Wall clock time and date at job start Sun Mar 7 2021 04:44:15 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= 0 * AM1 - THE AM1 HAMILTONIAN TO BE USED * SM5.42R - SM5.42R CALCULATIONS WILL BE PERFORMED * - CHARGE MODEL 2 WILL BE USED (CM2A) * - THE SOLVENT IS WATER ******************************************************************************* 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 O 2 2 C 1.42898 * 1 3 3 Si 1.86306 * 109.47276 * 2 1 4 4 H 1.48495 * 109.47292 * 179.97438 * 3 2 1 5 5 H 1.48501 * 109.46753 * 299.99853 * 3 2 1 6 6 H 1.48501 * 109.46821 * 59.99398 * 3 2 1 7 7 C 1.50701 * 109.46842 * 119.99319 * 2 1 3 8 8 C 1.38340 * 119.86689 * 65.00585 * 7 2 1 9 9 C 1.38000 * 120.12498 * 179.97438 * 8 7 2 10 10 C 1.39398 * 119.87474 * 359.97438 * 9 8 7 11 11 C 1.48278 * 120.12779 * 179.97438 * 10 9 8 12 12 C 1.39503 * 119.97367 * 180.02562 * 11 10 9 13 13 C 1.37668 * 120.02466 * 180.02562 * 12 11 10 14 14 C 1.39711 * 119.97409 * 359.97438 * 13 12 11 15 15 C 1.47719 * 120.02508 * 179.97438 * 14 13 12 16 16 O 1.21572 * 119.99944 * 307.64418 * 15 14 13 17 17 N 1.34773 * 119.99842 * 127.64027 * 15 14 13 18 18 C 1.46393 * 118.75450 * 355.30139 * 17 15 14 19 19 C 1.54455 * 108.76650 * 106.55719 * 18 17 15 20 20 Si 1.85202 * 107.12807 * 51.53863 * 19 18 17 21 21 C 1.87453 * 111.52762 * 191.59628 * 20 19 18 22 22 C 1.55684 * 100.85064 * 238.40533 * 21 20 19 23 23 C 1.53781 * 111.40125 * 27.99562 * 22 21 20 24 24 C 1.56391 * 109.77122 * 312.18146 * 23 22 21 25 25 C 1.85196 * 110.14482 * 315.99270 * 20 19 18 26 26 C 1.46400 * 118.75217 * 175.27903 * 17 15 14 27 27 C 1.39710 * 119.95084 * 0.25511 * 14 13 12 28 28 C 1.37666 * 119.97398 * 359.50793 * 27 14 13 29 29 C 1.39399 * 119.74476 * 0.25864 * 10 9 8 30 30 C 1.38001 * 119.87208 * 359.46625 * 29 10 9 31 31 H 0.96703 * 114.00458 * 300.00301 * 1 2 3 32 32 H 1.08994 * 109.47457 * 239.99944 * 2 1 3 33 33 H 1.07997 * 119.93755 * 359.97174 * 8 7 2 34 34 H 1.08006 * 120.05969 * 179.97438 * 9 8 7 35 35 H 1.08005 * 119.98877 * 359.97438 * 12 11 10 36 36 H 1.07994 * 120.01411 * 180.02562 * 13 12 11 37 37 H 1.09002 * 109.59033 * 346.77753 * 18 17 15 38 38 H 1.09000 * 109.58998 * 226.34543 * 18 17 15 39 39 H 1.08991 * 109.92748 * 292.13224 * 19 18 17 40 40 H 1.09006 * 109.92186 * 170.93942 * 19 18 17 41 41 H 1.09007 * 111.13894 * 356.30444 * 21 20 19 42 42 H 1.09000 * 111.14017 * 120.50544 * 21 20 19 43 43 H 1.08999 * 109.09709 * 267.48838 * 22 21 20 44 44 H 1.09000 * 109.10288 * 148.51769 * 22 21 20 45 45 H 1.09002 * 109.42415 * 192.08655 * 23 22 21 46 46 H 1.09009 * 109.41868 * 72.27182 * 23 22 21 47 47 H 1.09004 * 111.49330 * 281.93813 * 24 23 22 48 48 H 1.09000 * 111.49353 * 156.81811 * 24 23 22 49 49 H 1.08992 * 109.92477 * 163.40829 * 25 20 19 50 50 H 1.09008 * 109.92229 * 284.60417 * 25 20 19 51 51 H 1.09006 * 109.58543 * 133.65318 * 26 17 15 52 52 H 1.08999 * 109.58631 * 13.22846 * 26 17 15 53 53 H 1.08003 * 120.01383 * 179.74554 * 27 14 13 54 54 H 1.07999 * 119.98872 * 180.23290 * 28 27 14 55 55 H 1.07999 * 120.06566 * 179.74529 * 29 10 9 56 56 H 1.07997 * 119.94035 * 180.25311 * 30 29 10 Note: An asterisk (*) indicates this parameter was or will be optimized. Cartesian coordinates (angstroms) NO. Atom X Y Z 1 8 0.0000 0.0000 0.0000 2 6 1.4290 0.0000 0.0000 3 14 2.0500 1.7565 0.0000 4 1 3.5350 1.7565 0.0006 5 1 1.5550 2.4565 -1.2126 6 1 1.5549 2.4565 1.2125 7 6 1.9312 -0.7103 1.2306 8 6 1.6829 -2.0611 1.3959 9 6 2.1409 -2.7170 2.5204 10 6 2.8553 -2.0158 3.4905 11 6 3.3494 -2.7148 4.7013 12 6 4.0636 -2.0098 5.6703 13 6 4.5233 -2.6578 6.7946 14 6 4.2739 -4.0219 6.9651 15 6 4.7672 -4.7184 8.1707 16 8 5.9387 -4.6347 8.4846 17 7 3.9184 -5.4467 8.9228 18 6 2.4951 -5.4448 8.5804 19 6 2.1359 -6.8044 7.9415 20 14 2.7503 -8.1243 9.0863 21 6 2.6959 -9.8151 8.2789 22 6 1.7719 -10.5830 9.2689 23 6 0.7945 -9.6307 9.9778 24 6 1.5697 -8.3866 10.5230 25 6 4.4544 -7.7098 9.6814 26 6 4.4549 -6.2101 10.0509 27 6 3.5627 -4.7279 5.9916 28 6 3.0998 -4.0768 4.8705 29 6 3.0982 -0.6537 3.3209 30 6 2.6404 -0.0095 2.1896 31 1 -0.3934 0.4417 0.7650 32 1 1.7924 -0.5138 -0.8899 33 1 1.1297 -2.6035 0.6435 34 1 1.9460 -3.7716 2.6486 35 1 4.2566 -0.9554 5.5382 36 1 5.0758 -2.1118 7.5449 37 1 2.2909 -4.6426 7.8712 38 1 1.9023 -5.2971 9.4830 39 1 2.6224 -6.8988 6.9708 40 1 1.0551 -6.8865 7.8260 41 1 2.2501 -9.7622 7.2855 42 1 3.6884 -10.2638 8.2389 43 1 2.3877 -11.0833 10.0163 44 1 1.2036 -11.3325 8.7181 45 1 0.3173 -10.1525 10.8074 46 1 0.0323 -9.3018 9.2713 47 1 2.1058 -8.6216 11.4425 48 1 0.9079 -7.5310 10.6573 49 1 4.6972 -8.3087 10.5590 50 1 5.1801 -7.8975 8.8899 51 1 3.8307 -6.0502 10.9302 52 1 5.4743 -5.8856 10.2600 53 1 3.3729 -5.7833 6.1204 54 1 2.5467 -4.6215 4.1197 55 1 3.6476 -0.1045 4.0712 56 1 2.8315 1.0449 2.0551 RHF calculation, no. of doubly occupied orbitals= 71 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=0 AM1 1SCF TLIMIT=15 GEO-OK SM5.42R & SOLVNT=WATER s_22_15733048_13158362.mol2 56 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED SCF FIELD WAS ACHIEVED Wall clock time and date at job start Sun Mar 7 2021 04:44:15 Heat of formation + Delta-G solvation = -39.379949 kcal Electronic energy + Delta-G solvation = -33978.725026 eV Core-core repulsion = 29747.949910 eV Total energy + Delta-G solvation = -4230.775117 eV No. of doubly occupied orbitals = 71 Molecular weight (most abundant/longest-lived isotopes) = 395.183 amu Computer time = 1.72 seconds Orbital eigenvalues (eV) -41.71000 -40.77303 -39.31745 -37.50998 -37.41681 -36.13355 -34.19964 -32.82872 -32.34359 -31.60373 -30.99843 -30.10768 -29.66911 -26.99362 -25.11720 -24.72612 -24.58140 -24.13992 -23.29737 -22.60960 -21.85465 -21.02765 -20.39627 -18.94777 -18.43867 -17.97426 -17.36028 -17.03930 -16.67383 -16.19626 -16.08079 -16.01458 -15.80147 -15.58354 -15.57197 -15.18350 -15.06933 -14.90925 -14.71035 -14.52026 -14.42866 -14.25128 -14.14542 -14.03471 -13.87307 -13.69592 -13.47673 -13.31086 -13.11488 -12.79280 -12.61766 -12.56209 -12.50354 -12.26378 -12.18836 -12.10828 -12.01223 -11.95743 -11.81329 -11.48248 -11.34210 -11.11074 -10.72817 -10.43728 -10.40506 -10.33359 -10.23160 -10.03355 -9.94762 -9.74963 -9.04003 -0.59731 0.34369 0.40454 0.58796 1.18319 1.44456 1.51686 1.54642 1.77907 1.84533 1.88343 1.91474 1.99682 2.50684 2.65254 2.98047 3.33715 3.48850 3.59931 3.63836 3.78199 3.85464 3.99747 4.05196 4.09506 4.11923 4.15424 4.17309 4.24330 4.28555 4.30381 4.36582 4.38222 4.44950 4.58224 4.60412 4.65400 4.67075 4.69810 4.71575 4.74862 4.85444 4.90222 4.92775 5.00911 5.08439 5.12909 5.13779 5.15231 5.20824 5.22769 5.29212 5.31547 5.38465 5.39601 5.44206 5.51231 5.54608 5.56385 5.58965 5.67189 5.80839 5.94622 6.20306 6.70568 7.00121 Net atomic charges, atomic populations, and dipole contributions calculated with CM2 Atom NO. Type Charge No. of electrons 1 O -0.551 6.551 2 C -0.078 4.078 3 Si 0.978 3.022 4 H -0.260 1.260 5 H -0.277 1.277 6 H -0.251 1.251 7 C -0.119 4.119 8 C -0.096 4.096 9 C -0.108 4.108 10 C -0.057 4.057 11 C -0.029 4.029 12 C -0.117 4.117 13 C -0.081 4.081 14 C -0.140 4.140 15 C 0.552 3.448 16 O -0.582 6.582 17 N -0.601 5.601 18 C 0.103 3.897 19 C -0.434 4.434 20 Si 1.059 2.941 21 C -0.422 4.422 22 C -0.124 4.124 23 C -0.125 4.125 24 C -0.409 4.409 25 C -0.444 4.444 26 C 0.113 3.887 27 C -0.086 4.086 28 C -0.113 4.113 29 C -0.109 4.109 30 C -0.133 4.133 31 H 0.389 0.611 32 H 0.125 0.875 33 H 0.139 0.861 34 H 0.147 0.853 35 H 0.147 0.853 36 H 0.127 0.873 37 H 0.095 0.905 38 H 0.102 0.898 39 H 0.087 0.913 40 H 0.115 0.885 41 H 0.081 0.919 42 H 0.071 0.929 43 H 0.056 0.944 44 H 0.058 0.942 45 H 0.060 0.940 46 H 0.072 0.928 47 H 0.076 0.924 48 H 0.090 0.910 49 H 0.095 0.905 50 H 0.063 0.937 51 H 0.101 0.899 52 H 0.068 0.932 53 H 0.153 0.847 54 H 0.156 0.844 55 H 0.142 0.858 56 H 0.131 0.869 For the charges calculated by CM2: Dipole moment (debyes) X Y Z Total from point charges -5.991 -0.566 -0.178 6.021 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 O -0.358 6.358 2 C -0.188 4.188 3 Si 0.803 3.197 4 H -0.184 1.184 5 H -0.203 1.203 6 H -0.175 1.175 7 C -0.120 4.120 8 C -0.114 4.114 9 C -0.125 4.125 10 C -0.057 4.057 11 C -0.029 4.029 12 C -0.134 4.134 13 C -0.100 4.100 14 C -0.143 4.143 15 C 0.341 3.659 16 O -0.463 6.463 17 N -0.332 5.332 18 C -0.018 4.018 19 C -0.521 4.521 20 Si 1.249 2.751 21 C -0.507 4.507 22 C -0.162 4.162 23 C -0.162 4.162 24 C -0.495 4.495 25 C -0.528 4.528 26 C -0.009 4.009 27 C -0.104 4.104 28 C -0.131 4.131 29 C -0.127 4.127 30 C -0.151 4.151 31 H 0.238 0.762 32 H 0.142 0.858 33 H 0.156 0.844 34 H 0.165 0.835 35 H 0.164 0.836 36 H 0.145 0.855 37 H 0.113 0.887 38 H 0.120 0.880 39 H 0.106 0.894 40 H 0.134 0.866 41 H 0.100 0.900 42 H 0.090 0.910 43 H 0.075 0.925 44 H 0.076 0.924 45 H 0.078 0.922 46 H 0.091 0.909 47 H 0.095 0.905 48 H 0.108 0.892 49 H 0.113 0.887 50 H 0.082 0.918 51 H 0.119 0.881 52 H 0.087 0.913 53 H 0.170 0.830 54 H 0.173 0.827 55 H 0.160 0.840 56 H 0.148 0.852 Dipole moment (debyes) X Y Z Total from point charges -4.974 0.014 -0.521 5.002 hybrid contribution 0.334 -0.357 0.666 0.826 sum -4.640 -0.343 0.144 4.655 Atomic orbital electron populations 1.86493 1.17333 1.81901 1.50120 1.24981 0.84964 1.10444 0.98454 0.85276 0.79545 0.74989 0.79882 1.18427 1.20288 1.17484 1.20532 0.99239 0.95374 0.96839 1.21135 0.98691 0.93715 0.97871 1.21550 0.96802 1.01045 0.93150 1.18914 0.99102 0.93645 0.94064 1.19082 0.96730 0.93830 0.93276 1.21345 0.97966 1.01133 0.92982 1.21148 0.97735 0.93062 0.98060 1.19916 1.02929 0.95249 0.96203 1.18881 0.85260 0.78381 0.83336 1.90777 1.19067 1.64113 1.72354 1.48170 1.08930 1.46269 1.29880 1.21845 0.78464 0.99135 1.02361 1.26826 1.08463 1.07186 1.09632 0.78675 0.64171 0.65257 0.67001 1.26666 1.01572 1.18592 1.03827 1.21896 0.97595 0.98829 0.97870 1.22055 0.98427 0.95940 0.99826 1.26747 1.10621 1.00702 1.11466 1.26926 1.20526 0.98395 1.06942 1.21415 1.00693 0.90565 0.88186 1.21615 0.94880 1.01158 0.92748 1.21428 1.00162 0.93463 0.98002 1.21420 0.99468 0.93887 0.97921 1.21158 0.99180 1.00234 0.94535 0.76209 0.85753 0.84364 0.83497 0.83555 0.85545 0.88728 0.88031 0.89420 0.86611 0.89990 0.91048 0.92517 0.92361 0.92160 0.90887 0.90480 0.89169 0.88673 0.91838 0.88090 0.91334 0.82991 0.82689 0.84020 0.85173 Number of geometries 1 Number of calculations of the screened coulomb radii 1 The total number of SCF iterations 15. 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 O -0.55 0.57 12.83 -148.98 -1.91 -1.34 16 2 C -0.08 0.18 2.80 71.24 0.20 0.38 16 3 Si 0.98 -1.87 25.13 68.60 1.72 -0.15 16 4 H -0.26 0.10 7.11 99.48 0.71 0.80 16 5 H -0.28 -0.54 7.11 99.48 0.71 0.17 16 6 H -0.25 0.55 7.04 99.48 0.70 1.25 16 7 C -0.12 0.12 5.36 -19.82 -0.11 0.02 16 8 C -0.10 0.14 9.67 22.24 0.21 0.35 16 9 C -0.11 0.22 9.43 22.49 0.21 0.43 16 10 C -0.06 0.02 5.88 -20.05 -0.12 -0.09 16 11 C -0.03 0.01 5.88 -20.00 -0.12 -0.11 16 12 C -0.12 -0.05 9.41 22.44 0.21 0.16 16 13 C -0.08 -0.27 9.73 22.49 0.22 -0.05 16 14 C -0.14 -0.52 4.53 -20.06 -0.09 -0.61 16 15 C 0.55 4.19 7.12 86.75 0.62 4.81 16 16 O -0.58 -9.75 16.31 -3.94 -0.06 -9.82 16 17 N -0.60 -0.53 2.55 -820.15 -2.09 -2.62 16 18 C 0.10 -0.58 5.22 86.89 0.45 -0.13 16 19 C -0.43 3.68 4.97 72.48 0.36 4.04 16 20 Si 1.06 -7.33 10.74 68.60 0.74 -6.60 16 21 C -0.42 1.49 5.84 72.91 0.43 1.92 16 22 C -0.12 0.28 6.09 31.78 0.19 0.47 16 23 C -0.12 0.48 5.97 32.04 0.19 0.67 16 24 C -0.41 2.44 5.95 73.16 0.43 2.88 16 25 C -0.44 0.80 5.21 72.48 0.38 1.17 16 26 C 0.11 0.08 5.95 86.89 0.52 0.59 16 27 C -0.09 0.09 7.68 22.49 0.17 0.26 16 28 C -0.11 0.27 9.41 22.44 0.21 0.48 16 29 C -0.11 0.09 9.43 22.49 0.21 0.30 16 30 C -0.13 0.12 8.65 22.24 0.19 0.32 16 31 H 0.39 -2.82 8.70 -74.05 -0.64 -3.47 16 32 H 0.12 -0.48 7.96 -2.39 -0.02 -0.50 16 33 H 0.14 -0.46 8.06 -2.91 -0.02 -0.49 16 34 H 0.15 -0.95 6.19 -2.91 -0.02 -0.97 16 35 H 0.15 -0.50 6.19 -2.91 -0.02 -0.51 16 36 H 0.13 0.45 8.06 -2.91 -0.02 0.42 16 37 H 0.09 -0.50 5.38 -2.39 -0.01 -0.51 16 38 H 0.10 -0.95 8.08 -2.39 -0.02 -0.97 16 39 H 0.09 -0.75 5.28 -2.39 -0.01 -0.76 16 40 H 0.12 -1.37 7.97 -2.38 -0.02 -1.39 16 41 H 0.08 -0.36 8.03 -2.38 -0.02 -0.38 16 42 H 0.07 -0.15 8.03 -2.39 -0.02 -0.17 16 43 H 0.06 -0.08 8.14 -2.39 -0.02 -0.10 16 44 H 0.06 -0.09 8.14 -2.39 -0.02 -0.11 16 45 H 0.06 -0.16 8.14 -2.39 -0.02 -0.18 16 46 H 0.07 -0.41 8.14 -2.38 -0.02 -0.43 16 47 H 0.08 -0.39 8.04 -2.38 -0.02 -0.41 16 48 H 0.09 -0.71 8.04 -2.39 -0.02 -0.73 16 49 H 0.09 -0.30 7.97 -2.39 -0.02 -0.32 16 50 H 0.06 0.11 7.97 -2.38 -0.02 0.09 16 51 H 0.10 -0.44 8.08 -2.38 -0.02 -0.46 16 52 H 0.07 0.46 6.87 -2.39 -0.02 0.44 16 53 H 0.15 -0.72 4.84 -2.91 -0.01 -0.73 16 54 H 0.16 -1.15 6.19 -2.91 -0.02 -1.17 16 55 H 0.14 -0.60 6.19 -2.91 -0.02 -0.62 16 56 H 0.13 -0.42 4.84 -2.91 -0.01 -0.43 16 Total: 0.00 -19.27 428.52 4.39 -14.87 By element: Atomic # 1 Polarization: -13.62 SS G_CDS: 1.01 Total: -12.61 kcal Atomic # 6 Polarization: 13.29 SS G_CDS: 4.98 Total: 18.27 kcal Atomic # 7 Polarization: -0.53 SS G_CDS: -2.09 Total: -2.62 kcal Atomic # 8 Polarization: -9.19 SS G_CDS: -1.98 Total: -11.16 kcal Atomic # 14 Polarization: -9.21 SS G_CDS: 2.46 Total: -6.75 kcal Total: -19.27 4.39 -14.87 kcal The number of atoms in the molecule is 56 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. s_22_15733048_13158362.mol2 56 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 -24.506 kcal (2) G-P(sol) polarization free energy of solvation -19.265 kcal (3) G-ENP(sol) elect.-nuc.-pol. free energy of system -43.771 kcal (4) G-CDS(sol) cavity-dispersion-solvent structure free energy 4.391 kcal (5) G-P-CDS(sol) = G-P(sol) + G-CDS(sol) = (2) + (4) -14.874 kcal (6) G-S(sol) free energy of system = (1) + (5) -39.380 kcal 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED Total computer time = 1.72 seconds