Wall clock time and date at job start Sat Apr 11 2020 06:12:12 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 1.46500 * 1 3 3 C 1.34781 * 119.99444 * 2 1 4 4 O 1.21282 * 119.99787 * 179.97438 * 3 2 1 5 5 C 1.50705 * 120.00432 * 0.02562 * 3 2 1 6 6 S 1.80993 * 109.47123 * 179.97438 * 5 3 2 7 7 C 1.76206 * 99.99888 * 179.97438 * 6 5 3 8 8 H 1.07997 * 119.99482 * 359.97438 * 7 6 5 9 9 C 1.38792 * 119.99888 * 180.02562 * 7 6 5 10 10 N 1.31625 * 120.00585 * 359.97438 * 9 7 6 11 11 Si 1.86807 * 119.99754 * 179.97438 * 9 7 6 12 12 H 1.48495 * 109.47063 * 0.02562 * 11 9 7 13 13 H 1.48500 * 109.46967 * 119.99770 * 11 9 7 14 14 H 1.48498 * 109.47269 * 239.99917 * 11 9 7 15 15 C 1.46500 * 120.00542 * 180.02562 * 2 1 3 16 16 H 1.08998 * 110.64391 * 178.30303 * 15 2 1 17 17 C 1.54597 * 110.71920 * 301.45225 * 15 2 1 18 18 C 1.53994 * 105.13867 * 140.31628 * 17 15 2 19 19 N 1.47906 * 107.05692 * 1.22245 * 18 17 15 20 20 C 1.46901 * 111.00115 * 214.15615 * 19 18 17 21 21 C 1.52992 * 109.47338 * 174.73392 * 20 19 18 22 22 C 1.52993 * 109.47611 * 174.72563 * 21 20 19 23 23 C 1.52992 * 109.47611 * 179.97438 * 22 21 20 24 24 C 1.53774 * 113.61708 * 274.13688 * 23 22 21 25 25 C 1.53957 * 87.02168 * 220.04821 * 24 23 22 26 26 C 1.53782 * 113.61527 * 176.52525 * 23 22 21 27 27 C 1.48530 * 105.81967 * 334.67214 * 19 18 17 28 28 H 1.08996 * 109.47331 * 269.99573 * 1 2 3 29 29 H 1.08997 * 109.47465 * 29.99821 * 1 2 3 30 30 H 1.09007 * 109.46562 * 149.99429 * 1 2 3 31 31 H 1.08999 * 109.46561 * 299.99862 * 5 3 2 32 32 H 1.09002 * 109.46793 * 59.99357 * 5 3 2 33 33 H 0.97001 * 120.00341 * 180.02562 * 10 9 7 34 34 H 1.09000 * 110.31305 * 21.40191 * 17 15 2 35 35 H 1.09003 * 110.39270 * 259.27589 * 17 15 2 36 36 H 1.09003 * 109.91676 * 241.87430 * 18 17 15 37 37 H 1.08993 * 110.08091 * 120.66690 * 18 17 15 38 38 H 1.09007 * 109.47061 * 294.73775 * 20 19 18 39 39 H 1.09000 * 109.46710 * 54.73397 * 20 19 18 40 40 H 1.09001 * 109.47064 * 294.72946 * 21 20 19 41 41 H 1.09007 * 109.47179 * 54.72251 * 21 20 19 42 42 H 1.09010 * 109.47014 * 300.00079 * 22 21 20 43 43 H 1.08999 * 109.47199 * 59.99301 * 22 21 20 44 44 H 1.09000 * 112.85043 * 45.33212 * 23 22 21 45 45 H 1.09004 * 113.61428 * 334.56428 * 24 23 22 46 46 H 1.08993 * 113.61702 * 105.46825 * 24 23 22 47 47 H 1.09002 * 113.53503 * 270.81009 * 25 24 23 48 48 H 1.09001 * 113.67083 * 139.93430 * 25 24 23 49 49 H 1.09004 * 113.61624 * 254.52636 * 26 23 22 50 50 H 1.09001 * 113.61456 * 25.43529 * 26 23 22 51 51 H 1.08998 * 110.66903 * 157.64363 * 27 19 18 52 52 H 1.09002 * 110.66553 * 280.76884 * 27 19 18 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 2.1388 1.1673 0.0000 4 8 3.3516 1.1674 0.0005 5 6 1.3852 2.4724 0.0006 6 16 2.5614 3.8481 0.0012 7 6 1.4412 5.2083 0.0010 8 1 0.3759 5.0305 0.0002 9 6 1.9279 6.5081 0.0009 10 7 3.2261 6.7249 0.0013 11 14 0.7402 7.9501 0.0000 12 1 -0.6551 7.4421 0.0002 13 1 0.9654 8.7775 1.2124 14 1 0.9664 8.7769 -1.2126 15 6 2.1976 -1.2687 -0.0006 16 1 3.2727 -1.0916 -0.0307 17 6 1.8178 -2.1202 1.2326 18 6 1.7357 -3.5672 0.7123 19 7 2.0813 -3.5316 -0.7254 20 6 1.3174 -4.5375 -1.4756 21 6 1.6023 -4.3835 -2.9708 22 6 0.9119 -5.5112 -3.7404 23 6 1.1962 -5.3569 -5.2357 24 6 0.2165 -4.4149 -5.9551 25 6 0.2386 -5.4157 -7.1247 26 6 0.6150 -6.4930 -6.0938 27 6 1.7512 -2.1590 -1.1873 28 1 -0.3634 -0.0001 1.0276 29 1 -0.3634 0.8900 -0.5138 30 1 -0.3633 -0.8900 -0.5140 31 1 0.7583 2.5303 -0.8892 32 1 0.7588 2.5299 0.8908 33 1 3.5662 7.6333 0.0016 34 1 0.8519 -1.8047 1.6273 35 1 2.5854 -2.0378 2.0021 36 1 0.7238 -3.9514 0.8415 37 1 2.4438 -4.1985 1.2488 38 1 1.6128 -5.5350 -1.1502 39 1 0.2523 -4.3960 -1.2921 40 1 1.2219 -3.4221 -3.3160 41 1 2.6776 -4.4315 -3.1427 42 1 1.2924 -6.4727 -3.3952 43 1 -0.1634 -5.4632 -3.5685 44 1 2.2436 -5.1419 -5.4475 45 1 -0.7541 -4.3374 -5.4651 46 1 0.6459 -3.4440 -6.2019 47 1 1.0238 -5.2159 -7.8539 48 1 -0.7371 -5.5732 -7.5844 49 1 1.3657 -7.1972 -6.4525 50 1 -0.2464 -6.9847 -5.6418 51 1 2.3132 -1.9105 -2.0875 52 1 0.6798 -2.0591 -1.3616 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 ZINC001269218541.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 06:12:12 Heat of formation + Delta-G solvation = -20.997354 kcal Electronic energy + Delta-G solvation = -27052.589919 eV Core-core repulsion = 23371.470018 eV Total energy + Delta-G solvation = -3681.119901 eV No. of doubly occupied orbitals = 63 Molecular weight (most abundant/longest-lived isotopes) = 340.193 amu Computer time = 1.98 seconds Orbital eigenvalues (eV) -40.18658 -39.34273 -38.43677 -35.49763 -33.95450 -32.43156 -31.06709 -29.59619 -28.20423 -27.14339 -26.53080 -25.94237 -25.47544 -23.46228 -21.93429 -21.18202 -20.64983 -19.68754 -19.06535 -17.72250 -16.98208 -16.48713 -16.11823 -15.85419 -15.32777 -15.21242 -15.04408 -14.80938 -14.46161 -14.33394 -13.77483 -13.70709 -13.36657 -13.14830 -12.96090 -12.81161 -12.77632 -12.66046 -12.40701 -12.28438 -12.09183 -11.82239 -11.72061 -11.59460 -11.53211 -11.37364 -11.07473 -11.02175 -10.96386 -10.87919 -10.76822 -10.71956 -10.45393 -10.31047 -9.79878 -9.36317 -9.07639 -8.68562 -8.52995 -8.22064 -6.50110 -6.21839 -3.92386 2.86278 3.03031 3.21173 3.24640 3.30391 3.54491 3.79025 4.19869 4.21355 4.29539 4.33616 4.41940 4.49405 4.55404 4.75213 4.79624 4.88991 4.92281 4.96049 5.02919 5.13094 5.14814 5.19662 5.21957 5.25597 5.34320 5.36678 5.37494 5.43475 5.44255 5.48385 5.54463 5.57278 5.59771 5.62805 5.65522 5.73000 5.74657 5.82641 5.88858 5.95642 5.99005 6.01834 6.07229 6.12577 6.17550 6.48287 6.75230 6.77244 7.52110 7.59700 8.35146 8.54922 9.23505 10.85608 Molecular weight = 340.19amu Principal moments of inertia in cm(-1) A = 0.013315 B = 0.001993 C = 0.001813 Principal moments of inertia in units of 10**(-40)*gram-cm**2 A = 2102.393947 B =14044.049198 C =15437.267193 Net atomic charges, atomic populations, and dipole contributions calculated with CM2 Atom NO. Type Charge No. of electrons 1 C 0.077 3.923 2 N -0.617 5.617 3 C 0.535 3.465 4 O -0.514 6.514 5 C -0.149 4.149 6 S -0.061 6.061 7 C -0.534 4.534 8 H 0.073 0.927 9 C 0.073 3.927 10 N -0.867 5.867 11 Si 0.919 3.081 12 H -0.272 1.272 13 H -0.280 1.280 14 H -0.280 1.280 15 C 0.140 3.860 16 H 0.116 0.884 17 C -0.143 4.143 18 C 0.039 3.961 19 N -0.515 5.515 20 C 0.049 3.951 21 C -0.118 4.118 22 C -0.107 4.107 23 C -0.110 4.110 24 C -0.139 4.139 25 C -0.145 4.145 26 C -0.139 4.139 27 C 0.026 3.974 28 H 0.054 0.946 29 H 0.077 0.923 30 H 0.066 0.934 31 H 0.089 0.911 32 H 0.089 0.911 33 H 0.268 0.732 34 H 0.072 0.928 35 H 0.078 0.922 36 H 0.044 0.956 37 H 0.081 0.919 38 H 0.075 0.925 39 H 0.032 0.968 40 H 0.063 0.937 41 H 0.072 0.928 42 H 0.063 0.937 43 H 0.060 0.940 44 H 0.090 0.910 45 H 0.079 0.921 46 H 0.066 0.934 47 H 0.079 0.921 48 H 0.065 0.935 49 H 0.064 0.936 50 H 0.079 0.921 51 H 0.087 0.913 52 H 0.051 0.949 For the charges calculated by CM2: Dipole moment (debyes) X Y Z Total from point charges -9.180 -27.750 -6.356 29.912 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 -0.066 4.066 2 N -0.353 5.353 3 C 0.323 3.677 4 O -0.387 6.387 5 C -0.300 4.300 6 S 0.165 5.835 7 C -0.683 4.683 8 H 0.091 0.909 9 C -0.136 4.136 10 N -0.502 5.502 11 Si 0.745 3.255 12 H -0.196 1.196 13 H -0.206 1.206 14 H -0.206 1.206 15 C 0.035 3.965 16 H 0.134 0.866 17 C -0.182 4.182 18 C -0.089 4.089 19 N -0.239 5.239 20 C -0.079 4.079 21 C -0.156 4.156 22 C -0.145 4.145 23 C -0.128 4.128 24 C -0.176 4.176 25 C -0.182 4.182 26 C -0.176 4.176 27 C -0.102 4.102 28 H 0.073 0.927 29 H 0.096 0.904 30 H 0.085 0.915 31 H 0.108 0.892 32 H 0.107 0.893 33 H 0.078 0.922 34 H 0.091 0.909 35 H 0.097 0.903 36 H 0.062 0.938 37 H 0.099 0.901 38 H 0.093 0.907 39 H 0.051 0.949 40 H 0.081 0.919 41 H 0.091 0.909 42 H 0.082 0.918 43 H 0.079 0.921 44 H 0.108 0.892 45 H 0.097 0.903 46 H 0.085 0.915 47 H 0.097 0.903 48 H 0.083 0.917 49 H 0.083 0.917 50 H 0.097 0.903 51 H 0.106 0.894 52 H 0.069 0.931 Dipole moment (debyes) X Y Z Total from point charges -6.690 -27.733 -6.431 29.245 hybrid contribution -3.213 1.043 0.152 3.382 sum -9.903 -26.690 -6.279 29.152 Atomic orbital electron populations 1.21748 0.80066 1.03061 1.01724 1.47802 1.06567 1.05304 1.75600 1.20368 0.87958 0.84500 0.74892 1.90695 1.13727 1.86691 1.47632 1.23557 1.04544 0.97189 1.04705 1.85417 1.08039 0.93328 1.96691 1.22897 0.94330 0.92205 1.58841 0.90907 1.24993 0.95672 0.98386 0.94565 1.70026 1.11725 1.21557 1.46917 0.86120 0.80340 0.81142 0.77908 1.19634 1.20569 1.20557 1.21863 0.98975 0.82374 0.93283 0.86645 1.22778 1.02752 0.94033 0.98631 1.22825 0.99701 0.97103 0.89258 1.64754 1.53358 1.03217 1.02578 1.22321 0.95168 0.96231 0.94192 1.21612 1.01695 0.98980 0.93292 1.21522 1.00311 0.98629 0.94013 1.22554 0.99521 0.96772 0.93993 1.23010 0.99670 0.97849 0.97087 1.22847 1.01651 0.97071 0.96650 1.22946 1.00823 0.96464 0.97404 1.23565 0.99526 0.88311 0.98845 0.92738 0.90425 0.91535 0.89249 0.89274 0.92231 0.90887 0.90303 0.93777 0.90096 0.90665 0.94933 0.91852 0.90907 0.91846 0.92128 0.89208 0.90254 0.91490 0.90282 0.91653 0.91679 0.90272 0.89427 0.93139 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 0.82 9.15 59.85 0.55 1.36 16 2 N -0.62 -8.76 2.88 -171.81 -0.50 -9.25 16 3 C 0.53 10.23 7.69 -10.98 -0.08 10.15 16 4 O -0.51 -11.84 15.23 5.56 0.08 -11.75 16 5 C -0.15 -3.04 4.71 36.01 0.17 -2.87 16 6 S -0.06 -1.68 20.57 -107.50 -2.21 -3.89 16 7 C -0.53 -15.22 9.50 30.94 0.29 -14.93 16 8 H 0.07 1.96 7.80 -52.49 -0.41 1.55 16 9 C 0.07 2.09 5.49 -17.44 -0.10 1.99 16 10 N -0.87 -26.18 13.22 55.49 0.73 -25.45 16 11 Si 0.92 21.39 29.55 -169.99 -5.02 16.37 16 12 H -0.27 -6.12 7.11 56.52 0.40 -5.72 16 13 H -0.28 -6.42 7.11 56.52 0.40 -6.02 16 14 H -0.28 -6.41 7.11 56.52 0.40 -6.01 16 15 C 0.14 1.79 3.47 -66.07 -0.23 1.56 16 16 H 0.12 1.80 6.99 -51.93 -0.36 1.44 16 17 C -0.14 -1.48 6.55 -25.37 -0.17 -1.64 16 18 C 0.04 0.35 6.70 -2.75 -0.02 0.33 16 19 N -0.51 -5.03 5.36 -230.46 -1.24 -6.27 16 20 C 0.05 0.39 4.87 -3.83 -0.02 0.37 16 21 C -0.12 -0.89 4.86 -26.74 -0.13 -1.02 16 22 C -0.11 -0.67 5.04 -26.74 -0.13 -0.81 16 23 C -0.11 -0.72 3.64 -89.81 -0.33 -1.04 16 24 C -0.14 -0.93 7.65 -25.83 -0.20 -1.13 16 25 C -0.14 -0.89 8.09 -25.83 -0.21 -1.10 16 26 C -0.14 -0.83 7.65 -25.92 -0.20 -1.02 16 27 C 0.03 0.28 4.85 -1.90 -0.01 0.27 16 28 H 0.05 0.52 7.90 -51.93 -0.41 0.11 16 29 H 0.08 0.82 6.44 -51.93 -0.33 0.49 16 30 H 0.07 0.57 6.06 -51.93 -0.31 0.25 16 31 H 0.09 1.68 7.40 -51.92 -0.38 1.29 16 32 H 0.09 1.69 8.11 -51.91 -0.42 1.27 16 33 H 0.27 7.49 8.31 -40.82 -0.34 7.15 16 34 H 0.07 0.71 6.99 -51.93 -0.36 0.35 16 35 H 0.08 0.84 8.14 -51.93 -0.42 0.42 16 36 H 0.04 0.35 7.65 -51.93 -0.40 -0.05 16 37 H 0.08 0.68 8.14 -51.93 -0.42 0.26 16 38 H 0.07 0.55 8.14 -51.92 -0.42 0.13 16 39 H 0.03 0.25 7.95 -51.93 -0.41 -0.16 16 40 H 0.06 0.52 7.17 -51.93 -0.37 0.15 16 41 H 0.07 0.62 8.14 -51.93 -0.42 0.20 16 42 H 0.06 0.38 8.14 -51.92 -0.42 -0.04 16 43 H 0.06 0.37 7.87 -51.93 -0.41 -0.03 16 44 H 0.09 0.62 8.14 -51.93 -0.42 0.20 16 45 H 0.08 0.52 7.92 -51.93 -0.41 0.11 16 46 H 0.07 0.48 8.14 -51.93 -0.42 0.06 16 47 H 0.08 0.47 8.14 -51.93 -0.42 0.05 16 48 H 0.06 0.38 8.14 -51.93 -0.42 -0.05 16 49 H 0.06 0.37 8.14 -51.93 -0.42 -0.06 16 50 H 0.08 0.44 8.10 -51.93 -0.42 0.02 16 51 H 0.09 1.02 7.77 -51.93 -0.40 0.62 16 52 H 0.05 0.50 5.95 -51.93 -0.31 0.19 16 LS Contribution 415.84 15.07 6.27 6.27 Total: -1.00 -33.18 415.84 -12.19 -45.36 By element: Atomic # 1 Polarization: 7.65 SS G_CDS: -9.50 Total: -1.85 kcal Atomic # 6 Polarization: -8.73 SS G_CDS: -0.81 Total: -9.53 kcal Atomic # 7 Polarization: -39.98 SS G_CDS: -1.00 Total: -40.97 kcal Atomic # 8 Polarization: -11.84 SS G_CDS: 0.08 Total: -11.75 kcal Atomic # 14 Polarization: 21.39 SS G_CDS: -5.02 Total: 16.37 kcal Atomic # 16 Polarization: -1.68 SS G_CDS: -2.21 Total: -3.89 kcal Total LS contribution 6.27 Total: 6.27 kcal Total: -33.18 -12.19 -45.36 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. ZINC001269218541.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 24.364 kcal (2) G-P(sol) polarization free energy of solvation -33.176 kcal (3) G-ENP(sol) elect.-nuc.-pol. free energy of system -8.811 kcal (4) G-CDS(sol) cavity-dispersion-solvent structure free energy -12.186 kcal (5) G-P-CDS(sol) = G-P(sol) + G-CDS(sol) = (2) + (4) -45.362 kcal (6) G-S(sol) free energy of system = (1) + (5) -20.997 kcal 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED Total computer time = 1.98 seconds