Wall clock time and date at job start Wed Apr 1 2020 01:53:55 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 1.50697 * 1 3 3 C 1.38256 * 119.99843 * 2 1 4 4 C 1.38212 * 119.99748 * 180.23363 * 3 2 1 5 5 C 1.38259 * 120.00166 * 359.80464 * 4 3 2 6 6 C 1.38207 * 119.99668 * 359.97438 * 5 4 3 7 7 C 1.38209 * 120.00262 * 179.78520 * 2 1 3 8 8 C 1.50710 * 119.99951 * 359.97438 * 7 2 1 9 9 C 1.50703 * 109.46897 * 84.72388 * 8 7 2 10 10 O 1.21275 * 120.00111 * 0.02562 * 9 8 7 11 11 N 1.34778 * 119.99612 * 180.02562 * 9 8 7 12 12 C 1.46928 * 120.55057 * 179.97438 * 11 9 8 13 13 C 1.53342 * 108.68473 * 125.63017 * 12 11 9 14 14 C 1.52110 * 109.44249 * 53.30481 * 13 12 11 15 15 C 1.54385 * 110.50739 * 64.08966 * 14 13 12 16 16 C 1.54457 * 102.87109 * 83.33374 * 15 14 13 17 17 N 1.47083 * 107.29725 * 21.50085 * 16 15 14 18 18 C 1.36935 * 125.62931 * 180.96847 * 17 16 15 19 19 H 1.08003 * 119.99937 * 168.95343 * 18 17 16 20 20 C 1.38811 * 119.99964 * 348.94815 * 18 17 16 21 21 N 1.31619 * 119.99929 * 165.65470 * 20 18 17 22 22 Si 1.86799 * 120.00069 * 345.65523 * 20 18 17 23 23 H 1.48500 * 109.47088 * 185.28736 * 22 20 18 24 24 H 1.48495 * 109.46844 * 305.28614 * 22 20 18 25 25 H 1.48497 * 109.46908 * 65.28631 * 22 20 18 26 26 C 1.47575 * 108.74515 * 1.23423 * 17 16 15 27 27 C 1.52103 * 111.59976 * 300.69054 * 14 13 12 28 28 C 1.46928 * 120.55101 * 359.97438 * 11 9 8 29 29 H 1.09006 * 109.47106 * 270.21070 * 1 2 3 30 30 H 1.08997 * 109.47625 * 30.21094 * 1 2 3 31 31 H 1.08996 * 109.47208 * 150.21574 * 1 2 3 32 32 H 1.07999 * 120.00130 * 0.05980 * 3 2 1 33 33 H 1.08005 * 119.99908 * 179.83124 * 4 3 2 34 34 H 1.08004 * 120.00168 * 180.02562 * 5 4 3 35 35 H 1.08004 * 119.99769 * 180.02562 * 6 5 4 36 36 H 1.09003 * 109.46609 * 324.72484 * 8 7 2 37 37 H 1.08995 * 109.46867 * 204.72588 * 8 7 2 38 38 H 1.08999 * 109.60337 * 5.87416 * 12 11 9 39 39 H 1.09002 * 109.60479 * 245.38772 * 12 11 9 40 40 H 1.08999 * 109.47461 * 293.31423 * 13 12 11 41 41 H 1.08999 * 109.48299 * 173.29949 * 13 12 11 42 42 H 1.08995 * 110.73888 * 324.98680 * 15 14 13 43 43 H 1.09004 * 110.73381 * 201.67143 * 15 14 13 44 44 H 1.09003 * 109.87682 * 262.08138 * 16 15 14 45 45 H 1.09002 * 109.88538 * 140.92812 * 16 15 14 46 46 H 0.97002 * 120.00420 * 354.93210 * 21 20 18 47 47 H 1.09003 * 110.37719 * 95.25320 * 26 17 16 48 48 H 1.08995 * 110.38134 * 217.60924 * 26 17 16 49 49 H 1.08994 * 109.47603 * 179.28981 * 27 14 13 50 50 H 1.09001 * 109.48068 * 299.31611 * 27 14 13 51 51 H 1.08992 * 109.60702 * 354.12479 * 28 11 9 52 52 H 1.08995 * 109.60156 * 114.60997 * 28 11 9 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 2.1982 1.1974 0.0000 4 6 3.5803 1.1973 -0.0049 5 6 4.2716 0.0000 -0.0057 6 6 3.5806 -1.1969 -0.0011 7 6 2.1981 -1.1969 0.0045 8 6 1.4446 -2.5021 0.0100 9 6 1.0797 -2.8774 -1.4033 10 8 1.4004 -2.1564 -2.3242 11 7 0.3971 -4.0144 -1.6436 12 6 0.0346 -4.3918 -3.0166 13 6 0.5568 -5.8071 -3.2911 14 6 0.0599 -6.7496 -2.2055 15 6 -1.4795 -6.8590 -2.2473 16 6 -1.7192 -7.9229 -3.3411 17 7 -0.4804 -8.7053 -3.4692 18 6 -0.2751 -9.7361 -4.3469 19 1 0.7192 -10.1320 -4.4918 20 6 -1.3450 -10.2722 -5.0503 21 7 -1.1259 -11.0541 -6.0862 22 14 -3.0956 -9.8840 -4.5268 23 1 -4.0454 -10.6731 -5.3517 24 1 -3.2734 -10.2351 -3.0950 25 1 -3.3595 -8.4352 -4.7177 26 6 0.5026 -8.2004 -2.4911 27 6 0.5257 -6.3098 -0.8259 28 6 0.0030 -4.8970 -0.5371 29 1 -0.3634 0.0038 1.0277 30 1 -0.3634 0.8880 -0.5171 31 1 -0.3633 -0.8919 -0.5105 32 1 1.6582 2.1326 0.0010 33 1 4.1203 2.1327 -0.0076 34 1 5.3517 0.0000 -0.0091 35 1 4.1206 -2.1322 -0.0013 36 1 0.5366 -2.3948 0.6034 37 1 2.0715 -3.2817 0.4427 38 1 0.4870 -3.6924 -3.7196 39 1 -1.0497 -4.3744 -3.1264 40 1 1.6468 -5.7982 -3.2936 41 1 0.1940 -6.1467 -4.2612 42 1 -1.9266 -5.9063 -2.5311 43 1 -1.8685 -7.1984 -1.2873 44 1 -1.9490 -7.4351 -4.2885 45 1 -2.5416 -8.5760 -3.0492 46 1 -0.2204 -11.1969 -6.4033 47 1 0.4707 -8.7961 -1.5788 48 1 1.5050 -8.2135 -2.9191 49 1 0.1408 -7.0000 -0.0753 50 1 1.6152 -6.3080 -0.7936 51 1 0.4345 -4.5308 0.3943 52 1 -1.0837 -4.9186 -0.4558 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 ZINC001035253436.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 01:53:55 Heat of formation + Delta-G solvation = 17.861884 kcal Electronic energy + Delta-G solvation = -30564.750007 eV Core-core repulsion = 26722.559739 eV Total energy + Delta-G solvation = -3842.190268 eV No. of doubly occupied orbitals = 65 Molecular weight (most abundant/longest-lived isotopes) = 342.205 amu Computer time = 3.06 seconds Orbital eigenvalues (eV) -40.79777 -39.73292 -38.54717 -36.03634 -33.68200 -33.16943 -32.47847 -31.31626 -31.18969 -29.08263 -28.41752 -27.22879 -26.61050 -23.79676 -23.43279 -22.93655 -22.28671 -21.26799 -20.48489 -19.69328 -18.23512 -17.45068 -16.99006 -16.66675 -16.19465 -15.85516 -15.41711 -15.26443 -15.14582 -14.84687 -14.12840 -13.99169 -13.75900 -13.56625 -13.48636 -13.38565 -13.26204 -13.06347 -12.99398 -12.59273 -12.51412 -12.29087 -12.20703 -12.19573 -11.81709 -11.46133 -11.29936 -11.21705 -11.18205 -11.12819 -10.95943 -10.45539 -10.36411 -10.24494 -9.99266 -9.82746 -9.30818 -8.98967 -8.94955 -8.77057 -8.70842 -8.62325 -7.01121 -6.29739 -3.20947 1.11904 1.20264 2.53203 2.89854 3.41658 3.49038 3.56416 3.71596 4.35702 4.46837 4.53519 4.62386 4.65637 4.72274 4.73859 4.78951 4.91912 4.96181 5.00733 5.06660 5.13142 5.15375 5.24172 5.30348 5.31574 5.37173 5.38505 5.47690 5.51979 5.57182 5.62669 5.68693 5.76506 5.78725 5.84331 5.91021 5.93424 5.96153 6.03942 6.24192 6.25777 6.30204 6.31403 6.33688 6.40186 6.41850 6.53564 6.64674 6.76380 6.77871 6.80560 7.31991 7.69016 8.09586 8.34846 9.05684 9.57501 10.24931 11.20936 Molecular weight = 342.20amu Principal moments of inertia in cm(-1) A = 0.028141 B = 0.002326 C = 0.002278 Principal moments of inertia in units of 10**(-40)*gram-cm**2 A = 994.765152 B =12036.614327 C =12286.334870 Net atomic charges, atomic populations, and dipole contributions calculated with CM2 Atom NO. Type Charge No. of electrons 1 C -0.117 4.117 2 C -0.069 4.069 3 C -0.121 4.121 4 C -0.118 4.118 5 C -0.126 4.126 6 C -0.103 4.103 7 C -0.065 4.065 8 C -0.104 4.104 9 C 0.515 3.485 10 O -0.534 6.534 11 N -0.609 5.609 12 C 0.111 3.889 13 C -0.111 4.111 14 C -0.071 4.071 15 C -0.123 4.123 16 C 0.112 3.888 17 N -0.612 5.612 18 C -0.319 4.319 19 H 0.077 0.923 20 C -0.023 4.023 21 N -0.930 5.930 22 Si 1.073 2.927 23 H -0.303 1.303 24 H -0.300 1.300 25 H -0.287 1.287 26 C 0.147 3.853 27 C -0.118 4.118 28 C 0.107 3.893 29 H 0.070 0.930 30 H 0.067 0.933 31 H 0.065 0.935 32 H 0.120 0.880 33 H 0.120 0.880 34 H 0.120 0.880 35 H 0.120 0.880 36 H 0.102 0.898 37 H 0.101 0.899 38 H 0.090 0.910 39 H 0.069 0.931 40 H 0.062 0.938 41 H 0.086 0.914 42 H 0.068 0.932 43 H 0.066 0.934 44 H 0.044 0.956 45 H 0.026 0.974 46 H 0.261 0.739 47 H 0.023 0.977 48 H 0.042 0.958 49 H 0.078 0.922 50 H 0.066 0.934 51 H 0.082 0.918 52 H 0.073 0.927 For the charges calculated by CM2: Dipole moment (debyes) X Y Z Total from point charges 4.949 22.913 17.967 29.535 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 -0.173 4.173 2 C -0.069 4.069 3 C -0.139 4.139 4 C -0.136 4.136 5 C -0.144 4.144 6 C -0.121 4.121 7 C -0.066 4.066 8 C -0.143 4.143 9 C 0.303 3.697 10 O -0.410 6.410 11 N -0.343 5.343 12 C -0.010 4.010 13 C -0.149 4.149 14 C -0.072 4.072 15 C -0.160 4.160 16 C -0.013 4.013 17 N -0.339 5.339 18 C -0.446 4.446 19 H 0.094 0.906 20 C -0.222 4.222 21 N -0.572 5.572 22 Si 0.907 3.093 23 H -0.232 1.232 24 H -0.229 1.229 25 H -0.214 1.214 26 C 0.021 3.979 27 C -0.156 4.156 28 C -0.016 4.016 29 H 0.089 0.911 30 H 0.086 0.914 31 H 0.084 0.916 32 H 0.138 0.862 33 H 0.138 0.862 34 H 0.138 0.862 35 H 0.138 0.862 36 H 0.120 0.880 37 H 0.120 0.880 38 H 0.108 0.892 39 H 0.087 0.913 40 H 0.081 0.919 41 H 0.104 0.896 42 H 0.087 0.913 43 H 0.085 0.915 44 H 0.061 0.939 45 H 0.043 0.957 46 H 0.071 0.929 47 H 0.041 0.959 48 H 0.060 0.940 49 H 0.096 0.904 50 H 0.085 0.915 51 H 0.100 0.900 52 H 0.091 0.909 Dipole moment (debyes) X Y Z Total from point charges 3.556 22.874 17.056 28.753 hybrid contribution 1.674 0.074 0.393 1.721 sum 5.230 22.947 17.449 29.299 Atomic orbital electron populations 1.20823 0.91428 1.03112 1.01945 1.19692 0.95890 0.92598 0.98704 1.20974 0.94298 0.97291 1.01381 1.21107 0.94305 0.97993 1.00210 1.21068 0.99771 0.92476 1.01073 1.20979 0.93396 0.98265 0.99498 1.19152 0.93448 0.93141 1.00833 1.20734 1.01890 0.96305 0.95389 1.20452 0.77600 0.80630 0.90997 1.90717 1.53502 1.50856 1.45965 1.48163 1.55916 1.21934 1.08279 1.21733 1.00012 0.96779 0.82518 1.21634 1.00669 0.92800 0.99815 1.21101 0.95695 0.96497 0.93942 1.22656 0.95073 0.98980 0.99329 1.21982 0.90408 0.92244 0.96627 1.44855 1.10318 1.37850 1.40902 1.20161 0.96135 1.10970 1.17369 0.90557 1.25853 1.03335 0.96928 0.96127 1.70889 1.23261 1.39751 1.23271 0.83797 0.76401 0.74996 0.74069 1.23156 1.22850 1.21437 1.21542 0.93725 0.90144 0.92500 1.21744 1.01238 0.95369 0.97274 1.21844 1.00415 0.90353 0.89010 0.91137 0.91412 0.91638 0.86195 0.86238 0.86165 0.86224 0.87977 0.88043 0.89183 0.91282 0.91906 0.89597 0.91325 0.91541 0.93856 0.95677 0.92911 0.95919 0.93954 0.90371 0.91495 0.89971 0.90910 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 -0.12 -0.96 9.22 36.00 0.33 -0.63 16 2 C -0.07 -0.69 5.88 -104.63 -0.62 -1.31 16 3 C -0.12 -1.13 9.70 -39.58 -0.38 -1.52 16 4 C -0.12 -1.05 10.05 -39.58 -0.40 -1.45 16 5 C -0.13 -1.16 10.05 -39.59 -0.40 -1.56 16 6 C -0.10 -1.04 9.68 -39.59 -0.38 -1.42 16 7 C -0.07 -0.68 4.37 -104.62 -0.46 -1.13 16 8 C -0.10 -0.91 3.49 -29.03 -0.10 -1.01 16 9 C 0.52 6.26 6.89 -10.98 -0.08 6.19 16 10 O -0.53 -8.63 15.44 5.56 0.09 -8.55 16 11 N -0.61 -6.90 2.96 -172.56 -0.51 -7.41 16 12 C 0.11 1.45 6.12 -3.63 -0.02 1.43 16 13 C -0.11 -1.64 4.87 -27.01 -0.13 -1.77 16 14 C -0.07 -1.04 0.55 -153.98 -0.08 -1.13 16 15 C -0.12 -1.88 4.91 -25.24 -0.12 -2.00 16 16 C 0.11 2.36 4.24 -2.96 -0.01 2.35 16 17 N -0.61 -14.62 3.31 -170.17 -0.56 -15.18 16 18 C -0.32 -9.10 10.56 -15.06 -0.16 -9.26 16 19 H 0.08 2.31 8.06 -52.48 -0.42 1.89 16 20 C -0.02 -0.69 5.50 -17.43 -0.10 -0.79 16 21 N -0.93 -29.43 13.70 55.49 0.76 -28.67 16 22 Si 1.07 26.97 24.53 -169.99 -4.17 22.80 16 23 H -0.30 -7.82 7.11 56.52 0.40 -7.42 16 24 H -0.30 -7.27 6.84 56.52 0.39 -6.88 16 25 H -0.29 -6.57 5.43 56.52 0.31 -6.26 16 26 C 0.15 2.81 6.16 -2.74 -0.02 2.79 16 27 C -0.12 -1.27 4.84 -26.99 -0.13 -1.40 16 28 C 0.11 0.95 6.07 -3.61 -0.02 0.92 16 29 H 0.07 0.45 8.14 -51.93 -0.42 0.03 16 30 H 0.07 0.52 8.09 -51.93 -0.42 0.10 16 31 H 0.06 0.60 6.15 -51.93 -0.32 0.28 16 32 H 0.12 0.88 8.06 -52.49 -0.42 0.45 16 33 H 0.12 0.79 8.06 -52.48 -0.42 0.37 16 34 H 0.12 0.86 8.06 -52.48 -0.42 0.44 16 35 H 0.12 1.03 8.06 -52.48 -0.42 0.61 16 36 H 0.10 0.69 6.79 -51.93 -0.35 0.34 16 37 H 0.10 0.71 7.61 -51.93 -0.40 0.31 16 38 H 0.09 1.29 6.99 -51.93 -0.36 0.93 16 39 H 0.07 0.86 6.55 -51.93 -0.34 0.52 16 40 H 0.06 0.95 8.14 -51.93 -0.42 0.52 16 41 H 0.09 1.49 7.82 -51.93 -0.41 1.08 16 42 H 0.07 0.93 6.17 -51.93 -0.32 0.61 16 43 H 0.07 0.92 7.98 -51.93 -0.41 0.51 16 44 H 0.04 0.97 6.79 -51.93 -0.35 0.61 16 45 H 0.03 0.58 3.81 -51.93 -0.20 0.38 16 46 H 0.26 8.17 8.73 -40.82 -0.36 7.81 16 47 H 0.02 0.43 8.00 -51.93 -0.42 0.02 16 48 H 0.04 0.83 8.03 -51.93 -0.42 0.42 16 49 H 0.08 0.78 8.09 -51.93 -0.42 0.36 16 50 H 0.07 0.72 8.14 -51.93 -0.42 0.29 16 51 H 0.08 0.51 5.91 -51.93 -0.31 0.21 16 52 H 0.07 0.61 7.62 -51.93 -0.40 0.21 16 LS Contribution 388.31 15.07 5.85 5.85 Total: -1.00 -34.84 388.31 -10.31 -45.15 By element: Atomic # 1 Polarization: 7.20 SS G_CDS: -8.48 Total: -1.28 kcal Atomic # 6 Polarization: -9.43 SS G_CDS: -3.28 Total: -12.71 kcal Atomic # 7 Polarization: -50.95 SS G_CDS: -0.31 Total: -51.26 kcal Atomic # 8 Polarization: -8.63 SS G_CDS: 0.09 Total: -8.55 kcal Atomic # 14 Polarization: 26.97 SS G_CDS: -4.17 Total: 22.80 kcal Total LS contribution 5.85 Total: 5.85 kcal Total: -34.84 -10.31 -45.15 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. ZINC001035253436.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 63.010 kcal (2) G-P(sol) polarization free energy of solvation -34.842 kcal (3) G-ENP(sol) elect.-nuc.-pol. free energy of system 28.168 kcal (4) G-CDS(sol) cavity-dispersion-solvent structure free energy -10.307 kcal (5) G-P-CDS(sol) = G-P(sol) + G-CDS(sol) = (2) + (4) -45.148 kcal (6) G-S(sol) free energy of system = (1) + (5) 17.862 kcal 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED Total computer time = 3.06 seconds