Wall clock time and date at job start Sat Apr 11 2020 06:11:43 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 1.53008 * 1 3 3 C 1.52994 * 109.47297 * 2 1 4 4 N 1.46897 * 109.47479 * 179.97438 * 3 2 1 5 5 C 1.46901 * 110.99609 * 66.04608 * 4 3 2 6 6 C 1.46901 * 111.00402 * 190.00267 * 4 3 2 7 7 C 1.50702 * 109.47010 * 170.00489 * 6 4 3 8 8 O 1.21283 * 120.00234 * 359.97438 * 7 6 4 9 9 N 1.34772 * 119.99767 * 180.02562 * 7 6 4 10 10 C 1.46504 * 120.00218 * 179.97438 * 9 7 6 11 11 C 1.53000 * 109.47281 * 180.02562 * 10 9 7 12 12 H 1.08996 * 110.63198 * 51.89671 * 11 10 9 13 13 C 1.55140 * 110.70231 * 288.59628 * 11 10 9 14 14 C 1.54908 * 101.65271 * 205.96427 * 13 11 10 15 15 N 1.47844 * 104.79422 * 37.07172 * 14 13 11 16 16 C 1.46896 * 111.00138 * 213.63597 * 15 14 13 17 17 C 1.50700 * 109.46942 * 290.84301 * 16 15 14 18 18 O 1.21293 * 120.00282 * 359.97438 * 17 16 15 19 19 N 1.34777 * 120.00075 * 179.97438 * 17 16 15 20 20 C 1.37104 * 120.00173 * 180.02562 * 19 17 16 21 21 H 1.08002 * 119.99666 * 359.97438 * 20 19 17 22 22 C 1.38945 * 120.00001 * 180.27893 * 20 19 17 23 23 N 1.31414 * 119.99893 * 359.72318 * 22 20 19 24 24 Si 1.86801 * 119.99957 * 179.72309 * 22 20 19 25 25 H 1.48494 * 109.47230 * 359.97438 * 24 22 20 26 26 H 1.48502 * 109.46780 * 119.99924 * 24 22 20 27 27 H 1.48495 * 109.46909 * 239.99525 * 24 22 20 28 28 C 1.47437 * 108.56814 * 335.90519 * 15 14 13 29 29 H 1.08999 * 109.46818 * 300.00334 * 1 2 3 30 30 H 1.09000 * 109.46728 * 59.99533 * 1 2 3 31 31 H 1.08996 * 109.46923 * 179.97438 * 1 2 3 32 32 H 1.08997 * 109.47211 * 240.00024 * 2 1 3 33 33 H 1.08999 * 109.47112 * 120.00091 * 2 1 3 34 34 H 1.09005 * 109.46804 * 60.00144 * 3 2 1 35 35 H 1.09000 * 109.47613 * 299.99926 * 3 2 1 36 36 H 1.09001 * 109.47239 * 183.95245 * 5 4 3 37 37 H 1.09002 * 109.47395 * 303.95305 * 5 4 3 38 38 H 1.08995 * 109.47226 * 63.96123 * 5 4 3 39 39 H 1.08995 * 109.47243 * 50.00101 * 6 4 3 40 40 H 1.08997 * 109.46646 * 290.00024 * 6 4 3 41 41 H 0.97003 * 120.00122 * 359.97438 * 9 7 6 42 42 H 1.08995 * 109.46929 * 59.99801 * 10 9 7 43 43 H 1.09000 * 109.46697 * 299.99977 * 10 9 7 44 44 H 1.09002 * 110.99406 * 324.05859 * 13 11 10 45 45 H 1.08998 * 110.99163 * 87.83724 * 13 11 10 46 46 H 1.09000 * 110.37552 * 278.24461 * 14 13 11 47 47 H 1.08998 * 110.37022 * 155.90018 * 14 13 11 48 48 H 1.08994 * 109.47346 * 170.84607 * 16 15 14 49 49 H 1.08998 * 109.47279 * 50.84279 * 16 15 14 50 50 H 0.97000 * 120.00140 * 0.02562 * 19 17 16 51 51 H 0.97004 * 119.99542 * 180.02562 * 23 22 20 52 52 H 1.09007 * 109.89457 * 120.39461 * 28 15 14 53 53 H 1.08998 * 109.89196 * 241.41945 * 28 15 14 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 1.5301 0.0000 0.0000 3 6 2.0401 1.4424 0.0000 4 7 3.5091 1.4425 0.0006 5 6 4.0360 0.8855 -1.2524 6 6 4.0355 2.7931 0.2388 7 6 5.5217 2.7182 0.4767 8 8 6.0868 1.6454 0.4508 9 7 6.2228 3.8434 0.7192 10 6 7.6676 3.7707 0.9509 11 6 8.2156 5.1772 1.2002 12 1 7.6438 5.6795 1.9804 13 6 8.2106 6.0079 -0.1100 14 6 9.3468 7.0256 0.1603 15 7 10.3703 6.2600 0.9033 16 6 11.0618 7.1140 1.8782 17 6 11.9191 8.1163 1.1490 18 8 11.9512 8.1186 -0.0635 19 7 12.6501 9.0101 1.8441 20 6 13.4296 9.9223 1.1808 21 1 13.4581 9.9242 0.1011 22 6 14.1876 10.8399 1.8975 23 7 14.1533 10.8371 3.2112 24 14 15.2557 12.0777 0.9938 25 1 15.1193 11.8732 -0.4707 26 1 14.8226 13.4542 1.3443 27 1 16.6745 11.8893 1.3895 28 6 9.7126 5.1218 1.5708 29 1 -0.3633 0.5139 0.8900 30 1 -0.3633 0.5139 -0.8900 31 1 -0.3633 -1.0276 -0.0005 32 1 1.8934 -0.5138 -0.8900 33 1 1.8934 -0.5138 0.8900 34 1 1.6768 1.9562 0.8901 35 1 1.6768 1.9563 -0.8900 36 1 5.1233 0.8322 -1.1975 37 1 3.6304 -0.1148 -1.4043 38 1 3.7453 1.5258 -2.0852 39 1 3.5487 3.2237 1.1139 40 1 3.8379 3.4187 -0.6316 41 1 5.7709 4.7014 0.7402 42 1 8.1547 3.3403 0.0760 43 1 7.8648 3.1448 1.8213 44 1 8.4443 5.3812 -0.9707 45 1 7.2557 6.5153 -0.2470 46 1 8.9784 7.8536 0.7659 47 1 9.7570 7.3947 -0.7796 48 1 11.6905 6.4971 2.5202 49 1 10.3262 7.6398 2.4869 50 1 12.6247 9.0081 2.8138 51 1 14.6822 11.4780 3.7116 52 1 10.1468 4.1852 1.2209 53 1 9.8329 5.2053 2.6509 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 ZINC001714645829.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 06:11:43 Heat of formation + Delta-G solvation = -64.888766 kcal Electronic energy + Delta-G solvation = -28967.728493 eV Core-core repulsion = 24874.245197 eV Total energy + Delta-G solvation = -4093.483296 eV No. of doubly occupied orbitals = 66 Molecular weight (most abundant/longest-lived isotopes) = 340.226 amu Computer time = 0.74 seconds Orbital eigenvalues (eV) -40.26288 -39.28032 -37.90986 -37.46869 -35.12083 -33.87225 -33.60666 -32.08532 -31.17075 -29.71954 -28.64562 -27.42064 -27.01543 -25.10023 -24.04054 -23.27099 -21.26274 -21.12338 -20.82183 -20.13602 -19.19468 -17.87039 -17.40529 -16.82219 -16.36887 -16.08465 -15.85334 -15.48882 -15.25956 -14.91444 -14.69801 -14.46971 -14.40206 -14.12315 -13.86336 -13.71496 -13.52630 -13.20567 -13.12137 -12.76237 -12.60308 -12.42621 -12.25166 -12.14025 -12.05444 -11.76109 -11.71899 -11.51813 -11.48201 -11.26066 -11.16879 -11.00804 -10.98513 -10.87900 -10.64716 -10.33583 -10.21359 -9.99098 -9.49264 -9.29960 -8.73691 -8.43355 -7.95769 -7.86325 -6.40544 -3.81143 2.40113 2.72735 3.16846 3.27292 3.34546 3.57945 3.92831 4.03827 4.26092 4.35829 4.43315 4.47377 4.55596 4.57501 4.75479 4.78521 4.82687 4.92683 5.02235 5.05573 5.12503 5.17584 5.19558 5.24726 5.30613 5.32740 5.34713 5.41309 5.49195 5.58158 5.63385 5.69453 5.73766 5.76632 5.78477 5.82550 5.88832 5.92060 6.03244 6.13636 6.26223 6.30626 6.45775 6.48906 6.62252 7.22544 7.26561 7.28484 7.56523 8.00285 8.08149 8.63763 9.19986 9.56469 10.08619 10.77441 Molecular weight = 340.23amu Principal moments of inertia in cm(-1) A = 0.045733 B = 0.001391 C = 0.001387 Principal moments of inertia in units of 10**(-40)*gram-cm**2 A = 612.103290 B =20123.451980 C =20181.201251 Net atomic charges, atomic populations, and dipole contributions calculated with CM2 Atom NO. Type Charge No. of electrons 1 C -0.151 4.151 2 C -0.122 4.122 3 C 0.054 3.946 4 N -0.526 5.526 5 C 0.015 3.985 6 C 0.035 3.965 7 C 0.512 3.488 8 O -0.522 6.522 9 N -0.731 5.731 10 C 0.134 3.866 11 C -0.123 4.123 12 H 0.081 0.919 13 C -0.125 4.125 14 C 0.053 3.947 15 N -0.505 5.505 16 C 0.041 3.959 17 C 0.445 3.555 18 O -0.577 6.577 19 N -0.567 5.567 20 C -0.297 4.297 21 H 0.103 0.897 22 C 0.022 3.978 23 N -0.903 5.903 24 Si 0.928 3.072 25 H -0.268 1.268 26 H -0.282 1.282 27 H -0.282 1.282 28 C 0.050 3.950 29 H 0.055 0.945 30 H 0.052 0.948 31 H 0.057 0.943 32 H 0.063 0.937 33 H 0.072 0.928 34 H 0.074 0.926 35 H 0.034 0.966 36 H 0.089 0.911 37 H 0.070 0.930 38 H 0.020 0.980 39 H 0.103 0.897 40 H 0.063 0.937 41 H 0.399 0.601 42 H 0.072 0.928 43 H 0.069 0.931 44 H 0.077 0.923 45 H 0.069 0.931 46 H 0.041 0.959 47 H 0.094 0.906 48 H 0.088 0.912 49 H 0.048 0.952 50 H 0.391 0.609 51 H 0.270 0.730 52 H 0.080 0.920 53 H 0.057 0.943 For the charges calculated by CM2: Dipole moment (debyes) X Y Z Total from point charges -25.865 -16.368 -2.256 30.692 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 -0.209 4.209 2 C -0.160 4.160 3 C -0.073 4.073 4 N -0.250 5.250 5 C -0.132 4.132 6 C -0.096 4.096 7 C 0.297 3.703 8 O -0.397 6.397 9 N -0.384 5.384 10 C 0.010 3.990 11 C -0.143 4.143 12 H 0.099 0.901 13 C -0.163 4.163 14 C -0.075 4.075 15 N -0.229 5.229 16 C -0.091 4.091 17 C 0.230 3.770 18 O -0.461 6.461 19 N -0.204 5.204 20 C -0.427 4.427 21 H 0.121 0.879 22 C -0.180 4.180 23 N -0.545 5.545 24 Si 0.756 3.244 25 H -0.192 1.192 26 H -0.208 1.208 27 H -0.208 1.208 28 C -0.078 4.078 29 H 0.074 0.926 30 H 0.071 0.929 31 H 0.076 0.924 32 H 0.082 0.918 33 H 0.090 0.910 34 H 0.093 0.907 35 H 0.052 0.948 36 H 0.107 0.893 37 H 0.089 0.911 38 H 0.038 0.962 39 H 0.121 0.879 40 H 0.081 0.919 41 H 0.233 0.767 42 H 0.091 0.909 43 H 0.087 0.913 44 H 0.095 0.905 45 H 0.088 0.912 46 H 0.059 0.941 47 H 0.112 0.888 48 H 0.106 0.894 49 H 0.066 0.934 50 H 0.224 0.776 51 H 0.080 0.920 52 H 0.098 0.902 53 H 0.075 0.925 Dipole moment (debyes) X Y Z Total from point charges -24.759 -17.514 -2.926 30.468 hybrid contribution -0.485 2.054 0.333 2.136 sum -25.244 -15.460 -2.594 29.715 Atomic orbital electron populations 1.21741 0.95520 1.01899 1.01751 1.21537 0.95319 0.96112 1.02989 1.22220 0.86515 0.97776 1.00814 1.61657 1.07222 1.19676 1.36399 1.22624 1.02961 0.99508 0.88145 1.21984 0.93118 0.91749 1.02761 1.20480 0.89080 0.84017 0.76677 1.90690 1.71317 1.28225 1.49445 1.46010 1.09317 1.09543 1.73488 1.21336 0.79380 0.96383 1.01905 1.22662 0.97642 0.95230 0.98783 0.90065 1.22853 0.98701 0.97777 0.96957 1.23025 0.89855 0.94396 1.00176 1.63251 1.26759 1.08504 1.24359 1.22119 0.97637 0.95511 0.93845 1.19752 0.84740 0.84208 0.88319 1.90507 1.68225 1.73636 1.13690 1.41870 1.40089 1.29313 1.09102 1.19747 1.20301 1.09092 0.93545 0.87905 1.25243 0.98388 0.98792 0.95533 1.69624 1.41903 1.37575 1.05356 0.85815 0.79273 0.79695 0.79659 1.19229 1.20818 1.20763 1.22824 0.90860 0.96273 0.97884 0.92624 0.92887 0.92435 0.91822 0.90956 0.90718 0.94789 0.89292 0.91107 0.96152 0.87895 0.91889 0.76691 0.90943 0.91301 0.90460 0.91234 0.94068 0.88795 0.89394 0.93421 0.77556 0.91982 0.90174 0.92472 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 -0.15 -0.68 9.91 37.16 0.37 -0.31 16 2 C -0.12 -0.71 5.86 -26.73 -0.16 -0.86 16 3 C 0.05 0.33 4.96 -3.83 -0.02 0.31 16 4 N -0.53 -4.34 4.50 -244.38 -1.10 -5.44 16 5 C 0.02 0.13 9.01 60.07 0.54 0.67 16 6 C 0.04 0.24 5.45 -4.97 -0.03 0.21 16 7 C 0.51 4.93 7.55 -10.99 -0.08 4.84 16 8 O -0.52 -7.16 14.31 5.55 0.08 -7.08 16 9 N -0.73 -5.68 5.47 -60.29 -0.33 -6.01 16 10 C 0.13 1.23 4.97 -4.04 -0.02 1.21 16 11 C -0.12 -1.17 2.96 -88.80 -0.26 -1.43 16 12 H 0.08 0.69 8.14 -51.93 -0.42 0.27 16 13 C -0.12 -1.33 6.44 -24.59 -0.16 -1.48 16 14 C 0.05 0.80 5.75 -2.30 -0.01 0.79 16 15 N -0.50 -8.22 4.86 -232.70 -1.13 -9.35 16 16 C 0.04 0.72 5.05 -4.98 -0.03 0.69 16 17 C 0.44 10.49 7.58 -10.98 -0.08 10.41 16 18 O -0.58 -15.58 14.61 5.55 0.08 -15.50 16 19 N -0.57 -14.35 5.29 -10.96 -0.06 -14.41 16 20 C -0.30 -8.29 9.68 -14.93 -0.14 -8.44 16 21 H 0.10 3.02 7.16 -52.49 -0.38 2.64 16 22 C 0.02 0.58 5.50 -17.47 -0.10 0.49 16 23 N -0.90 -24.57 13.05 55.50 0.72 -23.84 16 24 Si 0.93 21.05 29.55 -169.99 -5.02 16.03 16 25 H -0.27 -6.08 7.11 56.52 0.40 -5.68 16 26 H -0.28 -6.29 7.11 56.52 0.40 -5.88 16 27 H -0.28 -6.30 7.11 56.52 0.40 -5.90 16 28 C 0.05 0.61 6.46 -2.84 -0.02 0.59 16 29 H 0.05 0.23 8.14 -51.93 -0.42 -0.19 16 30 H 0.05 0.22 8.14 -51.93 -0.42 -0.20 16 31 H 0.06 0.24 8.14 -51.93 -0.42 -0.18 16 32 H 0.06 0.38 6.47 -51.93 -0.34 0.05 16 33 H 0.07 0.49 8.14 -51.93 -0.42 0.07 16 34 H 0.07 0.40 7.93 -51.93 -0.41 -0.02 16 35 H 0.03 0.19 8.12 -51.93 -0.42 -0.23 16 36 H 0.09 0.96 5.88 -51.93 -0.31 0.65 16 37 H 0.07 0.54 6.30 -51.93 -0.33 0.21 16 38 H 0.02 0.15 8.14 -51.93 -0.42 -0.27 16 39 H 0.10 0.51 7.93 -51.93 -0.41 0.10 16 40 H 0.06 0.34 8.12 -51.93 -0.42 -0.08 16 41 H 0.40 2.10 8.47 -40.82 -0.35 1.75 16 42 H 0.07 0.77 8.00 -51.93 -0.42 0.35 16 43 H 0.07 0.68 8.14 -51.93 -0.42 0.26 16 44 H 0.08 0.86 7.94 -51.93 -0.41 0.45 16 45 H 0.07 0.59 8.14 -51.93 -0.42 0.17 16 46 H 0.04 0.63 7.62 -51.93 -0.40 0.23 16 47 H 0.09 1.70 7.38 -51.93 -0.38 1.32 16 48 H 0.09 1.42 8.03 -51.93 -0.42 1.00 16 49 H 0.05 0.76 7.85 -51.93 -0.41 0.36 16 50 H 0.39 9.48 7.90 -40.82 -0.32 9.16 16 51 H 0.27 6.95 8.31 -40.82 -0.34 6.61 16 52 H 0.08 0.95 7.82 -51.93 -0.41 0.55 16 53 H 0.06 0.63 7.55 -51.93 -0.39 0.24 16 LS Contribution 420.02 15.07 6.33 6.33 Total: -1.00 -33.73 420.02 -10.05 -43.78 By element: Atomic # 1 Polarization: 17.21 SS G_CDS: -9.43 Total: 7.79 kcal Atomic # 6 Polarization: 7.89 SS G_CDS: -0.20 Total: 7.69 kcal Atomic # 7 Polarization: -57.15 SS G_CDS: -1.89 Total: -59.05 kcal Atomic # 8 Polarization: -22.73 SS G_CDS: 0.16 Total: -22.57 kcal Atomic # 14 Polarization: 21.05 SS G_CDS: -5.02 Total: 16.03 kcal Total LS contribution 6.33 Total: 6.33 kcal Total: -33.73 -10.05 -43.78 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. ZINC001714645829.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 -21.107 kcal (2) G-P(sol) polarization free energy of solvation -33.730 kcal (3) G-ENP(sol) elect.-nuc.-pol. free energy of system -54.837 kcal (4) G-CDS(sol) cavity-dispersion-solvent structure free energy -10.052 kcal (5) G-P-CDS(sol) = G-P(sol) + G-CDS(sol) = (2) + (4) -43.782 kcal (6) G-S(sol) free energy of system = (1) + (5) -64.889 kcal 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED Total computer time = 0.75 seconds