Wall clock time and date at job start Tue Mar 31 2020 19:56:36 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 1.53000 * 1 3 3 C 1.50699 * 109.47388 * 2 1 4 4 C 1.50703 * 119.99729 * 275.00045 * 3 2 1 5 5 C 1.32988 * 120.00271 * 94.99985 * 3 2 1 6 6 C 1.47105 * 120.00174 * 172.12276 * 5 3 2 7 7 O 1.21619 * 119.99859 * 353.29791 * 6 5 3 8 8 N 1.34781 * 119.99790 * 173.29441 * 6 5 3 9 9 C 1.46932 * 120.57895 * 174.41844 * 8 6 5 10 10 C 1.53290 * 108.71447 * 125.84705 * 9 8 6 11 11 C 1.52430 * 109.41486 * 53.71685 * 10 9 8 12 12 C 1.53608 * 110.44272 * 62.95723 * 11 10 9 13 13 O 1.43887 * 107.11435 * 120.51057 * 12 11 10 14 14 C 1.44430 * 106.99906 * 333.63136 * 13 12 11 15 15 H 1.08994 * 110.60746 * 281.23023 * 14 13 12 16 16 C 1.52997 * 110.60454 * 158.25612 * 14 13 12 17 17 N 1.46504 * 109.47072 * 66.45987 * 16 14 13 18 18 C 1.36932 * 120.00204 * 179.97438 * 17 16 14 19 19 H 1.07998 * 119.99853 * 359.97438 * 18 17 16 20 20 C 1.38815 * 120.00091 * 179.97438 * 18 17 16 21 21 N 1.31618 * 119.99733 * 359.97438 * 20 18 17 22 22 Si 1.86796 * 120.00035 * 179.97438 * 20 18 17 23 23 H 1.48501 * 109.47070 * 59.99997 * 22 20 18 24 24 H 1.48495 * 109.47108 * 179.97438 * 22 20 18 25 25 H 1.48505 * 109.47436 * 300.00158 * 22 20 18 26 26 C 1.54320 * 110.04816 * 178.04029 * 11 10 9 27 27 C 1.52425 * 110.97791 * 300.11645 * 11 10 9 28 28 C 1.46930 * 120.58825 * 354.44192 * 8 6 5 29 29 H 1.08998 * 109.46884 * 300.00320 * 1 2 3 30 30 H 1.09003 * 109.46985 * 59.99808 * 1 2 3 31 31 H 1.08993 * 109.47283 * 180.02562 * 1 2 3 32 32 H 1.08999 * 109.47190 * 240.00122 * 2 1 3 33 33 H 1.08999 * 109.47405 * 119.99959 * 2 1 3 34 34 H 1.08998 * 109.46993 * 263.67456 * 4 3 2 35 35 H 1.08994 * 109.47463 * 23.67932 * 4 3 2 36 36 H 1.09006 * 109.47273 * 143.67639 * 4 3 2 37 37 H 1.07999 * 120.00109 * 352.12056 * 5 3 2 38 38 H 1.08997 * 109.59999 * 6.07959 * 9 8 6 39 39 H 1.09001 * 109.59739 * 245.61426 * 9 8 6 40 40 H 1.09000 * 109.48373 * 293.73033 * 10 9 8 41 41 H 1.08999 * 109.49304 * 173.70063 * 10 9 8 42 42 H 1.08997 * 109.90371 * 1.13981 * 12 11 10 43 43 H 1.09005 * 110.06238 * 239.96764 * 12 11 10 44 44 H 1.09003 * 109.46915 * 186.45253 * 16 14 13 45 45 H 1.08992 * 109.47381 * 306.45593 * 16 14 13 46 46 H 0.97000 * 119.99717 * 359.97438 * 17 16 14 47 47 H 0.96997 * 119.99684 * 180.02562 * 21 20 18 48 48 H 1.08999 * 110.92861 * 20.11514 * 26 11 10 49 49 H 1.08996 * 110.93046 * 143.77582 * 26 11 10 50 50 H 1.09004 * 109.47653 * 179.85523 * 27 11 10 51 51 H 1.08998 * 109.48109 * 299.88463 * 27 11 10 52 52 H 1.09002 * 109.59188 * 353.91458 * 28 8 6 53 53 H 1.08999 * 109.59426 * 114.37151 * 28 8 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 2.0324 1.4208 0.0000 4 6 2.1763 2.1691 -1.3002 5 6 2.3487 2.0143 1.1473 6 6 3.0001 3.3332 1.1380 7 8 3.3597 3.8264 0.0861 8 7 3.1984 3.9950 2.2953 9 6 3.9549 5.2544 2.3161 10 6 3.0982 6.3318 2.9906 11 6 2.6407 5.8337 4.3567 12 6 3.8500 5.5966 5.2738 13 8 3.6830 6.4465 6.4228 14 6 2.8759 7.5687 6.0042 15 1 3.4801 8.2934 5.4585 16 6 2.2017 8.2265 7.2098 17 7 3.2213 8.8362 8.0671 18 6 2.8518 9.4878 9.2133 19 1 1.8086 9.5528 9.4852 20 6 3.8179 10.0650 10.0259 21 7 5.0893 9.9855 9.6949 22 14 3.3137 10.9546 11.5891 23 1 2.6052 10.0100 12.4897 24 1 4.5236 11.4771 12.2736 25 1 2.4114 12.0835 11.2473 26 6 1.8173 6.9268 5.0698 27 6 1.8147 4.5595 4.2244 28 6 2.6622 3.4696 3.5584 29 1 -0.3633 0.5139 0.8899 30 1 -0.3633 0.5139 -0.8900 31 1 -0.3633 -1.0276 0.0005 32 1 1.8933 -0.5138 -0.8900 33 1 1.8934 -0.5138 0.8900 34 1 3.2077 2.1010 -1.6463 35 1 1.5130 1.7318 -2.0464 36 1 1.9124 3.2157 -1.1482 37 1 2.1273 1.5280 2.0859 38 1 4.1874 5.5581 1.2954 39 1 4.8786 5.1168 2.8783 40 1 2.2272 6.5444 2.3708 41 1 3.6873 7.2406 3.1138 42 1 4.7697 5.8570 4.7500 43 1 3.8836 4.5528 5.5860 44 1 1.5102 8.9953 6.8648 45 1 1.6542 7.4730 7.7759 46 1 4.1583 8.7782 7.8228 47 1 5.7645 10.3885 10.2629 48 1 1.4360 7.6557 4.3547 49 1 1.0039 6.4872 5.6469 50 1 1.5032 4.2240 5.2136 51 1 0.9340 4.7590 3.6139 52 1 2.0419 2.5962 3.3569 53 1 3.4848 3.1923 4.2175 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 ZINC001717634493.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 19:56:36 Heat of formation + Delta-G solvation = -59.982060 kcal Electronic energy + Delta-G solvation = -29695.221003 eV Core-core repulsion = 25760.113778 eV Total energy + Delta-G solvation = -3935.107224 eV No. of doubly occupied orbitals = 65 Molecular weight (most abundant/longest-lived isotopes) = 336.220 amu Computer time = 0.86 seconds Orbital eigenvalues (eV) -40.99141 -39.65092 -37.27952 -36.27340 -34.47991 -33.47055 -31.89022 -31.60601 -31.05112 -29.64078 -28.23046 -26.93364 -25.29737 -24.73501 -23.90786 -23.41913 -22.29772 -20.80873 -20.70965 -19.03569 -18.06000 -17.59974 -17.04225 -16.09332 -16.06674 -15.65174 -15.34645 -15.16773 -14.84781 -14.72914 -14.56376 -14.24120 -13.94656 -13.65541 -13.58373 -13.28416 -13.10921 -13.02070 -12.96737 -12.75645 -12.59915 -12.47718 -12.04877 -11.99744 -11.84138 -11.75428 -11.54095 -11.38403 -11.35350 -11.16649 -10.98405 -10.76651 -10.50096 -10.43676 -10.39580 -9.98428 -9.76055 -9.61487 -9.49124 -9.26162 -8.82723 -8.75642 -6.84950 -5.69109 -2.97689 1.04267 2.77111 3.02478 3.48065 3.51800 3.53399 4.10710 4.13316 4.33040 4.35858 4.43386 4.55103 4.64706 4.72923 4.77461 4.80230 4.84439 4.93112 5.03525 5.06654 5.09644 5.23653 5.25954 5.28428 5.35167 5.40795 5.42832 5.45878 5.50255 5.51883 5.57384 5.62976 5.70377 5.71772 5.75148 5.77920 5.82199 5.90476 5.96048 6.05164 6.10620 6.13174 6.17716 6.19809 6.36093 6.36949 6.60771 6.79236 7.19847 7.34526 7.74014 7.99087 8.49226 9.60415 10.19114 10.54763 11.53644 Molecular weight = 336.22amu Principal moments of inertia in cm(-1) A = 0.032796 B = 0.001901 C = 0.001859 Principal moments of inertia in units of 10**(-40)*gram-cm**2 A = 853.569134 B =14728.991935 C =15060.972815 Net atomic charges, atomic populations, and dipole contributions calculated with CM2 Atom NO. Type Charge No. of electrons 1 C -0.148 4.148 2 C -0.098 4.098 3 C -0.026 4.026 4 C -0.122 4.122 5 C -0.237 4.237 6 C 0.548 3.452 7 O -0.544 6.544 8 N -0.607 5.607 9 C 0.110 3.890 10 C -0.119 4.119 11 C -0.091 4.091 12 C 0.053 3.947 13 O -0.357 6.357 14 C 0.074 3.926 15 H 0.068 0.932 16 C 0.160 3.840 17 N -0.728 5.728 18 C -0.240 4.240 19 H 0.069 0.931 20 C -0.014 4.014 21 N -0.932 5.932 22 Si 0.908 3.092 23 H -0.286 1.286 24 H -0.291 1.291 25 H -0.286 1.286 26 C -0.138 4.138 27 C -0.118 4.118 28 C 0.103 3.897 29 H 0.058 0.942 30 H 0.058 0.942 31 H 0.061 0.939 32 H 0.079 0.921 33 H 0.075 0.925 34 H 0.079 0.921 35 H 0.054 0.946 36 H 0.086 0.914 37 H 0.128 0.872 38 H 0.094 0.906 39 H 0.070 0.930 40 H 0.070 0.930 41 H 0.080 0.920 42 H 0.055 0.945 43 H 0.079 0.921 44 H 0.030 0.970 45 H 0.025 0.975 46 H 0.387 0.613 47 H 0.255 0.745 48 H 0.078 0.922 49 H 0.080 0.920 50 H 0.082 0.918 51 H 0.070 0.930 52 H 0.088 0.912 53 H 0.072 0.928 For the charges calculated by CM2: Dipole moment (debyes) X Y Z Total from point charges -8.228 -20.805 -22.120 31.462 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 -0.205 4.205 2 C -0.135 4.135 3 C -0.028 4.028 4 C -0.178 4.178 5 C -0.258 4.258 6 C 0.340 3.660 7 O -0.424 6.424 8 N -0.340 5.340 9 C -0.013 4.013 10 C -0.157 4.157 11 C -0.092 4.092 12 C -0.024 4.024 13 O -0.275 6.275 14 C 0.016 3.984 15 H 0.086 0.914 16 C 0.033 3.967 17 N -0.372 5.372 18 C -0.371 4.371 19 H 0.087 0.913 20 C -0.210 4.210 21 N -0.580 5.580 22 Si 0.739 3.261 23 H -0.213 1.213 24 H -0.217 1.217 25 H -0.213 1.213 26 C -0.176 4.176 27 C -0.156 4.156 28 C -0.019 4.019 29 H 0.077 0.923 30 H 0.077 0.923 31 H 0.080 0.920 32 H 0.097 0.903 33 H 0.094 0.906 34 H 0.098 0.902 35 H 0.073 0.927 36 H 0.105 0.895 37 H 0.146 0.854 38 H 0.112 0.888 39 H 0.088 0.912 40 H 0.088 0.912 41 H 0.098 0.902 42 H 0.073 0.927 43 H 0.097 0.903 44 H 0.048 0.952 45 H 0.043 0.957 46 H 0.221 0.779 47 H 0.065 0.935 48 H 0.097 0.903 49 H 0.098 0.902 50 H 0.101 0.899 51 H 0.088 0.912 52 H 0.106 0.894 53 H 0.090 0.910 Dipole moment (debyes) X Y Z Total from point charges -8.031 -20.493 -22.308 31.338 hybrid contribution 0.005 0.484 0.851 0.979 sum -8.025 -20.009 -21.457 30.416 Atomic orbital electron populations 1.21726 0.94123 1.02158 1.02498 1.20785 0.96753 0.92577 1.03420 1.22583 0.90016 0.94734 0.95469 1.21109 1.02388 1.01007 0.93330 1.22457 1.07616 0.96802 0.98887 1.18549 0.79184 0.85251 0.83003 1.90751 1.52278 1.69263 1.30158 1.47973 1.54711 1.23979 1.07375 1.21666 0.93949 0.83009 1.02633 1.21897 1.00534 0.98267 0.95024 1.21494 0.96246 0.95794 0.95650 1.23248 0.96131 0.95686 0.87352 1.89096 1.72466 1.34700 1.31288 1.23434 0.90574 0.88699 0.95707 0.91432 1.20696 0.92176 0.94340 0.89519 1.42272 1.05037 1.65141 1.24796 1.19185 0.92627 1.26634 0.98681 0.91295 1.24748 0.95289 1.01737 0.99270 1.69668 0.99149 1.49936 1.39283 0.86258 0.76954 0.79529 0.83374 1.21316 1.21703 1.21320 1.23191 0.98637 0.97235 0.98520 1.21875 0.98111 0.94154 1.01497 1.21914 0.98059 0.96939 0.85013 0.92326 0.92311 0.92036 0.90277 0.90633 0.90247 0.92711 0.89506 0.85418 0.88791 0.91205 0.91175 0.90166 0.92675 0.90324 0.95221 0.95695 0.77900 0.93524 0.90315 0.90173 0.89930 0.91158 0.89362 0.90952 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 -0.66 9.89 37.16 0.37 -0.30 16 2 C -0.10 -0.50 6.08 -27.88 -0.17 -0.67 16 3 C -0.03 -0.20 5.36 -101.17 -0.54 -0.74 16 4 C -0.12 -1.01 8.45 36.01 0.30 -0.71 16 5 C -0.24 -1.95 8.80 -37.81 -0.33 -2.28 16 6 C 0.55 5.95 7.47 -12.66 -0.09 5.85 16 7 O -0.54 -7.39 12.74 5.26 0.07 -7.33 16 8 N -0.61 -5.87 2.96 -174.03 -0.52 -6.38 16 9 C 0.11 1.10 6.14 -3.66 -0.02 1.07 16 10 C -0.12 -1.19 4.59 -26.87 -0.12 -1.31 16 11 C -0.09 -0.97 0.61 -154.09 -0.09 -1.07 16 12 C 0.05 0.69 6.15 37.47 0.23 0.92 16 13 O -0.36 -6.50 11.22 -35.23 -0.40 -6.90 16 14 C 0.07 1.25 3.38 -25.62 -0.09 1.16 16 15 H 0.07 1.17 8.14 -51.93 -0.42 0.75 16 16 C 0.16 3.35 6.00 -4.04 -0.02 3.33 16 17 N -0.73 -19.43 5.59 -59.91 -0.33 -19.77 16 18 C -0.24 -6.96 9.99 -15.06 -0.15 -7.11 16 19 H 0.07 1.92 7.83 -52.49 -0.41 1.51 16 20 C -0.01 -0.43 5.50 -17.43 -0.10 -0.52 16 21 N -0.93 -29.10 13.06 55.49 0.72 -28.38 16 22 Si 0.91 22.90 29.55 -169.99 -5.02 17.87 16 23 H -0.29 -7.10 7.11 56.52 0.40 -6.70 16 24 H -0.29 -7.37 7.11 56.52 0.40 -6.97 16 25 H -0.29 -7.06 7.11 56.52 0.40 -6.66 16 26 C -0.14 -1.71 5.67 -24.92 -0.14 -1.85 16 27 C -0.12 -1.02 4.63 -26.88 -0.12 -1.14 16 28 C 0.10 0.79 6.00 -3.66 -0.02 0.77 16 29 H 0.06 0.28 8.14 -51.93 -0.42 -0.14 16 30 H 0.06 0.27 8.14 -51.93 -0.42 -0.15 16 31 H 0.06 0.22 8.14 -51.93 -0.42 -0.21 16 32 H 0.08 0.35 8.14 -51.93 -0.42 -0.08 16 33 H 0.08 0.33 8.04 -51.93 -0.42 -0.08 16 34 H 0.08 0.72 7.98 -51.93 -0.41 0.31 16 35 H 0.05 0.35 8.09 -51.93 -0.42 -0.07 16 36 H 0.09 0.90 6.27 -51.93 -0.33 0.58 16 37 H 0.13 0.78 6.09 -52.49 -0.32 0.46 16 38 H 0.09 1.03 6.99 -51.93 -0.36 0.67 16 39 H 0.07 0.67 6.90 -51.93 -0.36 0.31 16 40 H 0.07 0.70 8.14 -51.93 -0.42 0.28 16 41 H 0.08 0.82 8.14 -51.93 -0.42 0.40 16 42 H 0.06 0.69 6.61 -51.93 -0.34 0.35 16 43 H 0.08 0.91 6.45 -51.93 -0.34 0.57 16 44 H 0.03 0.60 8.14 -51.93 -0.42 0.18 16 45 H 0.03 0.54 8.14 -51.93 -0.42 0.11 16 46 H 0.39 11.01 7.67 -40.82 -0.31 10.70 16 47 H 0.25 7.68 8.31 -40.82 -0.34 7.34 16 48 H 0.08 0.88 7.83 -51.93 -0.41 0.48 16 49 H 0.08 0.98 7.75 -51.93 -0.40 0.57 16 50 H 0.08 0.70 8.14 -51.93 -0.42 0.27 16 51 H 0.07 0.60 8.14 -51.93 -0.42 0.17 16 52 H 0.09 0.52 5.44 -51.93 -0.28 0.24 16 53 H 0.07 0.54 6.80 -51.93 -0.35 0.18 16 LS Contribution 405.76 15.07 6.11 6.11 Total: -1.00 -34.24 405.76 -9.74 -43.98 By element: Atomic # 1 Polarization: 14.62 SS G_CDS: -9.25 Total: 5.37 kcal Atomic # 6 Polarization: -3.47 SS G_CDS: -1.12 Total: -4.59 kcal Atomic # 7 Polarization: -54.40 SS G_CDS: -0.13 Total: -54.53 kcal Atomic # 8 Polarization: -13.89 SS G_CDS: -0.33 Total: -14.22 kcal Atomic # 14 Polarization: 22.90 SS G_CDS: -5.02 Total: 17.87 kcal Total LS contribution 6.11 Total: 6.11 kcal Total: -34.24 -9.74 -43.98 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. ZINC001717634493.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 -16.002 kcal (2) G-P(sol) polarization free energy of solvation -34.245 kcal (3) G-ENP(sol) elect.-nuc.-pol. free energy of system -50.247 kcal (4) G-CDS(sol) cavity-dispersion-solvent structure free energy -9.735 kcal (5) G-P-CDS(sol) = G-P(sol) + G-CDS(sol) = (2) + (4) -43.980 kcal (6) G-S(sol) free energy of system = (1) + (5) -59.982 kcal 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED Total computer time = 0.86 seconds