Wall clock time and date at job start Sat Apr 11 2020 06:13:18 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 1.53004 * 1 3 3 O 1.45200 * 109.46862 * 2 1 4 4 C 1.34235 * 116.99395 * 179.97438 * 3 2 1 5 5 O 1.20818 * 120.00013 * 0.02562 * 4 3 2 6 6 C 1.50703 * 119.99657 * 180.02562 * 4 3 2 7 7 N 1.46903 * 109.47167 * 183.64049 * 6 4 3 8 8 C 1.46897 * 110.99812 * 162.74614 * 7 6 4 9 9 C 1.52999 * 109.46420 * 186.24492 * 8 7 6 10 10 C 1.50705 * 109.46847 * 173.50462 * 9 8 7 11 11 O 1.21281 * 120.00018 * 0.02562 * 10 9 8 12 12 N 1.34782 * 120.00168 * 179.97438 * 10 9 8 13 13 C 1.46500 * 119.99976 * 0.02562 * 12 10 9 14 14 C 1.46495 * 119.99908 * 180.02562 * 12 10 9 15 15 C 1.50697 * 109.47250 * 90.00477 * 14 12 10 16 16 H 1.08005 * 120.00115 * 359.97438 * 15 14 12 17 17 C 1.37873 * 120.00158 * 179.97438 * 15 14 12 18 18 N 1.31515 * 119.99979 * 179.97438 * 17 15 14 19 19 Si 1.86800 * 120.00191 * 359.97438 * 17 15 14 20 20 H 1.48504 * 109.46991 * 90.00154 * 19 17 15 21 21 H 1.48495 * 109.47384 * 209.99866 * 19 17 15 22 22 H 1.48494 * 109.47055 * 330.00562 * 19 17 15 23 23 C 1.46897 * 110.99721 * 286.70107 * 7 6 4 24 24 C 1.54268 * 110.03165 * 259.17680 * 23 7 6 25 25 C 1.54966 * 104.15925 * 217.13516 * 24 23 7 26 26 C 1.54895 * 102.77708 * 37.88509 * 25 24 23 27 27 C 1.53871 * 110.03555 * 141.95856 * 23 7 6 28 28 H 1.08995 * 109.46975 * 300.00050 * 1 2 3 29 29 H 1.09005 * 109.47100 * 59.99694 * 1 2 3 30 30 H 1.08996 * 109.47118 * 179.97438 * 1 2 3 31 31 H 1.09003 * 109.46960 * 240.00593 * 2 1 3 32 32 H 1.08994 * 109.46808 * 120.00721 * 2 1 3 33 33 H 1.08999 * 109.47384 * 63.63478 * 6 4 3 34 34 H 1.09003 * 109.46681 * 303.63873 * 6 4 3 35 35 H 1.08993 * 109.47373 * 306.24303 * 8 7 6 36 36 H 1.08992 * 109.47092 * 66.25183 * 8 7 6 37 37 H 1.09003 * 109.47849 * 293.50554 * 9 8 7 38 38 H 1.09005 * 109.47355 * 53.51051 * 9 8 7 39 39 H 1.09001 * 109.47448 * 89.99275 * 13 12 10 40 40 H 1.08996 * 109.47512 * 209.99799 * 13 12 10 41 41 H 1.09007 * 109.47191 * 329.99755 * 13 12 10 42 42 H 1.09005 * 109.46935 * 210.00318 * 14 12 10 43 43 H 1.08996 * 109.47244 * 330.00227 * 14 12 10 44 44 H 0.97005 * 120.00417 * 179.97438 * 18 17 15 45 45 H 1.09012 * 110.01810 * 20.56368 * 23 7 6 46 46 H 1.09003 * 110.48364 * 335.78035 * 24 23 7 47 47 H 1.08995 * 110.48958 * 98.42684 * 24 23 7 48 48 H 1.09000 * 110.71977 * 279.57495 * 25 24 23 49 49 H 1.08998 * 110.92334 * 156.29208 * 25 24 23 50 50 H 1.08997 * 110.48771 * 203.40353 * 26 25 24 51 51 H 1.09000 * 110.59486 * 80.81550 * 26 25 24 52 52 H 1.09009 * 110.03391 * 238.57285 * 27 23 7 53 53 H 1.09005 * 110.03248 * 359.97438 * 27 23 7 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 1.5300 0.0000 0.0000 3 8 2.0140 1.3690 0.0000 4 6 3.3448 1.5448 0.0005 5 8 4.0807 0.5866 0.0005 6 6 3.9208 2.9374 0.0012 7 7 5.3852 2.8616 -0.0863 8 6 5.9556 4.1520 -0.4954 9 6 7.4599 3.9943 -0.7261 10 6 8.0171 5.2726 -1.2977 11 8 7.2834 6.2169 -1.5002 12 7 9.3310 5.3669 -1.5830 13 6 10.2174 4.2265 -1.3380 14 6 9.8726 6.6097 -2.1381 15 6 10.3096 7.5134 -1.0142 16 1 10.1949 7.1941 0.0112 17 6 10.8559 8.7478 -1.2948 18 7 11.2367 9.5367 -0.3139 19 14 11.0550 9.2998 -3.0682 20 1 9.8308 10.0192 -3.5032 21 1 12.2263 10.2062 -3.1760 22 1 11.2660 8.1129 -3.9353 23 6 5.9657 2.4087 1.1849 24 6 6.5199 3.6142 1.9720 25 6 7.8078 3.0706 2.6408 26 6 8.3946 2.1414 1.5493 27 6 7.1569 1.4724 0.9165 28 1 -0.3633 0.5138 0.8899 29 1 -0.3633 0.5139 -0.8900 30 1 -0.3633 -1.0276 -0.0005 31 1 1.8934 -0.5138 -0.8901 32 1 1.8933 -0.5139 0.8899 33 1 3.6376 3.4473 0.9219 34 1 3.5339 3.4909 -0.8544 35 1 5.4794 4.4836 -1.4180 36 1 5.7836 4.8900 0.2880 37 1 7.9519 3.7753 0.2216 38 1 7.6366 3.1766 -1.4248 39 1 10.2555 3.5981 -2.2278 40 1 11.2189 4.5882 -1.1054 41 1 9.8372 3.6446 -0.4983 42 1 10.7280 6.3811 -2.7740 43 1 9.1044 7.1092 -2.7283 44 1 11.6214 10.4051 -0.5112 45 1 5.2103 1.8917 1.7768 46 1 6.7589 4.4345 1.2951 47 1 5.8043 3.9381 2.7276 48 1 7.5657 2.5047 3.5404 49 1 8.4991 3.8813 2.8704 50 1 9.0466 1.3914 1.9969 51 1 8.9378 2.7216 0.8033 52 1 6.9801 0.5012 1.3789 53 1 7.3041 1.3537 -0.1570 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 ZINC000357013127.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 06:13:18 Heat of formation + Delta-G solvation = -93.694505 kcal Electronic energy + Delta-G solvation = -31423.990433 eV Core-core repulsion = 27296.965276 eV Total energy + Delta-G solvation = -4127.025157 eV No. of doubly occupied orbitals = 66 Molecular weight (most abundant/longest-lived isotopes) = 340.220 amu Computer time = 0.72 seconds Orbital eigenvalues (eV) -40.92116 -40.01380 -38.58338 -36.80558 -35.29797 -34.78914 -32.61370 -32.17779 -31.45609 -28.94616 -28.73318 -28.21937 -26.41232 -25.65013 -23.73416 -23.05030 -21.71434 -21.18350 -20.80652 -19.24833 -18.47258 -17.85911 -17.04357 -16.95147 -16.87048 -16.42228 -16.16778 -15.61529 -15.31031 -14.86433 -14.65823 -14.50926 -14.29237 -13.74982 -13.67491 -13.38899 -13.15474 -12.92155 -12.80495 -12.63609 -12.45241 -12.23664 -12.11133 -12.00273 -11.92458 -11.85347 -11.60745 -11.37029 -11.15313 -11.10780 -11.03323 -10.92140 -10.81385 -10.72442 -10.59231 -10.50237 -10.38501 -10.21307 -10.13049 -9.53681 -8.96981 -8.58409 -8.44420 -7.68161 -6.08319 -4.06827 2.07265 2.30154 3.29656 3.35633 3.37492 3.38127 3.60299 4.02263 4.40127 4.45141 4.55439 4.57086 4.57819 4.64988 4.81167 4.90580 4.93018 5.02230 5.09328 5.18986 5.21562 5.26329 5.30979 5.34581 5.39692 5.40287 5.48876 5.57196 5.59559 5.62309 5.69393 5.77136 5.85635 5.90655 5.93299 5.96803 6.02194 6.14077 6.18065 6.21599 6.28230 6.29217 6.41084 6.71233 6.84427 6.93808 6.97043 7.35219 7.61874 7.64190 8.26733 8.47634 8.93277 9.00218 9.52224 11.04992 Molecular weight = 340.22amu Principal moments of inertia in cm(-1) A = 0.017692 B = 0.002536 C = 0.002375 Principal moments of inertia in units of 10**(-40)*gram-cm**2 A = 1582.277219 B =11039.697498 C =11787.536879 Net atomic charges, atomic populations, and dipole contributions calculated with CM2 Atom NO. Type Charge No. of electrons 1 C -0.153 4.153 2 C 0.064 3.936 3 O -0.364 6.364 4 C 0.461 3.539 5 O -0.486 6.486 6 C 0.061 3.939 7 N -0.521 5.521 8 C 0.068 3.932 9 C -0.158 4.158 10 C 0.507 3.493 11 O -0.546 6.546 12 N -0.598 5.598 13 C 0.082 3.918 14 C 0.215 3.785 15 C -0.527 4.527 16 H 0.074 0.926 17 C 0.071 3.929 18 N -0.898 5.898 19 Si 0.877 3.123 20 H -0.274 1.274 21 H -0.285 1.285 22 H -0.266 1.266 23 C 0.085 3.915 24 C -0.182 4.182 25 C -0.122 4.122 26 C -0.138 4.138 27 C -0.106 4.106 28 H 0.066 0.934 29 H 0.067 0.933 30 H 0.078 0.922 31 H 0.069 0.931 32 H 0.068 0.932 33 H 0.080 0.920 34 H 0.117 0.883 35 H 0.086 0.914 36 H 0.059 0.941 37 H 0.113 0.887 38 H 0.095 0.905 39 H 0.046 0.954 40 H 0.075 0.925 41 H 0.060 0.940 42 H 0.029 0.971 43 H 0.036 0.964 44 H 0.264 0.736 45 H 0.071 0.929 46 H 0.102 0.898 47 H 0.062 0.938 48 H 0.064 0.936 49 H 0.070 0.930 50 H 0.065 0.935 51 H 0.075 0.925 52 H 0.062 0.938 53 H 0.079 0.921 For the charges calculated by CM2: Dipole moment (debyes) X Y Z Total from point charges -15.613 -20.730 3.069 26.133 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 -0.210 4.210 2 C -0.010 4.010 3 O -0.282 6.282 4 C 0.302 3.698 5 O -0.372 6.372 6 C -0.068 4.068 7 N -0.245 5.245 8 C -0.059 4.059 9 C -0.198 4.198 10 C 0.294 3.706 11 O -0.424 6.424 12 N -0.329 5.329 13 C -0.062 4.062 14 C 0.094 3.906 15 C -0.565 4.565 16 H 0.092 0.908 17 C -0.131 4.131 18 N -0.536 5.536 19 Si 0.704 3.296 20 H -0.199 1.199 21 H -0.211 1.211 22 H -0.191 1.191 23 C -0.023 4.023 24 C -0.220 4.220 25 C -0.160 4.160 26 C -0.175 4.175 27 C -0.144 4.144 28 H 0.085 0.915 29 H 0.086 0.914 30 H 0.097 0.903 31 H 0.088 0.912 32 H 0.086 0.914 33 H 0.098 0.902 34 H 0.135 0.865 35 H 0.105 0.895 36 H 0.077 0.923 37 H 0.130 0.870 38 H 0.113 0.887 39 H 0.064 0.936 40 H 0.094 0.906 41 H 0.079 0.921 42 H 0.047 0.953 43 H 0.054 0.946 44 H 0.074 0.926 45 H 0.089 0.911 46 H 0.120 0.880 47 H 0.081 0.919 48 H 0.083 0.917 49 H 0.089 0.911 50 H 0.084 0.916 51 H 0.093 0.907 52 H 0.081 0.919 53 H 0.097 0.903 Dipole moment (debyes) X Y Z Total from point charges -15.592 -20.728 2.615 26.069 hybrid contribution 0.050 0.747 -0.140 0.762 sum -15.541 -19.981 2.475 25.434 Atomic orbital electron populations 1.21809 0.92686 1.02925 1.03559 1.22981 0.95254 0.80258 1.02536 1.86495 1.24823 1.32383 1.84466 1.23664 0.80352 0.92887 0.72933 1.90665 1.60130 1.42674 1.43682 1.21563 0.89872 0.90554 1.04776 1.61911 1.01802 1.29658 1.31145 1.21950 0.94333 0.88211 1.01359 1.22251 0.96044 0.97277 1.04193 1.20357 0.82389 0.89058 0.78802 1.90658 1.58081 1.40000 1.53642 1.47811 1.07017 1.15131 1.62984 1.21723 0.95961 0.88755 0.99795 1.19659 0.93993 0.81866 0.95085 1.21320 1.40607 1.00613 0.93984 0.90800 1.24865 0.94903 0.96184 0.97158 1.69899 1.42235 1.10076 1.31430 0.86842 0.78089 0.79169 0.85535 1.19935 1.21111 1.19077 1.22380 0.96987 0.94978 0.87939 1.23552 0.98170 0.99908 1.00393 1.22430 0.96626 0.99062 0.97840 1.22671 0.97790 0.98834 0.98239 1.22126 0.92744 0.97524 1.02020 0.91503 0.91422 0.90291 0.91231 0.91390 0.90234 0.86508 0.89540 0.92346 0.86965 0.88662 0.93570 0.90589 0.92094 0.95295 0.94571 0.92599 0.91077 0.88034 0.91899 0.91726 0.91148 0.91581 0.90667 0.91924 0.90264 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 -0.80 10.29 37.16 0.38 -0.42 16 2 C 0.06 0.49 6.19 37.16 0.23 0.72 16 3 O -0.36 -3.59 10.22 -39.27 -0.40 -3.99 16 4 C 0.46 5.09 7.51 36.01 0.27 5.36 16 5 O -0.49 -6.57 15.12 -18.74 -0.28 -6.85 16 6 C 0.06 0.61 5.45 -4.97 -0.03 0.58 16 7 N -0.52 -6.06 3.95 -226.75 -0.90 -6.96 16 8 C 0.07 0.91 3.79 -3.83 -0.01 0.90 16 9 C -0.16 -2.27 2.53 -27.88 -0.07 -2.34 16 10 C 0.51 10.07 7.67 -10.98 -0.08 9.99 16 11 O -0.55 -13.01 15.47 5.56 0.09 -12.92 16 12 N -0.60 -12.20 2.86 -182.95 -0.52 -12.72 16 13 C 0.08 1.25 10.24 59.85 0.61 1.86 16 14 C 0.21 5.25 4.23 -5.20 -0.02 5.23 16 15 C -0.53 -15.07 9.94 -34.44 -0.34 -15.42 16 16 H 0.07 2.31 8.06 -52.48 -0.42 1.89 16 17 C 0.07 2.07 5.47 -17.82 -0.10 1.97 16 18 N -0.90 -27.62 13.96 55.43 0.77 -26.85 16 19 Si 0.88 21.61 27.47 -169.99 -4.67 16.94 16 20 H -0.27 -6.79 7.11 56.52 0.40 -6.39 16 21 H -0.29 -6.90 7.11 56.52 0.40 -6.50 16 22 H -0.27 -6.18 6.54 56.52 0.37 -5.81 16 23 C 0.09 0.96 2.14 -66.60 -0.14 0.81 16 24 C -0.18 -2.08 5.28 -25.03 -0.13 -2.22 16 25 C -0.12 -1.31 6.74 -24.69 -0.17 -1.48 16 26 C -0.14 -1.43 6.12 -25.07 -0.15 -1.59 16 27 C -0.11 -1.16 5.77 -25.62 -0.15 -1.31 16 28 H 0.07 0.34 8.14 -51.93 -0.42 -0.08 16 29 H 0.07 0.36 8.14 -51.93 -0.42 -0.07 16 30 H 0.08 0.28 8.14 -51.93 -0.42 -0.14 16 31 H 0.07 0.55 8.13 -51.93 -0.42 0.12 16 32 H 0.07 0.52 8.13 -51.93 -0.42 0.10 16 33 H 0.08 0.68 8.03 -51.93 -0.42 0.26 16 34 H 0.12 1.01 7.84 -51.93 -0.41 0.60 16 35 H 0.09 1.21 7.70 -51.93 -0.40 0.81 16 36 H 0.06 0.82 5.96 -51.93 -0.31 0.51 16 37 H 0.11 1.51 1.91 -51.93 -0.10 1.41 16 38 H 0.10 1.25 7.69 -51.93 -0.40 0.85 16 39 H 0.05 0.60 8.14 -51.93 -0.42 0.17 16 40 H 0.08 1.21 8.07 -51.93 -0.42 0.79 16 41 H 0.06 0.78 4.74 -51.93 -0.25 0.53 16 42 H 0.03 0.68 7.13 -51.93 -0.37 0.31 16 43 H 0.04 0.95 6.85 -51.93 -0.36 0.59 16 44 H 0.26 7.60 8.31 -40.82 -0.34 7.26 16 45 H 0.07 0.81 6.89 -51.92 -0.36 0.46 16 46 H 0.10 1.36 3.47 -51.93 -0.18 1.18 16 47 H 0.06 0.67 8.14 -51.93 -0.42 0.25 16 48 H 0.06 0.63 8.14 -51.93 -0.42 0.21 16 49 H 0.07 0.82 8.14 -51.93 -0.42 0.39 16 50 H 0.07 0.61 8.14 -51.93 -0.42 0.19 16 51 H 0.08 0.82 4.19 -51.93 -0.22 0.60 16 52 H 0.06 0.68 8.14 -51.92 -0.42 0.26 16 53 H 0.08 0.94 7.17 -51.93 -0.37 0.57 16 LS Contribution 402.73 15.07 6.07 6.07 Total: -1.00 -34.78 402.73 -8.54 -43.32 By element: Atomic # 1 Polarization: 10.10 SS G_CDS: -8.79 Total: 1.31 kcal Atomic # 6 Polarization: 2.56 SS G_CDS: 0.09 Total: 2.65 kcal Atomic # 7 Polarization: -45.88 SS G_CDS: -0.65 Total: -46.53 kcal Atomic # 8 Polarization: -23.17 SS G_CDS: -0.60 Total: -23.77 kcal Atomic # 14 Polarization: 21.61 SS G_CDS: -4.67 Total: 16.94 kcal Total LS contribution 6.07 Total: 6.07 kcal Total: -34.78 -8.54 -43.32 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. ZINC000357013127.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 -50.378 kcal (2) G-P(sol) polarization free energy of solvation -34.776 kcal (3) G-ENP(sol) elect.-nuc.-pol. free energy of system -85.154 kcal (4) G-CDS(sol) cavity-dispersion-solvent structure free energy -8.540 kcal (5) G-P-CDS(sol) = G-P(sol) + G-CDS(sol) = (2) + (4) -43.316 kcal (6) G-S(sol) free energy of system = (1) + (5) -93.695 kcal 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED Total computer time = 0.72 seconds