Wall clock time and date at job start Sat Apr 11 2020 06:09:07 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 N 2 2 C 1.31635 * 1 3 3 Si 1.86800 * 119.99849 * 2 1 4 4 H 1.48495 * 109.47118 * 239.99479 * 3 2 1 5 5 H 1.48499 * 109.47291 * 359.97438 * 3 2 1 6 6 H 1.48499 * 109.47360 * 119.99606 * 3 2 1 7 7 C 1.38791 * 120.00135 * 179.97438 * 2 1 3 8 8 H 1.08003 * 120.00110 * 180.02562 * 7 2 1 9 9 S 1.76205 * 120.00110 * 0.02562 * 7 2 1 10 10 C 1.80996 * 100.00083 * 179.97438 * 9 7 2 11 11 C 1.50702 * 109.47066 * 180.02562 * 10 9 7 12 12 O 1.21281 * 120.00115 * 359.97438 * 11 10 9 13 13 N 1.34781 * 119.99897 * 180.02562 * 11 10 9 14 14 C 1.47422 * 125.64974 * 4.88551 * 13 11 10 15 15 C 1.54910 * 104.83220 * 204.17484 * 14 13 11 16 16 C 1.55154 * 101.57883 * 322.98985 * 15 14 13 17 17 C 1.47026 * 125.64705 * 184.93504 * 13 11 10 18 18 H 1.08998 * 110.00846 * 59.40630 * 17 13 11 19 19 C 1.53000 * 109.88235 * 298.31521 * 17 13 11 20 20 N 1.46895 * 109.46944 * 177.05224 * 19 17 13 21 21 C 1.46906 * 110.99916 * 184.90017 * 20 19 17 22 22 C 1.53001 * 109.46992 * 180.02562 * 21 20 19 23 23 C 1.53004 * 109.47024 * 179.97438 * 22 21 20 24 24 C 1.54265 * 110.03149 * 292.91006 * 23 22 21 25 25 C 1.54969 * 104.15699 * 217.13518 * 24 23 22 26 26 C 1.54880 * 102.77699 * 37.88755 * 25 24 23 27 27 C 1.53870 * 110.03011 * 175.69012 * 23 22 21 28 28 H 0.97000 * 119.99955 * 0.02562 * 1 2 3 29 29 H 1.08998 * 109.47361 * 60.00394 * 10 9 7 30 30 H 1.09005 * 109.47633 * 300.00268 * 10 9 7 31 31 H 1.08992 * 110.37097 * 85.33331 * 14 13 11 32 32 H 1.09005 * 110.36464 * 323.01048 * 14 13 11 33 33 H 1.08997 * 111.00746 * 204.91109 * 15 14 13 34 34 H 1.09009 * 111.00609 * 81.06063 * 15 14 13 35 35 H 1.09004 * 110.72093 * 153.86940 * 16 15 14 36 36 H 1.09004 * 110.71959 * 277.13427 * 16 15 14 37 37 H 1.09006 * 109.47104 * 297.05110 * 19 17 13 38 38 H 1.08995 * 109.47132 * 57.05008 * 19 17 13 39 39 H 1.00894 * 111.00162 * 308.85544 * 20 19 17 40 40 H 1.08998 * 109.47024 * 299.99891 * 21 20 19 41 41 H 1.08997 * 109.47161 * 59.99832 * 21 20 19 42 42 H 1.09000 * 109.47428 * 300.00262 * 22 21 20 43 43 H 1.09002 * 109.47144 * 60.00351 * 22 21 20 44 44 H 1.09002 * 110.01070 * 54.29912 * 23 22 21 45 45 H 1.08996 * 110.49054 * 335.77780 * 24 23 22 46 46 H 1.09003 * 110.48375 * 98.43066 * 24 23 22 47 47 H 1.09006 * 110.71808 * 279.57334 * 25 24 23 48 48 H 1.09001 * 110.92307 * 156.29851 * 25 24 23 49 49 H 1.09000 * 110.48942 * 203.40623 * 26 25 24 50 50 H 1.08995 * 110.49043 * 80.76334 * 26 25 24 51 51 H 1.09009 * 110.03031 * 238.56971 * 27 23 22 52 52 H 1.09001 * 110.03857 * 0.02562 * 27 23 22 Note: An asterisk (*) indicates this parameter was or will be optimized. Cartesian coordinates (angstroms) NO. Atom X Y Z 1 7 0.0000 0.0000 0.0000 2 6 1.3164 0.0000 0.0000 3 14 2.2503 1.6178 0.0000 4 1 3.1041 1.6964 -1.2124 5 1 1.2853 2.7465 -0.0006 6 1 3.1040 1.6965 1.2125 7 6 2.0103 -1.2019 0.0005 8 1 3.0904 -1.2019 0.0010 9 16 1.1294 -2.7280 0.0005 10 6 2.5159 -3.8913 0.0005 11 6 1.9875 -5.3027 -0.0001 12 8 0.7912 -5.5023 0.0000 13 7 2.8443 -6.3431 0.0003 14 6 4.3118 -6.2476 0.1034 15 6 4.8407 -7.5498 -0.5479 16 6 3.7770 -8.5819 -0.0887 17 6 2.4702 -7.7612 -0.1030 18 1 1.9316 -7.9380 -1.0340 19 6 1.5944 -8.1564 1.0877 20 7 1.1681 -9.5543 0.9392 21 6 0.2306 -9.9347 2.0044 22 6 -0.1894 -11.3939 1.8169 23 6 -1.1653 -11.7902 2.9267 24 6 -0.4409 -11.8007 4.2886 25 6 -1.0652 -13.0032 5.0408 26 6 -1.2494 -14.0523 3.9164 27 6 -1.6796 -13.2210 2.6900 28 1 -0.4850 0.8400 -0.0004 29 1 3.1245 -3.7313 0.8905 30 1 3.1246 -3.7313 -0.8894 31 1 4.6161 -6.1955 1.1487 32 1 4.6745 -5.3763 -0.4420 33 1 5.8270 -7.8071 -0.1618 34 1 4.8583 -7.4641 -1.6344 35 1 3.7180 -9.4133 -0.7911 36 1 3.9964 -8.9403 0.9170 37 1 2.1644 -8.0464 2.0103 38 1 0.7170 -7.5108 1.1235 39 1 0.7648 -9.7145 0.0284 40 1 0.7153 -9.8182 2.9737 41 1 -0.6500 -9.2940 1.9592 42 1 -0.6740 -11.5109 0.8476 43 1 0.6914 -12.0343 1.8625 44 1 -2.0022 -11.0924 2.9542 45 1 0.6297 -11.9518 4.1501 46 1 -0.6296 -10.8726 4.8282 47 1 -2.0268 -12.7293 5.4750 48 1 -0.3880 -13.3756 5.8094 49 1 -2.0276 -14.7667 4.1849 50 1 -0.3097 -14.5674 3.7174 51 1 -2.7662 -13.2177 2.6037 52 1 -1.2336 -13.6333 1.7849 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 ZINC001483921760.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 06:09:07 Heat of formation + Delta-G solvation = -63.049821 kcal Electronic energy + Delta-G solvation = -26922.527944 eV Core-core repulsion = 23239.584511 eV Total energy + Delta-G solvation = -3682.943433 eV No. of doubly occupied orbitals = 63 Molecular weight (most abundant/longest-lived isotopes) = 340.193 amu Computer time = 0.75 seconds Orbital eigenvalues (eV) -40.01325 -38.88737 -37.33162 -36.01917 -32.50002 -32.43316 -31.61811 -29.90058 -29.01682 -28.49899 -26.57911 -25.49728 -24.29506 -22.49136 -22.27454 -21.06798 -20.87532 -19.81807 -18.96848 -17.67269 -16.83979 -16.51165 -16.09075 -15.63408 -15.33042 -15.05334 -14.80865 -14.56530 -14.45835 -14.10415 -13.96331 -13.77009 -13.61677 -13.25180 -13.07911 -12.82744 -12.55376 -12.42035 -12.18291 -12.00877 -11.77598 -11.56630 -11.42539 -11.33090 -11.30387 -11.05617 -11.04383 -11.04025 -10.97251 -10.85007 -10.81826 -10.76592 -10.63428 -10.57406 -9.82541 -9.40315 -9.06263 -8.55094 -8.44976 -8.24063 -6.50650 -6.21829 -3.92634 2.88802 3.05415 3.23146 3.25150 3.28720 3.58339 4.06618 4.20042 4.29071 4.33024 4.46011 4.48266 4.54348 4.77028 4.90138 4.96066 5.05173 5.11983 5.13153 5.13489 5.14783 5.26228 5.29507 5.32272 5.35023 5.39423 5.46199 5.53426 5.54447 5.60008 5.62621 5.65914 5.68320 5.69837 5.79458 5.82207 5.83769 5.85815 5.89379 5.96113 5.99587 6.00484 6.04763 6.14089 6.18850 6.20487 6.49519 6.88338 7.23936 7.58834 7.70508 8.34704 8.56639 9.23241 10.85544 Molecular weight = 340.19amu Principal moments of inertia in cm(-1) A = 0.014913 B = 0.001939 C = 0.001775 Principal moments of inertia in units of 10**(-40)*gram-cm**2 A = 1877.102377 B =14435.395756 C =15772.882929 Net atomic charges, atomic populations, and dipole contributions calculated with CM2 Atom NO. Type Charge No. of electrons 1 N -0.868 5.868 2 C 0.074 3.926 3 Si 0.919 3.081 4 H -0.274 1.274 5 H -0.283 1.283 6 H -0.274 1.274 7 C -0.535 4.535 8 H 0.072 0.928 9 S -0.061 6.061 10 C -0.147 4.147 11 C 0.549 3.451 12 O -0.516 6.516 13 N -0.622 5.622 14 C 0.101 3.899 15 C -0.137 4.137 16 C -0.112 4.112 17 C 0.142 3.858 18 H 0.070 0.930 19 C 0.046 3.954 20 N -0.686 5.686 21 C 0.058 3.942 22 C -0.107 4.107 23 C -0.093 4.093 24 C -0.121 4.121 25 C -0.127 4.127 26 C -0.125 4.125 27 C -0.121 4.121 28 H 0.269 0.731 29 H 0.088 0.912 30 H 0.089 0.911 31 H 0.067 0.933 32 H 0.078 0.922 33 H 0.082 0.918 34 H 0.074 0.926 35 H 0.079 0.921 36 H 0.079 0.921 37 H 0.070 0.930 38 H 0.053 0.947 39 H 0.338 0.662 40 H 0.071 0.929 41 H 0.030 0.970 42 H 0.059 0.941 43 H 0.070 0.930 44 H 0.070 0.930 45 H 0.068 0.932 46 H 0.064 0.936 47 H 0.064 0.936 48 H 0.063 0.937 49 H 0.061 0.939 50 H 0.064 0.936 51 H 0.061 0.939 52 H 0.064 0.936 For the charges calculated by CM2: Dipole moment (debyes) X Y Z Total from point charges 5.524 -26.947 4.543 27.880 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 N -0.503 5.503 2 C -0.136 4.136 3 Si 0.745 3.255 4 H -0.199 1.199 5 H -0.208 1.208 6 H -0.199 1.199 7 C -0.684 4.684 8 H 0.090 0.910 9 S 0.166 5.834 10 C -0.298 4.298 11 C 0.337 3.663 12 O -0.390 6.390 13 N -0.360 5.360 14 C -0.023 4.023 15 C -0.175 4.175 16 C -0.150 4.150 17 C 0.037 3.963 18 H 0.088 0.912 19 C -0.084 4.084 20 N -0.317 5.317 21 C -0.071 4.071 22 C -0.145 4.145 23 C -0.112 4.112 24 C -0.158 4.158 25 C -0.164 4.164 26 C -0.162 4.162 27 C -0.158 4.158 28 H 0.079 0.921 29 H 0.106 0.894 30 H 0.107 0.893 31 H 0.085 0.915 32 H 0.097 0.903 33 H 0.100 0.900 34 H 0.093 0.907 35 H 0.098 0.902 36 H 0.098 0.902 37 H 0.089 0.911 38 H 0.071 0.929 39 H 0.155 0.845 40 H 0.090 0.910 41 H 0.049 0.951 42 H 0.078 0.922 43 H 0.089 0.911 44 H 0.089 0.911 45 H 0.087 0.913 46 H 0.082 0.918 47 H 0.083 0.917 48 H 0.082 0.918 49 H 0.080 0.920 50 H 0.083 0.917 51 H 0.080 0.920 52 H 0.083 0.917 Dipole moment (debyes) X Y Z Total from point charges 4.061 -27.285 4.868 28.012 hybrid contribution 1.187 1.858 -0.272 2.222 sum 5.248 -25.427 4.597 26.366 Atomic orbital electron populations 1.70011 1.05949 1.27559 1.46789 1.24990 0.95032 0.99013 0.94526 0.86223 0.79239 0.81228 0.78806 1.19929 1.20799 1.19933 1.22819 0.94864 0.91625 1.59057 0.90986 1.85377 1.04995 0.96329 1.96717 1.23517 1.06443 0.95047 1.04756 1.20038 0.85708 0.85472 0.75039 1.90684 1.15006 1.85128 1.48164 1.48566 1.07023 1.05314 1.75068 1.22298 0.80253 0.98963 1.00763 1.22825 0.98934 0.94613 1.01102 1.22566 0.92689 0.97090 1.02700 1.21434 0.96123 0.80838 0.97875 0.91175 1.22345 0.99423 0.88323 0.98336 1.60507 1.43359 1.21572 1.06246 1.21989 0.94078 0.95454 0.95603 1.21672 0.98895 0.95912 0.98047 1.21768 0.97872 0.96711 0.94825 1.22482 0.99900 0.98178 0.95247 1.22519 1.00714 0.95786 0.97430 1.22352 1.01069 0.97592 0.95234 1.22211 1.00561 0.94776 0.98291 0.92133 0.89371 0.89301 0.91458 0.90345 0.89987 0.90692 0.90198 0.90227 0.91123 0.92876 0.84492 0.91049 0.95147 0.92185 0.91083 0.91124 0.91301 0.91757 0.91683 0.91776 0.91985 0.91739 0.92007 0.91679 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 N -0.87 -26.29 13.22 55.49 0.73 -25.56 16 2 C 0.07 2.11 5.49 -17.43 -0.10 2.02 16 3 Si 0.92 21.47 29.55 -169.99 -5.02 16.45 16 4 H -0.27 -6.24 7.11 56.52 0.40 -5.84 16 5 H -0.28 -6.49 7.11 56.52 0.40 -6.09 16 6 H -0.27 -6.24 7.11 56.52 0.40 -5.84 16 7 C -0.54 -15.35 9.50 30.94 0.29 -15.05 16 8 H 0.07 1.95 7.80 -52.48 -0.41 1.54 16 9 S -0.06 -1.67 20.57 -107.50 -2.21 -3.88 16 10 C -0.15 -3.06 5.09 36.01 0.18 -2.88 16 11 C 0.55 10.69 7.69 -10.98 -0.08 10.61 16 12 O -0.52 -11.87 14.68 5.56 0.08 -11.79 16 13 N -0.62 -9.13 3.06 -163.02 -0.50 -9.63 16 14 C 0.10 1.11 6.74 -2.53 -0.02 1.09 16 15 C -0.14 -1.15 7.09 -24.58 -0.17 -1.32 16 16 C -0.11 -1.02 6.24 -24.90 -0.16 -1.17 16 17 C 0.14 1.75 3.04 -66.95 -0.20 1.55 16 18 H 0.07 0.93 8.14 -51.93 -0.42 0.50 16 19 C 0.05 0.59 5.08 -3.83 -0.02 0.57 16 20 N -0.69 -7.14 6.28 -113.78 -0.71 -7.86 16 21 C 0.06 0.57 5.53 -3.82 -0.02 0.55 16 22 C -0.11 -0.86 4.60 -26.73 -0.12 -0.98 16 23 C -0.09 -0.70 2.93 -89.50 -0.26 -0.97 16 24 C -0.12 -0.89 5.50 -25.03 -0.14 -1.03 16 25 C -0.13 -0.85 6.91 -24.70 -0.17 -1.02 16 26 C -0.12 -0.80 6.83 -25.08 -0.17 -0.97 16 27 C -0.12 -0.83 6.46 -25.61 -0.17 -0.99 16 28 H 0.27 7.58 8.31 -40.82 -0.34 7.24 16 29 H 0.09 1.71 8.14 -51.92 -0.42 1.29 16 30 H 0.09 1.72 7.95 -51.91 -0.41 1.31 16 31 H 0.07 0.69 8.14 -51.93 -0.42 0.27 16 32 H 0.08 0.85 7.47 -51.93 -0.39 0.46 16 33 H 0.08 0.54 8.14 -51.93 -0.42 0.11 16 34 H 0.07 0.63 8.14 -51.92 -0.42 0.20 16 35 H 0.08 0.64 8.14 -51.93 -0.42 0.22 16 36 H 0.08 0.72 7.80 -51.93 -0.41 0.31 16 37 H 0.07 0.92 8.07 -51.93 -0.42 0.50 16 38 H 0.05 0.88 6.60 -51.93 -0.34 0.53 16 39 H 0.34 3.35 8.66 -39.30 -0.34 3.01 16 40 H 0.07 0.72 7.48 -51.93 -0.39 0.33 16 41 H 0.03 0.34 8.14 -51.93 -0.42 -0.08 16 42 H 0.06 0.47 8.14 -51.93 -0.42 0.05 16 43 H 0.07 0.58 8.02 -51.93 -0.42 0.16 16 44 H 0.07 0.58 8.14 -51.93 -0.42 0.16 16 45 H 0.07 0.52 7.77 -51.93 -0.40 0.12 16 46 H 0.06 0.49 8.14 -51.93 -0.42 0.07 16 47 H 0.06 0.43 8.14 -51.93 -0.42 0.01 16 48 H 0.06 0.39 8.14 -51.93 -0.42 -0.03 16 49 H 0.06 0.36 8.14 -51.93 -0.42 -0.06 16 50 H 0.06 0.40 8.14 -51.93 -0.42 -0.02 16 51 H 0.06 0.41 8.14 -51.92 -0.42 -0.01 16 52 H 0.06 0.43 7.67 -51.93 -0.40 0.03 16 LS Contribution 419.15 15.07 6.32 6.32 Total: -1.00 -33.04 419.15 -12.44 -45.49 By element: Atomic # 1 Polarization: 10.27 SS G_CDS: -9.80 Total: 0.47 kcal Atomic # 6 Polarization: -8.67 SS G_CDS: -1.32 Total: -10.00 kcal Atomic # 7 Polarization: -42.57 SS G_CDS: -0.48 Total: -43.05 kcal Atomic # 8 Polarization: -11.87 SS G_CDS: 0.08 Total: -11.79 kcal Atomic # 14 Polarization: 21.47 SS G_CDS: -5.02 Total: 16.45 kcal Atomic # 16 Polarization: -1.67 SS G_CDS: -2.21 Total: -3.88 kcal Total LS contribution 6.32 Total: 6.32 kcal Total: -33.04 -12.44 -45.49 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. ZINC001483921760.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 -17.563 kcal (2) G-P(sol) polarization free energy of solvation -33.043 kcal (3) G-ENP(sol) elect.-nuc.-pol. free energy of system -50.606 kcal (4) G-CDS(sol) cavity-dispersion-solvent structure free energy -12.444 kcal (5) G-P-CDS(sol) = G-P(sol) + G-CDS(sol) = (2) + (4) -45.487 kcal (6) G-S(sol) free energy of system = (1) + (5) -63.050 kcal 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED Total computer time = 0.75 seconds