Wall clock time and date at job start Tue Mar 31 2020 19:24:16 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 1.53001 * 1 3 3 C 1.53004 * 109.46947 * 2 1 4 4 H 1.08992 * 109.49282 * 54.97085 * 3 2 1 5 5 C 1.53089 * 109.47879 * 175.00324 * 3 2 1 6 6 C 1.53178 * 109.16365 * 177.58956 * 5 3 2 7 7 H 1.09000 * 109.54248 * 62.88025 * 6 5 3 8 8 C 1.50699 * 109.54577 * 183.15126 * 6 5 3 9 9 O 1.21274 * 119.99787 * 21.60701 * 8 6 5 10 10 N 1.34773 * 119.99704 * 201.60973 * 8 6 5 11 11 C 1.46886 * 120.46050 * 183.98088 * 10 8 6 12 12 C 1.52859 * 109.01606 * 235.48408 * 11 10 8 13 13 C 1.52670 * 109.18010 * 307.82144 * 12 11 10 14 14 C 1.53482 * 113.62536 * 188.99406 * 13 12 11 15 15 N 1.47677 * 85.98607 * 137.70706 * 14 13 12 16 16 C 1.36928 * 134.45656 * 155.65205 * 15 14 13 17 17 H 1.08000 * 120.00082 * 180.02562 * 16 15 14 18 18 C 1.38812 * 120.00286 * 0.03969 * 16 15 14 19 19 N 1.31617 * 119.99821 * 0.02562 * 18 16 15 20 20 Si 1.86803 * 120.00353 * 180.02562 * 18 16 15 21 21 H 1.48495 * 109.46931 * 60.00302 * 20 18 16 22 22 H 1.48494 * 109.46990 * 180.02562 * 20 18 16 23 23 H 1.48497 * 109.47226 * 300.00375 * 20 18 16 24 24 C 1.47669 * 91.08549 * 335.67804 * 15 14 13 25 25 C 1.52672 * 113.18503 * 57.45628 * 13 12 11 26 26 C 1.46880 * 120.46954 * 4.25880 * 10 8 6 27 27 C 1.53183 * 109.03410 * 303.01689 * 6 5 3 28 28 C 1.53089 * 109.16271 * 56.97971 * 27 6 5 29 29 O 1.42905 * 109.42809 * 302.38588 * 28 27 6 30 30 H 1.09000 * 109.47476 * 60.00099 * 1 2 3 31 31 H 1.08995 * 109.46867 * 180.02562 * 1 2 3 32 32 H 1.09000 * 109.47052 * 300.00151 * 1 2 3 33 33 H 1.09000 * 109.47052 * 239.99849 * 2 1 3 34 34 H 1.09004 * 109.47122 * 119.99256 * 2 1 3 35 35 H 1.08998 * 109.52648 * 57.67866 * 5 3 2 36 36 H 1.09005 * 109.51969 * 297.49207 * 5 3 2 37 37 H 1.08999 * 109.59333 * 355.31058 * 11 10 8 38 38 H 1.09003 * 109.59114 * 115.74657 * 11 10 8 39 39 H 1.09006 * 109.61012 * 187.83874 * 12 11 10 40 40 H 1.09004 * 109.44698 * 67.70210 * 12 11 10 41 41 H 1.08994 * 113.79038 * 251.97259 * 14 13 12 42 42 H 1.08995 * 113.78934 * 23.44079 * 14 13 12 43 43 H 0.97008 * 120.00337 * 179.97438 * 19 18 16 44 44 H 1.09000 * 113.79413 * 270.05065 * 24 15 14 45 45 H 1.08999 * 113.78923 * 138.57718 * 24 15 14 46 46 H 1.08996 * 109.53287 * 182.51526 * 25 13 12 47 47 H 1.09005 * 109.52953 * 62.30071 * 25 13 12 48 48 H 1.09009 * 109.58749 * 244.25751 * 26 10 8 49 49 H 1.08993 * 109.58610 * 4.68618 * 26 10 8 50 50 H 1.08994 * 109.52267 * 297.07196 * 27 6 5 51 51 H 1.09000 * 109.51962 * 176.88758 * 27 6 5 52 52 H 1.08999 * 109.48109 * 62.37471 * 28 27 6 53 53 H 1.09000 * 109.48210 * 182.39253 * 28 27 6 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 1 1.6052 1.9820 0.8413 5 6 3.5657 1.4446 0.1257 6 6 4.0733 2.8885 0.0644 7 1 3.6791 3.4499 0.9115 8 6 5.5796 2.8958 0.1096 9 8 6.2005 1.9031 -0.2064 10 7 6.2367 4.0054 0.5012 11 6 7.7043 4.0531 0.4662 12 6 8.2241 4.4187 1.8564 13 6 7.5213 5.6858 2.3375 14 6 8.1187 6.2694 3.6252 15 7 7.9692 7.5865 2.9744 16 6 7.8433 8.8720 3.4290 17 1 7.7449 9.6861 2.7262 18 6 7.8423 9.1289 4.7931 19 7 7.9630 8.1369 5.6497 20 14 7.6698 10.8825 5.4133 21 1 6.3817 11.4502 4.9405 22 1 7.6982 10.8875 6.8979 23 1 8.7929 11.7039 4.8944 24 6 8.0093 6.9617 1.6370 25 6 6.0008 5.5528 2.3740 26 6 5.4955 5.1818 0.9748 27 6 3.5968 3.5306 -1.2422 28 6 2.0699 3.4479 -1.3152 29 8 1.6629 2.0812 -1.2218 30 1 -0.3634 0.5138 -0.8900 31 1 -0.3633 -1.0276 0.0005 32 1 -0.3633 0.5139 0.8900 33 1 1.8933 -0.5139 -0.8900 34 1 1.8934 -0.5137 0.8901 35 1 3.9995 0.8709 -0.6933 36 1 3.8534 0.9975 1.0773 37 1 8.0950 3.0776 0.1767 38 1 8.0285 4.8066 -0.2517 39 1 9.2992 4.5931 1.8109 40 1 8.0165 3.6020 2.5478 41 1 7.4855 6.1380 4.5026 42 1 9.1551 5.9802 3.7995 43 1 7.9627 8.3164 6.6030 44 1 9.0131 6.8782 1.2205 45 1 7.2889 7.3804 0.9344 46 1 5.5594 6.5007 2.6815 47 1 5.7202 4.7724 3.0815 48 1 5.6607 6.0164 0.2934 49 1 4.4316 4.9494 1.0201 50 1 4.0312 2.9990 -2.0888 51 1 3.9068 4.5752 -1.2690 52 1 1.6354 4.0136 -0.4910 53 1 1.7281 3.8651 -2.2624 RHF calculation, no. of doubly occupied orbitals= 65 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 ZINC001035832786.mol2 53 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED SCF FIELD WAS ACHIEVED Wall clock time and date at job start Tue Mar 31 2020 19:24:16 Heat of formation + Delta-G solvation = -42.583191 kcal Electronic energy + Delta-G solvation = -30713.740169 eV Core-core repulsion = 26779.387416 eV Total energy + Delta-G solvation = -3934.352753 eV No. of doubly occupied orbitals = 65 Molecular weight (most abundant/longest-lived isotopes) = 336.220 amu Computer time = 0.90 seconds Orbital eigenvalues (eV) -40.81158 -39.56393 -38.47294 -35.75859 -34.37111 -33.94451 -32.48389 -31.06900 -30.35673 -30.07696 -27.13831 -26.09990 -25.03782 -24.07147 -23.51613 -23.17502 -22.02540 -21.21336 -20.62614 -19.21714 -17.80064 -16.83800 -16.74257 -16.63132 -16.34747 -15.68615 -15.24049 -14.90059 -14.79683 -14.65318 -14.25907 -14.07038 -13.90445 -13.77864 -13.60581 -13.55032 -13.28181 -12.78941 -12.68217 -12.24077 -12.15990 -12.08234 -11.98489 -11.71503 -11.55060 -11.39226 -11.16725 -11.09383 -11.08008 -10.91759 -10.89621 -10.85818 -10.59120 -10.41037 -10.23648 -9.97511 -9.72574 -9.55766 -9.43322 -9.36762 -8.80276 -8.44897 -6.87754 -5.77673 -3.09618 2.61654 3.02165 3.37138 3.41712 3.42903 3.50897 4.28518 4.36449 4.44214 4.50026 4.62964 4.76944 4.84827 4.89017 5.01075 5.03167 5.05740 5.13694 5.14758 5.18399 5.32000 5.35791 5.37743 5.43534 5.44773 5.49378 5.58116 5.59298 5.62900 5.70408 5.73976 5.81159 5.84700 5.85960 5.88174 5.97911 6.03142 6.09237 6.14957 6.25278 6.32372 6.47274 6.56683 6.62456 6.78563 6.81162 6.98728 7.22502 7.35701 7.47590 7.56581 7.97585 8.20245 9.03872 9.70113 10.60658 11.39146 Molecular weight = 336.22amu Principal moments of inertia in cm(-1) A = 0.017756 B = 0.002534 C = 0.002393 Principal moments of inertia in units of 10**(-40)*gram-cm**2 A = 1576.559194 B =11046.049637 C =11699.735694 Net atomic charges, atomic populations, and dipole contributions calculated with CM2 Atom NO. Type Charge No. of electrons 1 C -0.150 4.150 2 C -0.116 4.116 3 C 0.091 3.909 4 H 0.059 0.941 5 C -0.131 4.131 6 C -0.111 4.111 7 H 0.096 0.904 8 C 0.520 3.480 9 O -0.548 6.548 10 N -0.603 5.603 11 C 0.114 3.886 12 C -0.117 4.117 13 C -0.108 4.108 14 C 0.174 3.826 15 N -0.610 5.610 16 C -0.222 4.222 17 H 0.077 0.923 18 C -0.008 4.008 19 N -0.921 5.921 20 Si 0.910 3.090 21 H -0.285 1.285 22 H -0.290 1.290 23 H -0.286 1.286 24 C 0.127 3.873 25 C -0.098 4.098 26 C 0.105 3.895 27 C -0.144 4.144 28 C 0.065 3.935 29 O -0.377 6.377 30 H 0.061 0.939 31 H 0.053 0.947 32 H 0.052 0.948 33 H 0.071 0.929 34 H 0.076 0.924 35 H 0.084 0.916 36 H 0.076 0.924 37 H 0.086 0.914 38 H 0.066 0.934 39 H 0.074 0.926 40 H 0.062 0.938 41 H 0.071 0.929 42 H 0.025 0.975 43 H 0.254 0.746 44 H 0.031 0.969 45 H 0.040 0.960 46 H 0.088 0.912 47 H 0.060 0.940 48 H 0.071 0.929 49 H 0.080 0.920 50 H 0.078 0.922 51 H 0.080 0.920 52 H 0.053 0.947 53 H 0.097 0.903 For the charges calculated by CM2: Dipole moment (debyes) X Y Z Total from point charges -12.234 -13.195 -12.463 21.889 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 -0.207 4.207 2 C -0.153 4.153 3 C 0.033 3.967 4 H 0.077 0.923 5 C -0.169 4.169 6 C -0.132 4.132 7 H 0.114 0.886 8 C 0.308 3.692 9 O -0.426 6.426 10 N -0.336 5.336 11 C -0.008 4.008 12 C -0.156 4.156 13 C -0.110 4.110 14 C 0.048 3.952 15 N -0.335 5.335 16 C -0.350 4.350 17 H 0.095 0.905 18 C -0.204 4.204 19 N -0.569 5.569 20 Si 0.740 3.260 21 H -0.211 1.211 22 H -0.216 1.216 23 H -0.213 1.213 24 C 0.001 3.999 25 C -0.136 4.136 26 C -0.017 4.017 27 C -0.182 4.182 28 C -0.012 4.012 29 O -0.296 6.296 30 H 0.080 0.920 31 H 0.072 0.928 32 H 0.071 0.929 33 H 0.090 0.910 34 H 0.095 0.905 35 H 0.102 0.898 36 H 0.094 0.906 37 H 0.105 0.895 38 H 0.084 0.916 39 H 0.092 0.908 40 H 0.081 0.919 41 H 0.090 0.910 42 H 0.042 0.958 43 H 0.064 0.936 44 H 0.049 0.951 45 H 0.058 0.942 46 H 0.107 0.893 47 H 0.079 0.921 48 H 0.089 0.911 49 H 0.099 0.901 50 H 0.096 0.904 51 H 0.099 0.901 52 H 0.071 0.929 53 H 0.115 0.885 Dipole moment (debyes) X Y Z Total from point charges -12.018 -13.541 -12.516 22.010 hybrid contribution 0.453 1.413 0.778 1.675 sum -11.565 -12.128 -11.738 20.460 Atomic orbital electron populations 1.21720 0.95247 1.01486 1.02246 1.21539 0.96610 0.94258 1.02939 1.22185 0.93241 0.94221 0.87057 0.92307 1.22077 0.95505 0.95135 1.04193 1.21402 0.92775 0.98934 1.00107 0.88647 1.20454 0.89687 0.82423 0.76604 1.90658 1.69317 1.33040 1.49560 1.48129 1.07308 1.14321 1.63800 1.21516 0.78917 1.02432 0.97921 1.21734 1.00112 0.98134 0.95652 1.22367 0.94801 0.93012 1.00786 1.22226 0.96729 0.82824 0.93400 1.45981 1.84751 1.02539 1.00279 1.18956 1.42898 0.82406 0.90715 0.90495 1.24762 1.02536 0.97452 0.95690 1.69806 1.56325 1.29491 1.01230 0.86239 0.77943 0.84075 0.77734 1.21130 1.21598 1.21272 1.22586 0.96904 0.90365 0.90079 1.21494 0.94956 1.02497 0.94618 1.21930 0.95619 0.87346 0.96826 1.22153 0.97378 1.01799 0.96907 1.22541 0.92928 0.83323 1.02412 1.87932 1.78471 1.24577 1.38644 0.91953 0.92823 0.92937 0.91007 0.90535 0.89755 0.90560 0.89548 0.91582 0.90773 0.91928 0.91025 0.95760 0.93644 0.95146 0.94231 0.89344 0.92093 0.91057 0.90136 0.90361 0.90144 0.92892 0.88489 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 C -0.15 -1.08 9.81 37.16 0.36 -0.72 16 2 C -0.12 -0.92 5.64 -26.73 -0.15 -1.07 16 3 C 0.09 0.81 2.64 -26.68 -0.07 0.74 16 4 H 0.06 0.49 8.14 -51.93 -0.42 0.07 16 5 C -0.13 -1.34 4.25 -26.59 -0.11 -1.45 16 6 C -0.11 -1.15 1.76 -91.59 -0.16 -1.31 16 7 H 0.10 0.88 6.27 -51.93 -0.33 0.56 16 8 C 0.52 7.02 6.84 -10.99 -0.08 6.94 16 9 O -0.55 -9.18 15.39 5.56 0.09 -9.09 16 10 N -0.60 -7.88 2.95 -172.96 -0.51 -8.39 16 11 C 0.11 1.55 6.29 -3.90 -0.02 1.53 16 12 C -0.12 -1.74 5.24 -26.97 -0.14 -1.88 16 13 C -0.11 -1.88 0.77 -154.42 -0.12 -2.00 16 14 C 0.17 3.94 6.64 -3.16 -0.02 3.92 16 15 N -0.61 -15.02 3.53 -179.75 -0.64 -15.66 16 16 C -0.22 -6.07 10.70 -15.06 -0.16 -6.23 16 17 H 0.08 2.03 7.83 -52.49 -0.41 1.62 16 18 C -0.01 -0.22 5.50 -17.43 -0.10 -0.32 16 19 N -0.92 -26.89 11.39 55.49 0.63 -26.25 16 20 Si 0.91 21.81 29.55 -169.99 -5.02 16.79 16 21 H -0.28 -6.68 7.11 56.52 0.40 -6.28 16 22 H -0.29 -7.03 7.11 56.52 0.40 -6.63 16 23 H -0.29 -6.80 7.11 56.52 0.40 -6.40 16 24 C 0.13 2.45 7.73 -3.14 -0.02 2.42 16 25 C -0.10 -1.51 5.21 -26.73 -0.14 -1.65 16 26 C 0.11 1.27 5.80 -3.66 -0.02 1.25 16 27 C -0.14 -1.29 5.32 -26.59 -0.14 -1.43 16 28 C 0.06 0.52 6.84 37.20 0.25 0.77 16 29 O -0.38 -3.74 9.95 -35.23 -0.35 -4.09 16 30 H 0.06 0.50 7.82 -51.93 -0.41 0.09 16 31 H 0.05 0.34 8.14 -51.93 -0.42 -0.09 16 32 H 0.05 0.36 8.14 -51.93 -0.42 -0.06 16 33 H 0.07 0.60 8.14 -51.93 -0.42 0.18 16 34 H 0.08 0.53 8.14 -51.93 -0.42 0.11 16 35 H 0.08 1.00 7.78 -51.93 -0.40 0.60 16 36 H 0.08 0.78 8.14 -51.93 -0.42 0.36 16 37 H 0.09 1.22 6.97 -51.93 -0.36 0.86 16 38 H 0.07 0.85 8.08 -51.93 -0.42 0.43 16 39 H 0.07 1.08 8.12 -51.93 -0.42 0.66 16 40 H 0.06 0.95 8.14 -51.93 -0.42 0.53 16 41 H 0.07 1.81 7.12 -51.93 -0.37 1.44 16 42 H 0.02 0.58 8.09 -51.93 -0.42 0.16 16 43 H 0.25 7.22 8.31 -40.82 -0.34 6.88 16 44 H 0.03 0.58 8.07 -51.93 -0.42 0.17 16 45 H 0.04 0.72 7.41 -51.93 -0.38 0.34 16 46 H 0.09 1.57 8.01 -51.93 -0.42 1.15 16 47 H 0.06 0.93 8.14 -51.93 -0.42 0.51 16 48 H 0.07 0.85 7.49 -51.92 -0.39 0.46 16 49 H 0.08 0.79 5.30 -51.93 -0.28 0.52 16 50 H 0.08 0.79 8.14 -51.93 -0.42 0.37 16 51 H 0.08 0.65 7.71 -51.93 -0.40 0.25 16 52 H 0.05 0.37 8.14 -51.93 -0.42 -0.05 16 53 H 0.10 0.64 8.14 -51.93 -0.42 0.22 16 LS Contribution 401.01 15.07 6.04 6.04 Total: -1.00 -31.92 401.01 -10.21 -42.13 By element: Atomic # 1 Polarization: 8.61 SS G_CDS: -9.61 Total: -1.00 kcal Atomic # 6 Polarization: 0.37 SS G_CDS: -0.84 Total: -0.48 kcal Atomic # 7 Polarization: -49.79 SS G_CDS: -0.51 Total: -50.30 kcal Atomic # 8 Polarization: -12.91 SS G_CDS: -0.26 Total: -13.18 kcal Atomic # 14 Polarization: 21.81 SS G_CDS: -5.02 Total: 16.79 kcal Total LS contribution 6.04 Total: 6.04 kcal Total: -31.92 -10.21 -42.13 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. ZINC001035832786.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 -0.458 kcal (2) G-P(sol) polarization free energy of solvation -31.916 kcal (3) G-ENP(sol) elect.-nuc.-pol. free energy of system -32.374 kcal (4) G-CDS(sol) cavity-dispersion-solvent structure free energy -10.209 kcal (5) G-P-CDS(sol) = G-P(sol) + G-CDS(sol) = (2) + (4) -42.125 kcal (6) G-S(sol) free energy of system = (1) + (5) -42.583 kcal 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED Total computer time = 0.90 seconds