Wall clock time and date at job start Wed Apr 1 2020 02:10:35 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 1.50705 * 1 3 3 C 1.38261 * 120.00080 * 2 1 4 4 C 1.38209 * 119.99841 * 179.97438 * 3 2 1 5 5 C 1.38247 * 120.00227 * 0.02562 * 4 3 2 6 6 C 1.38216 * 120.00098 * 359.80582 * 5 4 3 7 7 C 1.38211 * 119.99891 * 180.02562 * 2 1 3 8 8 C 1.50696 * 119.99850 * 359.97438 * 7 2 1 9 9 H 1.08998 * 115.56521 * 334.31203 * 8 7 2 10 10 C 1.53000 * 117.49635 * 188.62386 * 8 7 2 11 11 C 1.53002 * 60.00180 * 252.51164 * 10 8 7 12 12 H 1.08999 * 117.50410 * 107.51151 * 11 10 8 13 13 C 1.50701 * 117.49914 * 252.51641 * 11 10 8 14 14 O 1.21275 * 120.00198 * 68.60381 * 13 11 10 15 15 N 1.34787 * 119.99477 * 248.60249 * 13 11 10 16 16 C 1.46923 * 120.63199 * 0.02562 * 15 13 11 17 17 C 1.53194 * 108.77567 * 126.36642 * 16 15 13 18 18 C 1.53044 * 109.33722 * 54.62186 * 17 16 15 19 19 C 1.53050 * 109.53585 * 298.68207 * 18 17 16 20 20 H 1.08994 * 109.49565 * 301.34829 * 19 18 17 21 21 C 1.53000 * 109.49358 * 181.28531 * 19 18 17 22 22 N 1.46499 * 109.47100 * 65.06636 * 21 19 18 23 23 C 1.36939 * 119.99547 * 179.97438 * 22 21 19 24 24 H 1.07993 * 120.00716 * 359.97438 * 23 22 21 25 25 C 1.38817 * 119.99459 * 179.97438 * 23 22 21 26 26 N 1.31619 * 120.00154 * 359.97438 * 25 23 22 27 27 Si 1.86798 * 119.99635 * 179.97438 * 25 23 22 28 28 H 1.48506 * 109.47297 * 269.99668 * 27 25 23 29 29 H 1.48503 * 109.47261 * 149.99848 * 27 25 23 30 30 H 1.48500 * 109.47454 * 29.99841 * 27 25 23 31 31 C 1.46923 * 120.62625 * 179.97438 * 15 13 11 32 32 H 1.09006 * 109.46881 * 269.97960 * 1 2 3 33 33 H 1.09000 * 109.46931 * 29.97476 * 1 2 3 34 34 H 1.08998 * 109.47359 * 149.97715 * 1 2 3 35 35 H 1.08000 * 119.99699 * 0.02562 * 3 2 1 36 36 H 1.08004 * 119.99740 * 180.02562 * 4 3 2 37 37 H 1.08004 * 120.00449 * 180.02562 * 5 4 3 38 38 H 1.08004 * 120.00186 * 180.22835 * 6 5 4 39 39 H 1.08996 * 117.49905 * 145.02433 * 10 8 7 40 40 H 1.08996 * 117.50210 * 359.97438 * 10 8 7 41 41 H 1.08992 * 109.58684 * 246.15471 * 16 15 13 42 42 H 1.09002 * 109.58723 * 6.44195 * 16 15 13 43 43 H 1.08993 * 109.49634 * 174.58187 * 17 16 15 44 44 H 1.08998 * 109.49679 * 294.65339 * 17 16 15 45 45 H 1.08991 * 109.48719 * 178.64643 * 18 17 16 46 46 H 1.08997 * 109.43245 * 58.68332 * 18 17 16 47 47 H 1.08994 * 109.47445 * 305.06308 * 21 19 18 48 48 H 1.08999 * 109.46641 * 185.06437 * 21 19 18 49 49 H 0.96998 * 120.00185 * 359.97438 * 22 21 19 50 50 H 0.96993 * 120.00007 * 0.02562 * 26 25 23 51 51 H 1.09002 * 109.58325 * 113.84366 * 31 15 13 52 52 H 1.08996 * 109.59188 * 353.42311 * 31 15 13 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 1.5070 0.0000 0.0000 3 6 2.1984 1.1974 0.0000 4 6 3.5805 1.1973 0.0005 5 6 4.2717 0.0001 0.0005 6 6 3.5806 -1.1969 0.0041 7 6 2.1981 -1.1970 -0.0005 8 6 1.4445 -2.5020 -0.0005 9 1 0.4421 -2.4663 0.4261 10 6 2.2534 -3.7847 0.2024 11 6 1.6786 -3.4529 -1.1762 12 1 2.3775 -3.1348 -1.9497 13 6 0.5055 -4.2683 -1.6556 14 8 -0.5731 -4.1567 -1.1125 15 7 0.6551 -5.1218 -2.6881 16 6 1.9556 -5.2684 -3.3557 17 6 2.3390 -6.7515 -3.3682 18 6 1.2092 -7.5617 -4.0081 19 6 -0.0686 -7.3993 -3.1815 20 1 0.1129 -7.7366 -2.1611 21 6 -1.1889 -8.2350 -3.8039 22 7 -0.8471 -9.6565 -3.7109 23 6 -1.7066 -10.6011 -4.2053 24 1 -2.6364 -10.2982 -4.6634 25 6 -1.3824 -11.9480 -4.1176 26 7 -0.2489 -12.3172 -3.5598 27 14 -2.5551 -13.2365 -4.7914 28 1 -3.5020 -13.6502 -3.7248 29 1 -1.7814 -14.4176 -5.2517 30 1 -3.3141 -12.6664 -5.9333 31 6 -0.4791 -5.9240 -3.1664 32 1 -0.3633 -0.0004 1.0277 33 1 -0.3633 0.8902 -0.5134 34 1 -0.3634 -0.8897 -0.5142 35 1 1.6583 2.1327 0.0004 36 1 4.1205 2.1327 0.0010 37 1 5.3517 0.0000 0.0014 38 1 4.1206 -2.1323 0.0078 39 1 1.7832 -4.5930 0.7624 40 1 3.3306 -3.6848 0.3354 41 1 1.8844 -4.9008 -4.3793 42 1 2.7106 -4.6983 -2.8144 43 1 3.2543 -6.8858 -3.9445 44 1 2.4990 -7.0946 -2.3461 45 1 1.4897 -8.6144 -4.0401 46 1 1.0341 -7.2017 -5.0219 47 1 -1.3099 -7.9582 -4.8511 48 1 -2.1204 -8.0495 -3.2691 49 1 -0.0121 -9.9287 -3.2991 50 1 0.3598 -11.6481 -3.2096 51 1 -0.7493 -5.6098 -4.1746 52 1 -1.3300 -5.7884 -2.4989 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 ZINC001491180161.mol2 52 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED SCF FIELD WAS ACHIEVED Wall clock time and date at job start Wed Apr 1 2020 02:10:35 Heat of formation + Delta-G solvation = 14.970307 kcal Electronic energy + Delta-G solvation = -29368.718146 eV Core-core repulsion = 25526.402489 eV Total energy + Delta-G solvation = -3842.315656 eV No. of doubly occupied orbitals = 65 Molecular weight (most abundant/longest-lived isotopes) = 342.205 amu Computer time = 1.20 seconds Orbital eigenvalues (eV) -40.79373 -39.78629 -38.01887 -36.43393 -35.17086 -33.18032 -32.94375 -31.78747 -30.94933 -29.78305 -27.24527 -26.14567 -25.45394 -24.33037 -23.65632 -22.64114 -21.95772 -21.74728 -20.58998 -19.91742 -18.81760 -17.83460 -17.27956 -16.69217 -16.26863 -15.56670 -15.28056 -15.19733 -14.78687 -14.72131 -14.37275 -14.19694 -14.13572 -13.97463 -13.66234 -13.43048 -13.24383 -13.11979 -12.78698 -12.59246 -12.56181 -12.47077 -12.24144 -12.15342 -11.86743 -11.48528 -11.24280 -11.12291 -10.94292 -10.84647 -10.74732 -10.72510 -10.51424 -10.39112 -10.19877 -10.01176 -9.81886 -9.18291 -9.10495 -8.86809 -8.79378 -8.63988 -6.98303 -6.09393 -3.08463 0.94652 1.04663 2.37247 2.83173 3.29825 3.52764 3.57767 3.71520 3.74059 4.10282 4.36640 4.46386 4.50380 4.58497 4.65567 4.68069 4.69676 4.77449 4.86959 4.93700 4.97746 5.00459 5.10472 5.20526 5.29478 5.30071 5.35966 5.38290 5.43479 5.52408 5.55592 5.59928 5.62813 5.73067 5.76610 5.77796 5.80215 5.89412 5.92455 5.99148 6.01595 6.12517 6.17179 6.17987 6.34923 6.37764 6.47898 6.54316 6.66779 6.71516 6.81522 7.33322 7.83059 8.09364 8.77146 9.24643 10.10958 10.26247 11.39349 Molecular weight = 342.20amu Principal moments of inertia in cm(-1) A = 0.027953 B = 0.001879 C = 0.001825 Principal moments of inertia in units of 10**(-40)*gram-cm**2 A = 1001.448461 B =14895.557064 C =15341.018494 Net atomic charges, atomic populations, and dipole contributions calculated with CM2 Atom NO. Type Charge No. of electrons 1 C -0.122 4.122 2 C -0.073 4.073 3 C -0.120 4.120 4 C -0.120 4.120 5 C -0.124 4.124 6 C -0.116 4.116 7 C -0.053 4.053 8 C -0.085 4.085 9 H 0.129 0.871 10 C -0.143 4.143 11 C -0.176 4.176 12 H 0.125 0.875 13 C 0.544 3.456 14 O -0.542 6.542 15 N -0.604 5.604 16 C 0.107 3.893 17 C -0.135 4.135 18 C -0.111 4.111 19 C -0.107 4.107 20 H 0.072 0.928 21 C 0.165 3.835 22 N -0.742 5.742 23 C -0.330 4.330 24 H 0.065 0.935 25 C -0.047 4.047 26 N -0.945 5.945 27 Si 1.083 2.917 28 H -0.295 1.295 29 H -0.288 1.288 30 H -0.295 1.295 31 C 0.120 3.880 32 H 0.072 0.928 33 H 0.065 0.935 34 H 0.075 0.925 35 H 0.122 0.878 36 H 0.120 0.880 37 H 0.121 0.879 38 H 0.124 0.876 39 H 0.106 0.894 40 H 0.108 0.892 41 H 0.068 0.932 42 H 0.083 0.917 43 H 0.074 0.926 44 H 0.066 0.934 45 H 0.075 0.925 46 H 0.062 0.938 47 H 0.021 0.979 48 H 0.021 0.979 49 H 0.367 0.633 50 H 0.254 0.746 51 H 0.068 0.932 52 H 0.092 0.908 For the charges calculated by CM2: Dipole moment (debyes) X Y Z Total from point charges 10.942 28.131 6.022 30.779 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 -0.178 4.178 2 C -0.073 4.073 3 C -0.138 4.138 4 C -0.138 4.138 5 C -0.142 4.142 6 C -0.134 4.134 7 C -0.053 4.053 8 C -0.104 4.104 9 H 0.147 0.853 10 C -0.181 4.181 11 C -0.197 4.197 12 H 0.143 0.857 13 C 0.332 3.668 14 O -0.419 6.419 15 N -0.336 5.336 16 C -0.016 4.016 17 C -0.173 4.173 18 C -0.149 4.149 19 C -0.127 4.127 20 H 0.090 0.910 21 C 0.037 3.963 22 N -0.387 5.387 23 C -0.461 4.461 24 H 0.083 0.917 25 C -0.244 4.244 26 N -0.591 5.591 27 Si 0.914 3.086 28 H -0.223 1.223 29 H -0.214 1.214 30 H -0.222 1.222 31 C -0.003 4.003 32 H 0.090 0.910 33 H 0.084 0.916 34 H 0.094 0.906 35 H 0.140 0.860 36 H 0.139 0.861 37 H 0.139 0.861 38 H 0.142 0.858 39 H 0.124 0.876 40 H 0.126 0.874 41 H 0.087 0.913 42 H 0.101 0.899 43 H 0.092 0.908 44 H 0.085 0.915 45 H 0.093 0.907 46 H 0.080 0.920 47 H 0.039 0.961 48 H 0.039 0.961 49 H 0.200 0.800 50 H 0.065 0.935 51 H 0.086 0.914 52 H 0.111 0.889 Dipole moment (debyes) X Y Z Total from point charges 9.897 26.619 5.958 29.017 hybrid contribution 0.629 1.559 0.172 1.689 sum 10.525 28.177 6.130 30.697 Atomic orbital electron populations 1.20887 0.90984 1.03342 1.02615 1.19770 0.96278 0.92322 0.98928 1.21040 0.94289 0.97405 1.01064 1.21137 0.94307 0.98088 1.00313 1.21097 0.99837 0.92418 1.00880 1.21063 0.93515 0.98374 1.00444 1.18988 0.92998 0.92692 1.00644 1.21101 1.00941 0.87871 1.00443 0.85342 1.23143 1.00362 0.98879 0.95671 1.22357 1.00352 1.03416 0.93599 0.85703 1.19576 0.88626 0.79388 0.79225 1.90687 1.27685 1.66941 1.56636 1.48016 1.11702 1.40929 1.32933 1.21807 0.84391 0.97655 0.97715 1.21940 0.99096 0.94254 1.02001 1.21526 0.93742 1.00994 0.98607 1.21676 0.96567 0.93910 1.00530 0.90968 1.20519 0.93993 0.84842 0.96918 1.42348 1.23261 1.00218 1.72920 1.20076 1.01326 0.89264 1.35435 0.91732 1.25779 1.01003 0.96545 1.01082 1.70852 1.10518 1.35636 1.42105 0.83186 0.74300 0.75582 0.75507 1.22329 1.21397 1.22168 1.21629 0.88796 0.89872 0.99982 0.90978 0.91568 0.90621 0.86028 0.86148 0.86071 0.85829 0.87580 0.87373 0.91336 0.89851 0.90767 0.91505 0.90670 0.91959 0.96080 0.96108 0.79988 0.93474 0.91375 0.88948 Number of geometries 1 Number of calculations of the screened coulomb radii 1 The total number of SCF iterations 14. 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 -0.12 -0.98 9.33 36.01 0.34 -0.65 16 2 C -0.07 -0.65 5.88 -104.62 -0.62 -1.26 16 3 C -0.12 -0.94 9.70 -39.58 -0.38 -1.32 16 4 C -0.12 -0.86 10.05 -39.59 -0.40 -1.26 16 5 C -0.12 -0.90 10.05 -39.59 -0.40 -1.29 16 6 C -0.12 -0.91 9.30 -39.58 -0.37 -1.28 16 7 C -0.05 -0.48 5.61 -104.63 -0.59 -1.07 16 8 C -0.09 -0.82 4.66 -91.77 -0.43 -1.25 16 9 H 0.13 1.42 6.43 -51.93 -0.33 1.08 16 10 C -0.14 -1.22 9.56 -26.73 -0.26 -1.48 16 11 C -0.18 -1.73 4.60 -91.77 -0.42 -2.15 16 12 H 0.13 1.02 6.81 -51.93 -0.35 0.67 16 13 C 0.54 7.27 7.48 -10.98 -0.08 7.18 16 14 O -0.54 -9.14 15.67 5.56 0.09 -9.05 16 15 N -0.60 -7.65 2.97 -172.80 -0.51 -8.16 16 16 C 0.11 1.05 6.30 -3.71 -0.02 1.03 16 17 C -0.13 -1.50 6.08 -26.61 -0.16 -1.66 16 18 C -0.11 -1.63 5.06 -26.68 -0.13 -1.76 16 19 C -0.11 -1.75 2.37 -90.52 -0.21 -1.97 16 20 H 0.07 1.29 8.14 -51.93 -0.42 0.87 16 21 C 0.17 3.40 5.65 -4.04 -0.02 3.38 16 22 N -0.74 -18.91 5.32 -59.91 -0.32 -19.23 16 23 C -0.33 -9.49 9.99 -15.06 -0.15 -9.64 16 24 H 0.06 1.84 7.83 -52.49 -0.41 1.42 16 25 C -0.05 -1.38 5.50 -17.43 -0.10 -1.48 16 26 N -0.95 -29.49 13.70 55.49 0.76 -28.73 16 27 Si 1.08 26.33 29.92 -169.99 -5.09 21.24 16 28 H -0.30 -7.00 7.11 56.52 0.40 -6.60 16 29 H -0.29 -7.03 7.11 56.52 0.40 -6.62 16 30 H -0.29 -6.77 7.11 56.52 0.40 -6.36 16 31 C 0.12 1.73 5.71 -3.74 -0.02 1.71 16 32 H 0.07 0.53 8.14 -51.93 -0.42 0.11 16 33 H 0.07 0.45 8.09 -51.93 -0.42 0.03 16 34 H 0.07 0.71 6.65 -51.93 -0.35 0.37 16 35 H 0.12 0.73 8.06 -52.49 -0.42 0.31 16 36 H 0.12 0.61 8.06 -52.48 -0.42 0.19 16 37 H 0.12 0.63 8.06 -52.48 -0.42 0.21 16 38 H 0.12 0.77 6.02 -52.48 -0.32 0.46 16 39 H 0.11 1.00 8.14 -51.93 -0.42 0.58 16 40 H 0.11 0.69 6.17 -51.93 -0.32 0.37 16 41 H 0.07 0.62 8.14 -51.93 -0.42 0.19 16 42 H 0.08 0.64 5.67 -51.93 -0.29 0.34 16 43 H 0.07 0.70 8.14 -51.93 -0.42 0.28 16 44 H 0.07 0.79 8.14 -51.93 -0.42 0.37 16 45 H 0.07 1.29 7.16 -51.93 -0.37 0.92 16 46 H 0.06 0.89 8.14 -51.93 -0.42 0.47 16 47 H 0.02 0.44 8.14 -51.93 -0.42 0.01 16 48 H 0.02 0.45 8.14 -51.93 -0.42 0.02 16 49 H 0.37 9.49 5.68 -40.82 -0.23 9.25 16 50 H 0.25 7.79 6.77 -40.82 -0.28 7.51 16 51 H 0.07 0.92 8.14 -51.93 -0.42 0.50 16 52 H 0.09 1.49 7.00 -51.93 -0.36 1.12 16 LS Contribution 407.66 15.07 6.14 6.14 Total: -1.00 -34.27 407.66 -11.68 -45.95 By element: Atomic # 1 Polarization: 16.39 SS G_CDS: -8.33 Total: 8.06 kcal Atomic # 6 Polarization: -11.80 SS G_CDS: -4.43 Total: -16.22 kcal Atomic # 7 Polarization: -56.05 SS G_CDS: -0.07 Total: -56.12 kcal Atomic # 8 Polarization: -9.14 SS G_CDS: 0.09 Total: -9.05 kcal Atomic # 14 Polarization: 26.33 SS G_CDS: -5.09 Total: 21.24 kcal Total LS contribution 6.14 Total: 6.14 kcal Total: -34.27 -11.68 -45.95 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. ZINC001491180161.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 60.920 kcal (2) G-P(sol) polarization free energy of solvation -34.265 kcal (3) G-ENP(sol) elect.-nuc.-pol. free energy of system 26.655 kcal (4) G-CDS(sol) cavity-dispersion-solvent structure free energy -11.685 kcal (5) G-P-CDS(sol) = G-P(sol) + G-CDS(sol) = (2) + (4) -45.950 kcal (6) G-S(sol) free energy of system = (1) + (5) 14.970 kcal 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED Total computer time = 1.20 seconds