Wall clock time and date at job start Sat Apr 11 2020 06:11:07 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 1.52999 * 1 3 3 C 1.52999 * 109.47140 * 2 1 4 4 C 1.52999 * 109.47152 * 120.00380 * 2 1 3 5 5 N 1.46893 * 109.47574 * 62.09642 * 4 2 1 6 6 C 1.46852 * 111.00353 * 176.26919 * 5 4 2 7 7 C 1.53041 * 109.52117 * 174.16209 * 6 5 4 8 8 C 1.53118 * 109.27776 * 59.18228 * 7 6 5 9 9 C 1.53000 * 109.51928 * 182.37149 * 8 7 6 10 10 N 1.46504 * 115.54915 * 34.21019 * 9 8 7 11 11 C 1.34781 * 119.99820 * 179.97438 * 10 9 8 12 12 O 1.21282 * 120.00120 * 359.97438 * 11 10 9 13 13 C 1.50701 * 119.99673 * 179.97438 * 11 10 9 14 14 S 1.80999 * 109.46744 * 179.97438 * 13 11 10 15 15 C 1.76193 * 99.99948 * 180.02562 * 14 13 11 16 16 H 1.08000 * 120.00227 * 359.97438 * 15 14 13 17 17 C 1.38798 * 120.00166 * 180.02562 * 15 14 13 18 18 N 1.31634 * 120.00013 * 359.97438 * 17 15 14 19 19 Si 1.86807 * 120.00207 * 179.97438 * 17 15 14 20 20 H 1.48506 * 109.46964 * 0.02562 * 19 17 15 21 21 H 1.48498 * 109.47323 * 119.99732 * 19 17 15 22 22 H 1.48496 * 109.46933 * 239.99923 * 19 17 15 23 23 C 1.53000 * 117.50283 * 248.49500 * 9 8 7 24 24 C 1.53002 * 60.00188 * 252.51482 * 23 9 8 25 25 C 1.53115 * 109.21701 * 302.31231 * 8 7 6 26 26 C 1.46858 * 110.99795 * 52.06422 * 5 4 2 27 27 H 1.08998 * 109.46892 * 299.99374 * 1 2 3 28 28 H 1.08999 * 109.46791 * 59.99857 * 1 2 3 29 29 H 1.09004 * 109.46902 * 179.97438 * 1 2 3 30 30 H 1.09002 * 109.47497 * 239.99940 * 2 1 3 31 31 H 1.08998 * 109.47204 * 179.97438 * 3 2 1 32 32 H 1.09000 * 109.47163 * 300.00268 * 3 2 1 33 33 H 1.09004 * 109.47124 * 60.00386 * 3 2 1 34 34 H 1.09004 * 109.47186 * 302.09712 * 4 2 1 35 35 H 1.09002 * 109.47067 * 182.10079 * 4 2 1 36 36 H 1.08998 * 109.45664 * 54.15160 * 6 5 4 37 37 H 1.08996 * 109.46438 * 294.18096 * 6 5 4 38 38 H 1.08995 * 109.50427 * 299.24226 * 7 6 5 39 39 H 1.08999 * 109.49571 * 179.12383 * 7 6 5 40 40 H 1.09006 * 109.52178 * 62.24881 * 8 7 6 41 41 H 0.97001 * 120.00112 * 359.97438 * 10 9 8 42 42 H 1.08994 * 109.47084 * 300.00007 * 13 11 10 43 43 H 1.08997 * 109.46786 * 59.99824 * 13 11 10 44 44 H 0.97003 * 119.99803 * 180.02562 * 18 17 15 45 45 H 1.09000 * 117.49460 * 0.02562 * 23 9 8 46 46 H 1.08997 * 117.50266 * 145.02169 * 23 9 8 47 47 H 1.08996 * 117.49390 * 252.50803 * 24 23 9 48 48 H 1.08999 * 117.51714 * 107.48146 * 24 23 9 49 49 H 1.09000 * 109.50443 * 177.62794 * 25 8 7 50 50 H 1.09002 * 109.49744 * 297.74777 * 25 8 7 51 51 H 1.09004 * 109.45844 * 305.85979 * 26 5 4 52 52 H 1.09002 * 109.46428 * 65.82387 * 26 5 4 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 6 2.0400 1.4425 0.0000 4 6 2.0400 -0.7213 1.2492 5 7 1.5922 -2.1201 1.2241 6 6 2.1373 -2.8678 2.3645 7 6 1.5365 -4.2751 2.3875 8 6 1.8737 -4.9903 1.0763 9 6 1.2258 -6.3763 1.0686 10 7 -0.0711 -6.4713 1.7434 11 6 -0.7217 -7.6507 1.7899 12 8 -0.2338 -8.6333 1.2727 13 6 -2.0555 -7.7485 2.4845 14 16 -2.6691 -9.4479 2.3757 15 6 -4.1941 -9.2785 3.2418 16 1 -4.4821 -8.3192 3.6458 17 6 -5.0249 -10.3782 3.4059 18 7 -4.6737 -11.5476 2.9140 19 14 -6.6415 -10.1989 4.3248 20 1 -6.8019 -8.7926 4.7742 21 1 -7.7654 -10.5615 3.4246 22 1 -6.6423 -11.0996 5.5054 23 6 2.1537 -7.5904 1.1462 24 6 1.4451 -7.2518 -0.1669 25 6 1.3372 -4.1681 -0.0986 26 6 1.9439 -2.7625 -0.0488 27 1 -0.3633 0.5137 0.8900 28 1 -0.3633 0.5139 -0.8900 29 1 -0.3633 -1.0277 -0.0005 30 1 1.8934 -0.5138 -0.8900 31 1 3.1300 1.4425 0.0005 32 1 1.6766 1.9563 -0.8900 33 1 1.6767 1.9563 0.8900 34 1 1.6463 -0.2297 2.1388 35 1 3.1294 -0.6888 1.2682 36 1 1.8867 -2.3507 3.2908 37 1 3.2208 -2.9369 2.2690 38 1 0.4541 -4.2070 2.4969 39 1 1.9530 -4.8348 3.2250 40 1 2.9551 -5.0931 0.9852 41 1 -0.4615 -5.6854 2.1568 42 1 -1.9410 -7.4695 3.5319 43 1 -2.7653 -7.0748 2.0045 44 1 -5.2546 -12.3161 3.0284 45 1 3.2257 -7.4016 1.2032 46 1 1.7995 -8.4600 1.6996 47 1 0.6247 -7.8987 -0.4773 48 1 2.0507 -6.8402 -0.9743 49 1 1.6113 -4.6514 -1.0363 50 1 0.2517 -4.0983 -0.0282 51 1 1.5530 -2.1689 -0.8753 52 1 3.0284 -2.8322 -0.1331 RHF calculation, no. of doubly occupied orbitals= 63 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). S: (AM1): M.J.S. DEWAR, Y.-C. YUAN, INORGANIC CHEM., 29, 589 (1990) 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 ZINC001725792766.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 06:11:07 Heat of formation + Delta-G solvation = -19.822731 kcal Electronic energy + Delta-G solvation = -27860.584622 eV Core-core repulsion = 24179.515656 eV Total energy + Delta-G solvation = -3681.068966 eV No. of doubly occupied orbitals = 63 Molecular weight (most abundant/longest-lived isotopes) = 340.193 amu Computer time = 0.72 seconds Orbital eigenvalues (eV) -40.52139 -39.25052 -37.12419 -35.45387 -32.89773 -32.42060 -32.26628 -31.11126 -28.82868 -27.43824 -26.79759 -25.47603 -23.80486 -23.69886 -22.06209 -21.20147 -20.60580 -19.83551 -19.11242 -17.96839 -16.96167 -16.31829 -15.79629 -15.37771 -15.30769 -14.83162 -14.79649 -14.64038 -14.29723 -14.21320 -14.05840 -13.86372 -13.44419 -13.30229 -13.13481 -12.70834 -12.64377 -12.49963 -12.41945 -12.31368 -12.19389 -11.59149 -11.45070 -11.31447 -11.30116 -11.07796 -11.04515 -11.00302 -10.99692 -10.85251 -10.76527 -10.73862 -10.32931 -10.03193 -9.79202 -9.14982 -9.06448 -8.60603 -8.36378 -8.21939 -6.48398 -6.20984 -3.90989 3.02303 3.03812 3.22279 3.28771 3.33453 3.53845 3.70884 3.98450 4.21323 4.34004 4.35503 4.47291 4.56361 4.72154 4.77415 4.89087 4.92308 4.99782 5.06089 5.14339 5.16417 5.19115 5.24887 5.30449 5.31263 5.37405 5.39514 5.40013 5.46040 5.56478 5.57013 5.63774 5.67061 5.69417 5.74556 5.79337 5.84741 5.88602 5.91138 5.95942 5.97625 6.10215 6.15418 6.17037 6.28189 6.55951 6.77163 6.79449 6.84172 7.61030 7.77751 8.36481 8.65723 9.24669 10.86451 Molecular weight = 340.19amu Principal moments of inertia in cm(-1) A = 0.015171 B = 0.002238 C = 0.002036 Principal moments of inertia in units of 10**(-40)*gram-cm**2 A = 1845.169620 B =12508.631588 C =13745.837678 Net atomic charges, atomic populations, and dipole contributions calculated with CM2 Atom NO. Type Charge No. of electrons 1 C -0.140 4.140 2 C -0.100 4.100 3 C -0.147 4.147 4 C 0.061 3.939 5 N -0.534 5.534 6 C 0.058 3.942 7 C -0.112 4.112 8 C -0.048 4.048 9 C 0.107 3.893 10 N -0.702 5.702 11 C 0.532 3.468 12 O -0.512 6.512 13 C -0.154 4.154 14 S -0.058 6.058 15 C -0.534 4.534 16 H 0.073 0.927 17 C 0.073 3.927 18 N -0.868 5.868 19 Si 0.918 3.082 20 H -0.272 1.272 21 H -0.280 1.280 22 H -0.280 1.280 23 C -0.179 4.179 24 C -0.176 4.176 25 C -0.110 4.110 26 C 0.050 3.950 27 H 0.051 0.949 28 H 0.046 0.954 29 H 0.068 0.932 30 H 0.072 0.928 31 H 0.051 0.949 32 H 0.056 0.944 33 H 0.055 0.945 34 H 0.075 0.925 35 H 0.030 0.970 36 H 0.075 0.925 37 H 0.032 0.968 38 H 0.073 0.927 39 H 0.073 0.927 40 H 0.079 0.921 41 H 0.401 0.599 42 H 0.088 0.912 43 H 0.089 0.911 44 H 0.268 0.732 45 H 0.086 0.914 46 H 0.112 0.888 47 H 0.112 0.888 48 H 0.087 0.913 49 H 0.070 0.930 50 H 0.074 0.926 51 H 0.081 0.919 52 H 0.030 0.970 For the charges calculated by CM2: Dipole moment (debyes) X Y Z Total from point charges 16.558 24.506 -4.802 29.963 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 -0.197 4.197 2 C -0.119 4.119 3 C -0.205 4.205 4 C -0.067 4.067 5 N -0.259 5.259 6 C -0.070 4.070 7 C -0.150 4.150 8 C -0.067 4.067 9 C 0.019 3.981 10 N -0.356 5.356 11 C 0.319 3.681 12 O -0.387 6.387 13 C -0.304 4.304 14 S 0.168 5.832 15 C -0.683 4.683 16 H 0.091 0.909 17 C -0.136 4.136 18 N -0.503 5.503 19 Si 0.745 3.255 20 H -0.196 1.196 21 H -0.206 1.206 22 H -0.206 1.206 23 C -0.217 4.217 24 C -0.215 4.215 25 C -0.148 4.148 26 C -0.077 4.077 27 H 0.071 0.929 28 H 0.065 0.935 29 H 0.087 0.913 30 H 0.090 0.910 31 H 0.070 0.930 32 H 0.075 0.925 33 H 0.074 0.926 34 H 0.093 0.907 35 H 0.048 0.952 36 H 0.094 0.906 37 H 0.050 0.950 38 H 0.091 0.909 39 H 0.091 0.909 40 H 0.097 0.903 41 H 0.237 0.763 42 H 0.107 0.893 43 H 0.107 0.893 44 H 0.077 0.923 45 H 0.105 0.895 46 H 0.130 0.870 47 H 0.131 0.869 48 H 0.106 0.894 49 H 0.089 0.911 50 H 0.093 0.907 51 H 0.100 0.900 52 H 0.048 0.952 Dipole moment (debyes) X Y Z Total from point charges 16.792 22.683 -5.625 28.777 hybrid contribution -0.888 1.577 1.356 2.261 sum 15.903 24.260 -4.269 29.320 Atomic orbital electron populations 1.21740 0.94207 1.02775 1.00988 1.21254 0.97120 0.95679 0.97805 1.21820 1.00690 0.95980 1.02000 1.22172 0.97169 0.88542 0.98835 1.61958 1.59825 1.01591 1.02532 1.22065 0.96554 0.94420 0.93968 1.21613 1.01871 0.94286 0.97192 1.20835 0.99302 0.90822 0.95718 1.20546 0.86046 0.91860 0.99689 1.45445 1.19846 1.11929 1.58342 1.20303 0.86060 0.82342 0.79422 1.90653 1.67150 1.36203 1.44672 1.23543 0.96003 1.08275 1.02605 1.85364 1.22933 1.00780 1.74109 1.22912 1.05633 0.98608 1.41112 0.90901 1.24996 0.98537 0.94479 0.95630 1.70031 1.37239 0.99974 1.43070 0.86120 0.81864 0.78331 0.79199 1.19611 1.20574 1.20580 1.23464 0.96605 1.00088 1.01537 1.23383 1.03851 1.03025 0.91204 1.21675 1.01743 0.93504 0.97883 1.22241 0.97757 0.95448 0.92291 0.92938 0.93453 0.91340 0.91016 0.92961 0.92469 0.92593 0.90698 0.95217 0.90647 0.94972 0.90867 0.90883 0.90266 0.76279 0.89327 0.89305 0.92262 0.89517 0.86993 0.86949 0.89446 0.91133 0.90690 0.90044 0.95183 Number of geometries 1 Number of calculations of the screened coulomb radii 1 The total number of SCF iterations 13. 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 -0.14 -0.96 8.99 37.16 0.33 -0.63 16 2 C -0.10 -0.62 2.44 -90.62 -0.22 -0.84 16 3 C -0.15 -0.78 9.19 37.16 0.34 -0.43 16 4 C 0.06 0.40 4.54 -3.83 -0.02 0.39 16 5 N -0.53 -4.06 4.09 -234.57 -0.96 -5.02 16 6 C 0.06 0.43 5.46 -3.83 -0.02 0.41 16 7 C -0.11 -0.93 4.96 -26.65 -0.13 -1.06 16 8 C -0.05 -0.43 2.38 -90.50 -0.22 -0.64 16 9 C 0.11 1.30 2.49 -131.81 -0.33 0.97 16 10 N -0.70 -9.64 5.39 -47.60 -0.26 -9.90 16 11 C 0.53 9.81 7.55 -10.98 -0.08 9.73 16 12 O -0.51 -11.08 11.34 5.56 0.06 -11.02 16 13 C -0.15 -3.11 6.16 36.01 0.22 -2.88 16 14 S -0.06 -1.58 20.57 -107.50 -2.21 -3.79 16 15 C -0.53 -15.27 9.50 30.94 0.29 -14.98 16 16 H 0.07 1.98 7.80 -52.49 -0.41 1.57 16 17 C 0.07 2.08 5.49 -17.43 -0.10 1.99 16 18 N -0.87 -26.24 13.22 55.49 0.73 -25.51 16 19 Si 0.92 21.51 29.55 -169.99 -5.02 16.49 16 20 H -0.27 -6.17 7.11 56.52 0.40 -5.77 16 21 H -0.28 -6.45 7.11 56.52 0.40 -6.05 16 22 H -0.28 -6.45 7.11 56.52 0.40 -6.05 16 23 C -0.18 -2.43 9.36 -26.73 -0.25 -2.68 16 24 C -0.18 -2.38 8.96 -26.73 -0.24 -2.62 16 25 C -0.11 -0.94 5.20 -26.58 -0.14 -1.07 16 26 C 0.05 0.38 4.99 -3.76 -0.02 0.36 16 27 H 0.05 0.37 8.14 -51.93 -0.42 -0.06 16 28 H 0.05 0.30 8.14 -51.93 -0.42 -0.12 16 29 H 0.07 0.56 7.59 -51.93 -0.39 0.16 16 30 H 0.07 0.46 6.06 -51.93 -0.31 0.14 16 31 H 0.05 0.26 8.14 -51.93 -0.42 -0.16 16 32 H 0.06 0.29 8.14 -51.93 -0.42 -0.14 16 33 H 0.05 0.29 8.14 -51.93 -0.42 -0.14 16 34 H 0.07 0.50 8.14 -51.93 -0.42 0.08 16 35 H 0.03 0.20 8.14 -51.93 -0.42 -0.22 16 36 H 0.08 0.53 8.12 -51.93 -0.42 0.11 16 37 H 0.03 0.24 8.14 -51.93 -0.42 -0.18 16 38 H 0.07 0.64 6.30 -51.93 -0.33 0.32 16 39 H 0.07 0.62 8.14 -51.93 -0.42 0.19 16 40 H 0.08 0.68 7.90 -51.93 -0.41 0.27 16 41 H 0.40 4.59 6.57 -40.82 -0.27 4.32 16 42 H 0.09 1.67 8.14 -51.92 -0.42 1.24 16 43 H 0.09 1.68 8.14 -51.92 -0.42 1.26 16 44 H 0.27 7.50 8.31 -40.82 -0.34 7.16 16 45 H 0.09 0.97 8.05 -51.93 -0.42 0.55 16 46 H 0.11 1.90 6.38 -51.93 -0.33 1.57 16 47 H 0.11 1.90 6.37 -51.93 -0.33 1.57 16 48 H 0.09 0.97 7.64 -51.93 -0.40 0.57 16 49 H 0.07 0.59 7.39 -51.93 -0.38 0.20 16 50 H 0.07 0.73 8.14 -51.93 -0.42 0.31 16 51 H 0.08 0.58 5.72 -51.93 -0.30 0.28 16 52 H 0.03 0.22 8.14 -51.93 -0.42 -0.20 16 LS Contribution 409.21 15.07 6.17 6.17 Total: -1.00 -32.37 409.21 -11.39 -43.76 By element: Atomic # 1 Polarization: 12.15 SS G_CDS: -9.33 Total: 2.82 kcal Atomic # 6 Polarization: -13.43 SS G_CDS: -0.57 Total: -13.99 kcal Atomic # 7 Polarization: -39.95 SS G_CDS: -0.48 Total: -40.43 kcal Atomic # 8 Polarization: -11.08 SS G_CDS: 0.06 Total: -11.02 kcal Atomic # 14 Polarization: 21.51 SS G_CDS: -5.02 Total: 16.49 kcal Atomic # 16 Polarization: -1.58 SS G_CDS: -2.21 Total: -3.79 kcal Total LS contribution 6.17 Total: 6.17 kcal Total: -32.37 -11.39 -43.76 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. ZINC001725792766.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 23.938 kcal (2) G-P(sol) polarization free energy of solvation -32.369 kcal (3) G-ENP(sol) elect.-nuc.-pol. free energy of system -8.432 kcal (4) G-CDS(sol) cavity-dispersion-solvent structure free energy -11.391 kcal (5) G-P-CDS(sol) = G-P(sol) + G-CDS(sol) = (2) + (4) -43.760 kcal (6) G-S(sol) free energy of system = (1) + (5) -19.823 kcal 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED Total computer time = 0.72 seconds