0.99647 0.95350 0.97543 1.21139 0.97762 0.97839 0.94089 1.21534 0.98224 0.95383 0.99266 1.21014 0.96739 0.95976 0.96412 1.21511 0.99028 0.98421 0.95266 1.21611 0.94088 0.99683 0.98776 1.22360 0.93142 0.95468 1.04336 0.94461 0.91371 0.96269 0.95566 0.89301 0.93075 0.86276 0.88661 0.93412 0.96288 0.90613 0.93534 0.93247 0.91351 0.92353 0.92115 0.93288 0.92108 0.92374 0.93200 0.92358 0.92847 0.92668 0.92330 0.93015 0.86012 0.91951 Number of geometries 1 Number of calculations of the screened coulomb radii 1 The total number of SCF iterations 12. 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 -0.15 -2.94 8.49 37.15 0.32 -2.62 16 2 C -0.11 -2.47 5.45 -26.73 -0.15 -2.62 16 3 C 0.21 4.72 1.44 -68.87 -0.10 4.62 16 4 H 0.04 1.11 5.70 -51.93 -0.30 0.81 16 5 C -0.55 -13.51 5.81 -34.44 -0.20 -13.71 16 6 H 0.07 1.68 4.74 -52.49 -0.25 1.43 16 7 C 0.06 1.69 5.29 -17.82 -0.09 1.60 16 8 N -0.89 -24.29 11.29 55.43 0.63 -23.66 16 9 Si 0.88 20.70 29.54 -169.99 -5.02 15.67 16 10 H -0.29 -6.87 7.11 56.52 0.40 -6.46 16 11 H -0.28 -6.58 7.11 56.52 0.40 -6.18 16 12 H -0.28 -6.55 7.11 56.52 0.40 -6.15 16 13 N -0.68 -12.52 2.79 -100.96 -0.28 -12.80 16 14 C 0.09 1.63 2.80 -67.71 -0.19 1.44 16 15 H 0.06 0.95 5.76 -51.93 -0.30 0.66 16 16 C -0.18 -3.41 7.51 37.16 0.28 -3.13 16 17 C -0.10 -1.72 3.82 -26.73 -0.10 -1.82 16 18 C -0.04 -0.58 0.54 -154.51 -0.08 -0.67 16 19 C -0.10 -1.34 4.02 -26.73 -0.11 -1.45 16 20 C -0.08 -1.01 3.19 -90.62 -0.29 -1.30 16 21 C -0.10 -1.27 5.19 -26.73 -0.14 -1.41 16 22 C -0.09 -1.21 3.20 -90.64 -0.29 -1.50 16 23 C -0.11 -1.36 5.19 -26.72 -0.14 -1.49 16 24 C -0.08 -1.03 3.20 -90.59 -0.29 -1.32 16 25 C -0.10 -1.21 5.19 -26.73 -0.14 -1.35 16 26 C -0.10 -1.45 4.48 -26.71 -0.12 -1.57 16 27 C -0.12 -1.79 1.80 -26.76 -0.05 -1.84 16 28 H 0.04 0.74 7.25 -51.93 -0.38 0.36 16 29 H 0.07 1.22 4.36 -51.93 -0.23 1.00 16 30 H 0.02 0.34 8.14 -51.93 -0.42 -0.08 16 31 H 0.03 0.58 8.14 -51.93 -0.42 0.16 16 32 H 0.09 2.30 5.94 -51.93 -0.31 1.99 16 33 H 0.26 6.93 8.31 -40.82 -0.34 6.59 16 34 H 0.32 6.03 8.77 -39.29 -0.34 5.68 16 35 H 0.09 2.11 5.73 -51.93 -0.30 1.81 16 36 H 0.05 0.92 6.66 -51.93 -0.35 0.58 16 37 H 0.02 0.32 8.14 -51.93 -0.42 -0.11 16 38 H 0.08 1.52 5.77 -51.93 -0.30 1.22 16 39 H 0.05 0.75 8.10 -51.93 -0.42 0.33 16 40 H 0.05 0.65 8.14 -51.93 -0.42 0.22 16 41 H 0.07 0.95 6.11 -51.93 -0.32 0.64 16 42 H 0.06 0.65 8.14 -51.93 -0.42 0.23 16 43 H 0.06 0.77 8.14 -51.93 -0.42 0.34 16 44 H 0.05 0.56 8.14 -51.93 -0.42 0.14 16 45 H 0.06 0.83 8.14 -51.93 -0.42 0.41 16 46 H 0.06 0.77 8.14 -51.93 -0.42 0.35 16 47 H 0.05 0.58 8.14 -51.93 -0.42 0.16 16 48 H 0.06 0.68 8.14 -51.93 -0.42 0.26 16 49 H 0.05 0.57 8.14 -51.93 -0.42 0.15 16 50 H 0.05 0.61 8.14 -51.92 -0.42 0.19 16 51 H 0.06 0.88 8.14 -51.93 -0.42 0.45 16 52 H 0.05 0.70 8.14 -51.93 -0.42 0.27 16 53 H 0.12 2.03 4.01 -51.93 -0.21 1.82 16 54 H 0.06 1.11 5.94 -51.93 -0.31 0.80 16 LS Contribution 356.85 15.07 5.38 5.38 Total: -1.00 -24.52 356.85 -10.96 -35.48 By element: Atomic # 1 Polarization: 19.85 SS G_CDS: -9.77 Total: 10.07 kcal Atomic # 6 Polarization: -28.26 SS G_CDS: -1.88 Total: -30.14 kcal Atomic # 7 Polarization: -36.81 SS G_CDS: 0.34 Total: -36.46 kcal Atomic # 14 Polarization: 20.70 SS G_CDS: -5.02 Total: 15.67 kcal Total LS contribution 5.38 Total: 5.38 kcal Total: -24.52 -10.96 -35.48 kcal The number of atoms in the molecule is 54 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. ZINC001474420037.mol2 54 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 14.573 kcal (2) G-P(sol) polarization free energy of solvation -24.520 kcal (3) G-ENP(sol) elect.-nuc.-pol. free energy of system -9.947 kcal (4) G-CDS(sol) cavity-dispersion-solvent structure free energy -10.955 kcal (5) G-P-CDS(sol) = G-P(sol) + G-CDS(sol) = (2) + (4) -35.475 kcal (6) G-S(sol) free energy of system = (1) + (5) -20.902 kcal 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED Total computer time = 0.68 seconds