Wall clock time and date at job start Tue Mar 31 2020 21:18:25 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 C 2 2 C 1.31002 * 1 3 3 C 1.50693 * 120.00102 * 2 1 4 4 C 1.53000 * 109.47040 * 124.06634 * 3 2 1 5 5 C 1.50705 * 109.54308 * 183.78587 * 4 3 2 6 6 O 1.21282 * 119.99840 * 113.05664 * 5 4 3 7 7 N 1.34778 * 119.99965 * 293.05885 * 5 4 3 8 8 C 1.46498 * 119.99512 * 174.89248 * 7 5 4 9 9 H 1.08996 * 109.49931 * 34.93825 * 8 7 5 10 10 C 1.53040 * 109.49543 * 274.83235 * 8 7 5 11 11 C 1.53041 * 109.54116 * 301.41872 * 10 8 7 12 12 C 1.53198 * 109.31083 * 298.63418 * 11 10 8 13 13 N 1.46925 * 108.77359 * 54.63743 * 12 11 10 14 14 C 1.36939 * 120.63291 * 126.41132 * 13 12 11 15 15 H 1.07999 * 120.00040 * 211.57026 * 14 13 12 16 16 C 1.38819 * 119.99596 * 31.56932 * 14 13 12 17 17 N 1.31618 * 120.00128 * 13.38767 * 16 14 13 18 18 Si 1.86800 * 119.99900 * 193.38345 * 16 14 13 19 19 H 1.48496 * 109.47333 * 60.00012 * 18 16 14 20 20 H 1.48491 * 109.47078 * 180.02562 * 18 16 14 21 21 H 1.48499 * 109.46997 * 300.00052 * 18 16 14 22 22 C 1.46926 * 118.73848 * 306.38733 * 13 12 11 23 23 H 1.09003 * 109.58550 * 293.82060 * 22 13 12 24 24 C 1.53000 * 109.70354 * 173.46814 * 22 13 12 25 25 C 1.53182 * 109.54444 * 63.52089 * 4 3 2 26 26 C 1.53095 * 109.16219 * 183.15415 * 25 4 3 27 27 O 1.42906 * 109.41609 * 57.60732 * 26 25 4 28 28 C 1.42904 * 114.09657 * 298.83968 * 27 26 25 29 29 C 1.53089 * 109.41435 * 61.16045 * 28 27 26 30 30 H 1.08000 * 120.00156 * 179.97438 * 1 2 3 31 31 H 1.07997 * 119.99928 * 359.72533 * 1 2 3 32 32 H 1.08003 * 119.99680 * 180.02562 * 2 1 3 33 33 H 1.08999 * 109.47019 * 244.06593 * 3 2 1 34 34 H 1.09000 * 109.47471 * 4.06481 * 3 2 1 35 35 H 0.96999 * 119.99762 * 354.89007 * 7 5 4 36 36 H 1.08997 * 109.45500 * 61.44099 * 10 8 7 37 37 H 1.08999 * 109.45503 * 181.39793 * 10 8 7 38 38 H 1.08994 * 109.49450 * 178.68875 * 11 10 8 39 39 H 1.08995 * 109.49639 * 58.58726 * 11 10 8 40 40 H 1.08999 * 109.58501 * 294.84741 * 12 11 10 41 41 H 1.08998 * 109.70040 * 174.49074 * 12 11 10 42 42 H 0.97001 * 120.00281 * 180.02562 * 17 16 14 43 43 H 1.08996 * 109.47089 * 300.64342 * 24 22 13 44 44 H 1.09010 * 109.47139 * 60.63945 * 24 22 13 45 45 H 1.09000 * 109.47505 * 180.63878 * 24 22 13 46 46 H 1.09003 * 109.51821 * 303.05639 * 25 4 3 47 47 H 1.08997 * 109.52407 * 63.24605 * 25 4 3 48 48 H 1.09000 * 109.48133 * 297.62269 * 26 25 4 49 49 H 1.08995 * 109.47611 * 177.58729 * 26 25 4 50 50 H 1.08997 * 109.48124 * 301.17829 * 28 27 26 51 51 H 1.08999 * 109.48799 * 181.14667 * 28 27 26 52 52 H 1.08998 * 109.52375 * 182.48504 * 29 28 27 53 53 H 1.09003 * 109.57841 * 62.32295 * 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 6 1.3100 0.0000 0.0000 3 6 2.0635 1.3050 0.0000 4 6 3.0183 1.3427 1.1950 5 6 3.7045 2.6833 1.2499 6 8 3.4750 3.4449 2.1654 7 7 4.5733 3.0358 0.2817 8 6 5.1549 4.3803 0.2737 9 1 5.3125 4.7147 1.2990 10 6 4.2031 5.3444 -0.4383 11 6 3.9555 4.8569 -1.8677 12 6 5.2827 4.8349 -2.6325 13 7 6.2498 4.0260 -1.8781 14 6 6.9100 2.9875 -2.4790 15 1 7.1934 2.1208 -1.9003 16 6 7.2148 3.0489 -3.8319 17 7 7.1139 4.1911 -4.4781 18 14 7.7685 1.5105 -4.7353 19 1 6.7038 0.4785 -4.6539 20 1 8.0312 1.8401 -6.1591 21 1 9.0111 0.9899 -4.1107 22 6 6.4957 4.3529 -0.4670 23 1 6.9724 5.3305 -0.3960 24 6 7.4049 3.2924 0.1573 25 6 4.0657 0.2344 1.0491 26 6 4.9674 0.2293 2.2863 27 8 4.1676 0.0466 3.4564 28 6 3.2021 1.0782 3.6701 29 6 2.2294 1.1174 2.4885 30 1 -0.5400 -0.9353 -0.0004 31 1 -0.5400 0.9353 0.0045 32 1 1.8500 -0.9354 -0.0004 33 1 2.6344 1.3949 -0.9242 34 1 1.3575 2.1323 0.0728 35 1 4.8134 2.3993 -0.4097 36 1 3.2567 5.3844 0.1009 37 1 4.6476 6.3392 -0.4657 38 1 3.2594 5.5311 -2.3665 39 1 3.5340 3.8521 -1.8415 40 1 5.6604 5.8519 -2.7381 41 1 5.1310 4.3971 -3.6191 42 1 7.3265 4.2339 -5.4235 43 1 6.9287 2.3150 0.0808 44 1 8.3582 3.2745 -0.3710 45 1 7.5756 3.5323 1.2068 46 1 3.5655 -0.7298 0.9590 47 1 4.6685 0.4177 0.1597 48 1 5.4980 1.1791 2.3534 49 1 5.6877 -0.5849 2.2076 50 1 3.7095 2.0391 3.7552 51 1 2.6507 0.8757 4.5882 52 1 1.5190 1.9322 2.6284 53 1 1.6912 0.1715 2.4269 RHF calculation, no. of doubly occupied orbitals= 65 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 ZINC001486186402.mol2 53 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 21:18:25 Heat of formation + Delta-G solvation = -54.820338 kcal Electronic energy + Delta-G solvation = -32677.114940 eV Core-core repulsion = 28742.231545 eV Total energy + Delta-G solvation = -3934.883395 eV No. of doubly occupied orbitals = 65 Molecular weight (most abundant/longest-lived isotopes) = 336.220 amu Computer time = 1.20 seconds Orbital eigenvalues (eV) -40.94366 -38.76231 -37.32408 -36.04158 -34.02340 -32.83795 -32.32185 -31.70838 -30.94014 -29.40433 -27.82591 -26.33088 -25.06479 -23.96387 -23.63118 -22.45538 -21.59226 -20.80904 -19.98752 -18.96199 -18.73300 -16.71072 -16.50614 -16.22276 -15.98750 -15.47437 -15.18096 -15.04777 -14.81030 -14.51185 -14.23584 -14.02566 -13.83838 -13.50442 -13.25709 -13.05437 -12.94931 -12.62459 -12.51921 -12.26311 -12.21361 -11.88862 -11.75505 -11.40276 -11.28338 -11.27579 -11.11450 -11.00997 -10.76946 -10.68374 -10.59280 -10.56528 -10.44329 -10.16777 -10.06785 -9.71575 -9.60074 -9.41506 -9.35884 -9.15710 -8.57643 -8.47366 -6.69613 -5.86687 -3.34795 2.15822 2.92069 3.30409 3.36506 3.37971 3.55409 3.92135 4.39593 4.48660 4.58723 4.72033 4.93560 4.98399 5.09803 5.15255 5.25692 5.26953 5.29051 5.52343 5.52595 5.54325 5.57566 5.59290 5.61792 5.70334 5.74285 5.80489 5.84638 5.89275 5.92394 6.02575 6.07058 6.09573 6.16718 6.19485 6.29986 6.37794 6.48031 6.51984 6.62704 6.63262 6.65831 6.73531 6.89486 6.92875 7.07963 7.22752 7.32092 7.60984 7.71643 7.98577 8.37792 8.58370 9.12982 9.75106 10.33717 11.21091 Molecular weight = 336.22amu Principal moments of inertia in cm(-1) A = 0.011873 B = 0.004374 C = 0.004183 Principal moments of inertia in units of 10**(-40)*gram-cm**2 A = 2357.692632 B = 6399.371837 C = 6692.264714 Net atomic charges, atomic populations, and dipole contributions calculated with CM2 Atom NO. Type Charge No. of electrons 1 C -0.197 4.197 2 C -0.142 4.142 3 C -0.081 4.081 4 C -0.072 4.072 5 C 0.519 3.481 6 O -0.552 6.552 7 N -0.697 5.697 8 C 0.132 3.868 9 H 0.076 0.924 10 C -0.120 4.120 11 C -0.139 4.139 12 C 0.173 3.827 13 N -0.584 5.584 14 C -0.258 4.258 15 H 0.068 0.932 16 C 0.010 3.990 17 N -0.899 5.899 18 Si 0.899 3.101 19 H -0.284 1.284 20 H -0.291 1.291 21 H -0.283 1.283 22 C 0.159 3.841 23 H 0.038 0.962 24 C -0.134 4.134 25 C -0.147 4.147 26 C 0.059 3.941 27 O -0.386 6.386 28 C 0.052 3.948 29 C -0.125 4.125 30 H 0.096 0.904 31 H 0.095 0.905 32 H 0.111 0.889 33 H 0.083 0.917 34 H 0.072 0.928 35 H 0.408 0.592 36 H 0.048 0.952 37 H 0.062 0.938 38 H 0.046 0.954 39 H 0.052 0.948 40 H 0.018 0.982 41 H 0.084 0.916 42 H 0.254 0.746 43 H 0.052 0.948 44 H 0.063 0.937 45 H 0.038 0.962 46 H 0.083 0.917 47 H 0.082 0.918 48 H 0.052 0.948 49 H 0.095 0.905 50 H 0.070 0.930 51 H 0.088 0.912 52 H 0.078 0.922 53 H 0.076 0.924 For the charges calculated by CM2: Dipole moment (debyes) X Y Z Total from point charges -9.196 -6.199 10.119 15.013 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 -0.234 4.234 2 C -0.160 4.160 3 C -0.119 4.119 4 C -0.075 4.075 5 C 0.304 3.696 6 O -0.431 6.431 7 N -0.348 5.348 8 C 0.026 3.974 9 H 0.094 0.906 10 C -0.158 4.158 11 C -0.179 4.179 12 C 0.047 3.953 13 N -0.308 5.308 14 C -0.388 4.388 15 H 0.085 0.915 16 C -0.190 4.190 17 N -0.542 5.542 18 Si 0.729 3.271 19 H -0.210 1.210 20 H -0.217 1.217 21 H -0.209 1.209 22 C 0.052 3.948 23 H 0.056 0.944 24 C -0.192 4.192 25 C -0.185 4.185 26 C -0.018 4.018 27 O -0.304 6.304 28 C -0.024 4.024 29 C -0.162 4.162 30 H 0.114 0.886 31 H 0.113 0.887 32 H 0.129 0.871 33 H 0.102 0.898 34 H 0.091 0.909 35 H 0.245 0.755 36 H 0.066 0.934 37 H 0.080 0.920 38 H 0.065 0.935 39 H 0.071 0.929 40 H 0.036 0.964 41 H 0.102 0.898 42 H 0.065 0.935 43 H 0.071 0.929 44 H 0.082 0.918 45 H 0.057 0.943 46 H 0.101 0.899 47 H 0.100 0.900 48 H 0.070 0.930 49 H 0.113 0.887 50 H 0.088 0.912 51 H 0.106 0.894 52 H 0.097 0.903 53 H 0.094 0.906 Dipole moment (debyes) X Y Z Total from point charges -9.263 -5.746 10.671 15.254 hybrid contribution 0.314 -0.706 -1.293 1.506 sum -8.949 -6.452 9.378 14.480 Atomic orbital electron populations 1.23824 0.95897 1.01721 1.01930 1.22858 0.95899 0.98181 0.99051 1.20757 0.97832 0.96135 0.97156 1.20828 0.96077 0.93275 0.97310 1.20342 0.79382 0.87877 0.81971 1.90615 1.64115 1.53787 1.34580 1.46029 1.44128 1.15810 1.28784 1.21540 0.94936 0.81658 0.99271 0.90640 1.21760 0.98682 0.98473 0.96928 1.22138 1.00482 0.99849 0.95410 1.20768 0.84960 0.94270 0.95279 1.44107 1.45419 1.35963 1.05324 1.19048 1.32432 0.94936 0.92363 0.91471 1.25152 0.99111 0.96204 0.98519 1.69990 1.51643 1.23205 1.09369 0.86439 0.78735 0.82954 0.78986 1.20994 1.21695 1.20878 1.20717 0.90723 0.96846 0.86513 0.94425 1.21769 1.00444 0.98977 0.97993 1.22347 0.97582 0.98931 0.99656 1.22575 0.92731 1.02024 0.84431 1.87880 1.50254 1.48247 1.44062 1.22748 0.90240 0.92087 0.97342 1.22005 0.98324 1.02691 0.93227 0.88587 0.88682 0.87113 0.89817 0.90936 0.75545 0.93360 0.91955 0.93542 0.92898 0.96421 0.89764 0.93545 0.92914 0.91771 0.94269 0.89851 0.89975 0.93014 0.88659 0.91152 0.89377 0.90347 0.90578 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 C -0.20 -1.84 14.32 29.01 0.42 -1.42 16 2 C -0.14 -1.43 7.48 -36.03 -0.27 -1.70 16 3 C -0.08 -0.94 4.72 -27.89 -0.13 -1.07 16 4 C -0.07 -0.88 0.44 -155.47 -0.07 -0.95 16 5 C 0.52 7.85 5.01 -10.98 -0.06 7.80 16 6 O -0.55 -9.81 13.77 5.56 0.08 -9.74 16 7 N -0.70 -10.86 3.34 -53.69 -0.18 -11.04 16 8 C 0.13 2.25 2.37 -67.81 -0.16 2.09 16 9 H 0.08 1.32 7.51 -51.93 -0.39 0.93 16 10 C -0.12 -2.04 5.58 -26.69 -0.15 -2.19 16 11 C -0.14 -2.52 5.93 -26.61 -0.16 -2.68 16 12 C 0.17 3.80 5.26 -3.71 -0.02 3.78 16 13 N -0.58 -12.86 2.64 -164.77 -0.43 -13.29 16 14 C -0.26 -6.23 8.54 -15.06 -0.13 -6.35 16 15 H 0.07 1.57 6.29 -52.49 -0.33 1.24 16 16 C 0.01 0.25 4.98 -17.43 -0.09 0.16 16 17 N -0.90 -24.49 11.23 55.49 0.62 -23.87 16 18 Si 0.90 20.28 29.57 -169.99 -5.03 15.25 16 19 H -0.28 -6.29 7.11 56.52 0.40 -5.89 16 20 H -0.29 -6.76 7.11 56.52 0.40 -6.36 16 21 H -0.28 -6.35 7.11 56.52 0.40 -5.95 16 22 C 0.16 3.02 3.19 -67.60 -0.22 2.81 16 23 H 0.04 0.76 8.14 -51.93 -0.42 0.34 16 24 C -0.13 -2.33 7.75 37.16 0.29 -2.05 16 25 C -0.15 -1.69 4.65 -26.59 -0.12 -1.81 16 26 C 0.06 0.73 6.62 37.21 0.25 0.98 16 27 O -0.39 -5.23 10.77 -35.23 -0.38 -5.61 16 28 C 0.05 0.67 6.56 37.20 0.24 0.91 16 29 C -0.12 -1.49 4.31 -26.59 -0.11 -1.61 16 30 H 0.10 0.77 8.06 -52.49 -0.42 0.35 16 31 H 0.09 0.87 7.84 -52.49 -0.41 0.46 16 32 H 0.11 1.04 6.88 -52.48 -0.36 0.68 16 33 H 0.08 1.03 8.14 -51.93 -0.42 0.61 16 34 H 0.07 0.88 7.79 -51.93 -0.40 0.47 16 35 H 0.41 6.55 6.65 -40.82 -0.27 6.28 16 36 H 0.05 0.82 8.14 -51.93 -0.42 0.40 16 37 H 0.06 1.05 8.14 -51.93 -0.42 0.62 16 38 H 0.05 0.79 8.14 -51.93 -0.42 0.36 16 39 H 0.05 0.96 7.53 -51.93 -0.39 0.57 16 40 H 0.02 0.42 8.14 -51.93 -0.42 0.00 16 41 H 0.08 2.09 6.21 -51.93 -0.32 1.77 16 42 H 0.25 6.82 8.31 -40.82 -0.34 6.48 16 43 H 0.05 0.89 6.38 -51.93 -0.33 0.56 16 44 H 0.06 1.21 7.69 -51.92 -0.40 0.81 16 45 H 0.04 0.60 8.14 -51.93 -0.42 0.18 16 46 H 0.08 0.86 6.57 -51.93 -0.34 0.52 16 47 H 0.08 0.95 7.05 -51.93 -0.37 0.58 16 48 H 0.05 0.71 7.38 -51.93 -0.38 0.32 16 49 H 0.10 1.02 8.14 -51.93 -0.42 0.60 16 50 H 0.07 1.05 6.07 -51.93 -0.32 0.73 16 51 H 0.09 0.97 8.14 -51.93 -0.42 0.55 16 52 H 0.08 0.98 7.93 -51.93 -0.41 0.57 16 53 H 0.08 0.84 7.00 -51.93 -0.36 0.48 16 LS Contribution 392.75 15.07 5.92 5.92 Total: -1.00 -27.40 392.75 -9.05 -36.45 By element: Atomic # 1 Polarization: 18.41 SS G_CDS: -9.16 Total: 9.25 kcal Atomic # 6 Polarization: -2.83 SS G_CDS: -0.49 Total: -3.32 kcal Atomic # 7 Polarization: -48.21 SS G_CDS: 0.01 Total: -48.20 kcal Atomic # 8 Polarization: -15.05 SS G_CDS: -0.30 Total: -15.35 kcal Atomic # 14 Polarization: 20.28 SS G_CDS: -5.03 Total: 15.25 kcal Total LS contribution 5.92 Total: 5.92 kcal Total: -27.40 -9.05 -36.45 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. ZINC001486186402.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 -18.373 kcal (2) G-P(sol) polarization free energy of solvation -27.401 kcal (3) G-ENP(sol) elect.-nuc.-pol. free energy of system -45.774 kcal (4) G-CDS(sol) cavity-dispersion-solvent structure free energy -9.046 kcal (5) G-P-CDS(sol) = G-P(sol) + G-CDS(sol) = (2) + (4) -36.447 kcal (6) G-S(sol) free energy of system = (1) + (5) -54.820 kcal 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED Total computer time = 1.20 seconds