Wall clock time and date at job start Sat Apr 11 2020 06:08:59 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 N 1.46499 * 1 3 3 C 1.34780 * 120.00229 * 2 1 4 4 O 1.21279 * 120.00031 * 180.02562 * 3 2 1 5 5 C 1.50699 * 119.99563 * 0.02562 * 3 2 1 6 6 S 1.81004 * 109.46896 * 179.97438 * 5 3 2 7 7 C 1.76205 * 99.99950 * 180.02562 * 6 5 3 8 8 H 1.07997 * 120.00211 * 359.97438 * 7 6 5 9 9 C 1.38799 * 119.99841 * 179.97438 * 7 6 5 10 10 N 1.31627 * 120.00169 * 359.97438 * 9 7 6 11 11 Si 1.86797 * 119.99783 * 179.97438 * 9 7 6 12 12 H 1.48495 * 109.47431 * 59.99947 * 11 9 7 13 13 H 1.48498 * 109.46999 * 180.02562 * 11 9 7 14 14 H 1.48502 * 109.47273 * 299.99809 * 11 9 7 15 15 C 1.46499 * 120.00225 * 180.02562 * 2 1 3 16 16 C 1.53787 * 113.61053 * 39.13474 * 15 2 1 17 17 C 1.53959 * 87.01571 * 220.04775 * 16 15 2 18 18 N 1.46902 * 113.66220 * 139.93720 * 17 16 15 19 19 C 1.46897 * 111.00485 * 107.44345 * 18 17 16 20 20 C 1.53001 * 109.47479 * 180.02562 * 19 18 17 21 21 C 1.53007 * 109.46552 * 294.99639 * 20 19 18 22 22 C 1.53000 * 109.46919 * 180.02562 * 21 20 19 23 23 C 1.53002 * 109.47248 * 59.99797 * 22 21 20 24 24 C 1.52997 * 109.46956 * 300.00025 * 23 22 21 25 25 C 1.52998 * 109.47229 * 60.00305 * 24 23 22 26 26 C 1.53777 * 87.11258 * 25.36475 * 17 16 15 27 27 H 1.09002 * 109.47391 * 89.99442 * 1 2 3 28 28 H 1.09001 * 109.46813 * 329.99499 * 1 2 3 29 29 H 1.09004 * 109.47041 * 209.99626 * 1 2 3 30 30 H 1.09004 * 109.47017 * 299.99442 * 5 3 2 31 31 H 1.09002 * 109.47507 * 59.99434 * 5 3 2 32 32 H 0.97001 * 120.00208 * 180.02562 * 10 9 7 33 33 H 1.08995 * 112.85252 * 170.32982 * 15 2 1 34 34 H 1.08992 * 113.61654 * 334.56584 * 16 15 2 35 35 H 1.09000 * 113.61456 * 105.47289 * 16 15 2 36 36 H 1.09003 * 113.61384 * 270.79673 * 17 16 15 37 37 H 1.00903 * 111.00289 * 343.47901 * 18 17 16 38 38 H 1.09007 * 109.46553 * 299.99568 * 19 18 17 39 39 H 1.08993 * 109.47292 * 59.99326 * 19 18 17 40 40 H 1.08997 * 109.47036 * 54.99495 * 20 19 18 41 41 H 1.09002 * 109.47012 * 300.00048 * 21 20 19 42 42 H 1.08991 * 109.47104 * 60.00123 * 21 20 19 43 43 H 1.09002 * 109.47254 * 299.99821 * 22 21 20 44 44 H 1.08997 * 109.47533 * 179.97438 * 22 21 20 45 45 H 1.08998 * 109.47062 * 179.97438 * 23 22 21 46 46 H 1.09002 * 109.46973 * 59.99852 * 23 22 21 47 47 H 1.08997 * 109.47458 * 300.00099 * 24 23 22 48 48 H 1.09004 * 109.47053 * 179.97438 * 24 23 22 49 49 H 1.09006 * 109.47391 * 180.02562 * 25 24 23 50 50 H 1.09002 * 109.47533 * 59.99663 * 25 24 23 51 51 H 1.09003 * 113.61131 * 220.09066 * 26 17 16 52 52 H 1.09003 * 113.61547 * 89.18700 * 26 17 16 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 7 1.4650 0.0000 0.0000 3 6 2.1389 1.1672 0.0000 4 8 3.3517 1.1672 -0.0005 5 6 1.3854 2.4723 0.0006 6 16 2.5616 3.8480 0.0012 7 6 1.4415 5.2082 0.0026 8 1 0.3762 5.0306 0.0024 9 6 1.9283 6.5081 0.0039 10 7 3.2266 6.7247 0.0047 11 14 0.7408 7.9500 0.0047 12 1 -0.1148 7.8861 1.2167 13 1 1.5069 9.2221 0.0055 14 1 -0.1138 7.8882 -1.2083 15 6 2.1975 -1.2687 -0.0006 16 6 1.5590 -2.3482 -0.8904 17 6 1.9075 -3.3558 0.2204 18 7 0.8573 -4.3544 0.4612 19 6 1.2586 -5.6733 -0.0462 20 6 0.1418 -6.6842 0.2217 21 6 -0.0298 -6.8663 1.7312 22 6 -1.1461 -7.8777 1.9992 23 6 -0.7820 -9.2201 1.3616 24 6 -0.6105 -9.0379 -0.1478 25 6 0.5059 -8.0265 -0.4158 26 6 1.8674 -2.1711 1.2001 27 1 -0.3634 0.0001 -1.0277 28 1 -0.3633 0.8900 0.5139 29 1 -0.3633 -0.8901 0.5138 30 1 0.7585 2.5302 -0.8892 31 1 0.7590 2.5298 0.8908 32 1 3.5668 7.6331 0.0060 33 1 3.2666 -1.1401 -0.1692 34 1 0.4874 -2.2146 -1.0382 35 1 2.0975 -2.5207 -1.8223 36 1 2.8970 -3.7999 0.1123 37 1 -0.0193 -4.0623 0.0558 38 1 1.4409 -5.6097 -1.1190 39 1 2.1693 -5.9951 0.4587 40 1 -0.7904 -6.3182 -0.2084 41 1 0.9025 -7.2323 2.1613 42 1 -0.2888 -5.9100 2.1854 43 1 -2.0786 -7.5122 1.5690 44 1 -1.2682 -8.0079 3.0744 45 1 -1.5771 -9.9407 1.5529 46 1 0.1504 -9.5856 1.7918 47 1 -1.5428 -8.6723 -0.5780 48 1 -0.3506 -9.9941 -0.6020 49 1 0.6279 -7.8964 -1.4911 50 1 1.4384 -8.3921 0.0144 51 1 2.6547 -2.2008 1.9534 52 1 0.8803 -1.9890 1.6249 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 ZINC001508096853.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 06:08:59 Heat of formation + Delta-G solvation = -40.230857 kcal Electronic energy + Delta-G solvation = -26779.093938 eV Core-core repulsion = 23097.140009 eV Total energy + Delta-G solvation = -3681.953929 eV No. of doubly occupied orbitals = 63 Molecular weight (most abundant/longest-lived isotopes) = 340.193 amu Computer time = 0.71 seconds Orbital eigenvalues (eV) -40.34042 -39.19300 -38.18332 -35.32500 -33.81946 -32.41961 -31.18146 -30.83518 -29.05617 -26.99551 -25.87000 -25.54301 -25.30036 -23.24020 -22.73780 -21.52458 -20.31503 -19.73541 -18.97807 -17.66631 -16.94086 -16.25020 -15.90579 -15.62734 -15.45329 -15.13802 -14.79920 -14.68823 -14.53409 -14.35587 -14.20511 -13.79136 -13.39378 -13.02952 -12.89466 -12.72276 -12.60462 -12.56646 -12.49972 -12.32562 -12.21359 -12.09975 -11.84500 -11.49575 -11.32883 -11.25579 -11.08066 -11.03413 -11.01847 -10.83764 -10.80115 -10.73707 -10.39476 -10.30596 -9.79920 -9.31961 -9.04982 -8.67296 -8.41944 -8.21701 -6.48991 -6.20438 -3.91119 2.95043 3.05331 3.24011 3.26410 3.29732 3.60031 3.82771 4.21432 4.24572 4.32713 4.38561 4.42947 4.51495 4.66857 4.75677 4.80302 4.89266 4.97669 4.98814 5.09390 5.11584 5.14047 5.14671 5.16005 5.28324 5.29189 5.39202 5.43411 5.44889 5.50755 5.51939 5.56047 5.61266 5.66205 5.69711 5.75804 5.77404 5.82002 5.83701 5.89641 5.92775 5.94944 6.06254 6.11975 6.14118 6.14689 6.71534 6.76745 7.05275 7.57724 7.60448 8.35903 8.58194 9.24573 10.86931 Molecular weight = 340.19amu Principal moments of inertia in cm(-1) A = 0.034800 B = 0.001574 C = 0.001541 Principal moments of inertia in units of 10**(-40)*gram-cm**2 A = 804.400363 B =17787.966279 C =18161.735124 Net atomic charges, atomic populations, and dipole contributions calculated with CM2 Atom NO. Type Charge No. of electrons 1 C 0.079 3.921 2 N -0.612 5.612 3 C 0.533 3.467 4 O -0.517 6.517 5 C -0.150 4.150 6 S -0.062 6.062 7 C -0.536 4.536 8 H 0.072 0.928 9 C 0.074 3.926 10 N -0.868 5.868 11 Si 0.918 3.082 12 H -0.274 1.274 13 H -0.283 1.283 14 H -0.274 1.274 15 C 0.126 3.874 16 C -0.177 4.177 17 C 0.071 3.929 18 N -0.674 5.674 19 C 0.062 3.938 20 C -0.084 4.084 21 C -0.105 4.105 22 C -0.122 4.122 23 C -0.121 4.121 24 C -0.118 4.118 25 C -0.115 4.115 26 C -0.138 4.138 27 H 0.052 0.948 28 H 0.075 0.925 29 H 0.069 0.931 30 H 0.088 0.912 31 H 0.089 0.911 32 H 0.269 0.731 33 H 0.119 0.881 34 H 0.087 0.913 35 H 0.070 0.930 36 H 0.098 0.902 37 H 0.341 0.659 38 H 0.029 0.971 39 H 0.072 0.928 40 H 0.067 0.933 41 H 0.057 0.943 42 H 0.074 0.926 43 H 0.059 0.941 44 H 0.059 0.941 45 H 0.058 0.942 46 H 0.060 0.940 47 H 0.060 0.940 48 H 0.059 0.941 49 H 0.059 0.941 50 H 0.062 0.938 51 H 0.072 0.928 52 H 0.089 0.911 For the charges calculated by CM2: Dipole moment (debyes) X Y Z Total from point charges -9.832 -31.685 0.308 33.177 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 -0.064 4.064 2 N -0.347 5.347 3 C 0.322 3.678 4 O -0.392 6.392 5 C -0.301 4.301 6 S 0.165 5.835 7 C -0.684 4.684 8 H 0.090 0.910 9 C -0.135 4.135 10 N -0.503 5.503 11 Si 0.745 3.255 12 H -0.199 1.199 13 H -0.208 1.208 14 H -0.200 1.200 15 C 0.021 3.979 16 C -0.218 4.218 17 C -0.040 4.040 18 N -0.303 5.303 19 C -0.067 4.067 20 C -0.103 4.103 21 C -0.143 4.143 22 C -0.159 4.159 23 C -0.158 4.158 24 C -0.156 4.156 25 C -0.153 4.153 26 C -0.178 4.178 27 H 0.071 0.929 28 H 0.094 0.906 29 H 0.088 0.912 30 H 0.107 0.893 31 H 0.108 0.892 32 H 0.079 0.921 33 H 0.137 0.863 34 H 0.106 0.894 35 H 0.089 0.911 36 H 0.116 0.884 37 H 0.160 0.840 38 H 0.047 0.953 39 H 0.090 0.910 40 H 0.086 0.914 41 H 0.076 0.924 42 H 0.093 0.907 43 H 0.078 0.922 44 H 0.078 0.922 45 H 0.076 0.924 46 H 0.079 0.921 47 H 0.079 0.921 48 H 0.078 0.922 49 H 0.078 0.922 50 H 0.081 0.919 51 H 0.091 0.909 52 H 0.107 0.893 Dipole moment (debyes) X Y Z Total from point charges -7.680 -31.675 0.954 32.606 hybrid contribution -2.379 1.064 -1.031 2.803 sum -10.059 -30.610 -0.077 32.221 Atomic orbital electron populations 1.21721 0.79954 1.03148 1.01574 1.47776 1.06537 1.05282 1.75105 1.20370 0.87953 0.84623 0.74897 1.90682 1.13791 1.86826 1.47864 1.23564 1.04535 0.97280 1.04675 1.85393 1.08100 0.93340 1.96705 1.22822 0.94277 0.92243 1.59068 0.91009 1.24984 0.95663 0.98346 0.94531 1.70008 1.11750 1.21745 1.46772 0.86229 0.80196 0.80318 0.78785 1.19937 1.20804 1.19961 1.22329 0.98103 0.81415 0.96036 1.24180 1.01800 0.97050 0.98734 1.22850 0.95591 0.90351 0.95245 1.60427 1.05222 1.01901 1.62777 1.22064 0.98402 0.88977 0.97304 1.21163 0.98188 0.94274 0.96673 1.21476 0.98330 0.99437 0.95056 1.21570 0.98879 0.95295 1.00197 1.21547 1.01334 0.97390 0.95538 1.21509 0.98886 0.98879 0.96303 1.21558 0.98708 0.94828 1.00173 1.23538 1.02930 0.93966 0.97338 0.92894 0.90590 0.91245 0.89328 0.89248 0.92139 0.86328 0.89418 0.91129 0.88414 0.84038 0.95256 0.90999 0.91450 0.92386 0.90715 0.92239 0.92214 0.92371 0.92125 0.92119 0.92206 0.92203 0.91908 0.90876 0.89299 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 0.08 0.84 8.84 59.85 0.53 1.37 16 2 N -0.61 -8.70 3.08 -173.00 -0.53 -9.24 16 3 C 0.53 10.32 7.69 -10.98 -0.08 10.24 16 4 O -0.52 -11.99 15.33 5.56 0.09 -11.91 16 5 C -0.15 -3.09 4.71 36.00 0.17 -2.92 16 6 S -0.06 -1.71 20.57 -107.50 -2.21 -3.92 16 7 C -0.54 -15.35 9.50 30.94 0.29 -15.06 16 8 H 0.07 1.94 7.80 -52.49 -0.41 1.53 16 9 C 0.07 2.12 5.49 -17.43 -0.10 2.03 16 10 N -0.87 -26.28 13.22 55.49 0.73 -25.54 16 11 Si 0.92 21.45 29.55 -169.99 -5.02 16.42 16 12 H -0.27 -6.24 7.11 56.52 0.40 -5.83 16 13 H -0.28 -6.48 7.11 56.52 0.40 -6.08 16 14 H -0.27 -6.24 7.11 56.52 0.40 -5.84 16 15 C 0.13 1.53 4.21 -67.12 -0.28 1.25 16 16 C -0.18 -1.59 7.16 -25.82 -0.18 -1.77 16 17 C 0.07 0.58 4.18 -66.81 -0.28 0.30 16 18 N -0.67 -4.78 6.07 -105.77 -0.64 -5.42 16 19 C 0.06 0.40 4.92 -3.83 -0.02 0.38 16 20 C -0.08 -0.49 2.33 -90.62 -0.21 -0.70 16 21 C -0.11 -0.67 5.09 -26.73 -0.14 -0.80 16 22 C -0.12 -0.70 5.92 -26.73 -0.16 -0.86 16 23 C -0.12 -0.64 5.92 -26.73 -0.16 -0.80 16 24 C -0.12 -0.61 5.92 -26.73 -0.16 -0.77 16 25 C -0.11 -0.62 5.20 -26.73 -0.14 -0.76 16 26 C -0.14 -1.39 7.41 -25.92 -0.19 -1.58 16 27 H 0.05 0.51 8.14 -51.93 -0.42 0.08 16 28 H 0.08 0.82 6.44 -51.93 -0.33 0.49 16 29 H 0.07 0.57 6.33 -51.93 -0.33 0.24 16 30 H 0.09 1.70 8.11 -51.91 -0.42 1.28 16 31 H 0.09 1.71 7.40 -51.91 -0.38 1.32 16 32 H 0.27 7.58 8.31 -40.82 -0.34 7.24 16 33 H 0.12 1.69 7.21 -51.93 -0.37 1.31 16 34 H 0.09 0.71 6.50 -51.93 -0.34 0.37 16 35 H 0.07 0.64 8.14 -51.93 -0.42 0.22 16 36 H 0.10 0.80 7.87 -51.93 -0.41 0.39 16 37 H 0.34 2.21 8.20 -39.29 -0.32 1.89 16 38 H 0.03 0.19 8.14 -51.92 -0.42 -0.23 16 39 H 0.07 0.50 8.13 -51.93 -0.42 0.08 16 40 H 0.07 0.41 8.14 -51.93 -0.42 -0.01 16 41 H 0.06 0.40 8.14 -51.93 -0.42 -0.02 16 42 H 0.07 0.55 7.75 -51.93 -0.40 0.15 16 43 H 0.06 0.35 8.14 -51.93 -0.42 -0.07 16 44 H 0.06 0.34 8.14 -51.93 -0.42 -0.08 16 45 H 0.06 0.29 8.14 -51.93 -0.42 -0.14 16 46 H 0.06 0.33 8.14 -51.93 -0.42 -0.09 16 47 H 0.06 0.32 8.14 -51.93 -0.42 -0.10 16 48 H 0.06 0.28 8.14 -51.93 -0.42 -0.14 16 49 H 0.06 0.31 8.14 -51.93 -0.42 -0.11 16 50 H 0.06 0.35 8.14 -51.93 -0.42 -0.07 16 51 H 0.07 0.78 8.14 -51.93 -0.42 0.36 16 52 H 0.09 0.88 6.82 -51.93 -0.35 0.53 16 LS Contribution 414.54 15.07 6.25 6.25 Total: -1.00 -33.18 414.54 -12.01 -45.19 By element: Atomic # 1 Polarization: 8.20 SS G_CDS: -9.55 Total: -1.35 kcal Atomic # 6 Polarization: -9.37 SS G_CDS: -1.11 Total: -10.48 kcal Atomic # 7 Polarization: -39.76 SS G_CDS: -0.44 Total: -40.20 kcal Atomic # 8 Polarization: -11.99 SS G_CDS: 0.09 Total: -11.91 kcal Atomic # 14 Polarization: 21.45 SS G_CDS: -5.02 Total: 16.42 kcal Atomic # 16 Polarization: -1.71 SS G_CDS: -2.21 Total: -3.92 kcal Total LS contribution 6.25 Total: 6.25 kcal Total: -33.18 -12.01 -45.19 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. ZINC001508096853.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 4.956 kcal (2) G-P(sol) polarization free energy of solvation -33.181 kcal (3) G-ENP(sol) elect.-nuc.-pol. free energy of system -28.225 kcal (4) G-CDS(sol) cavity-dispersion-solvent structure free energy -12.006 kcal (5) G-P-CDS(sol) = G-P(sol) + G-CDS(sol) = (2) + (4) -45.187 kcal (6) G-S(sol) free energy of system = (1) + (5) -40.231 kcal 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED Total computer time = 0.71 seconds