Wall clock time and date at job start Wed Apr 1 2020 04:45:51 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 1.53004 * 1 3 3 C 1.52999 * 109.47318 * 2 1 4 4 C 1.52992 * 109.46996 * 239.99633 * 2 1 3 5 5 N 1.46495 * 109.47497 * 294.99902 * 4 2 1 6 6 S 1.65602 * 120.00398 * 153.25725 * 5 4 2 7 7 O 1.42099 * 104.27985 * 181.07238 * 6 5 4 8 8 O 1.42101 * 104.27261 * 308.92530 * 6 5 4 9 9 C 1.81396 * 104.45049 * 64.99608 * 6 5 4 10 10 C 1.53003 * 109.47308 * 173.73864 * 9 6 5 11 11 C 1.50700 * 115.54614 * 53.96777 * 10 9 6 12 12 H 1.08000 * 120.00554 * 267.23683 * 11 10 9 13 13 C 1.37875 * 119.99693 * 87.24205 * 11 10 9 14 14 N 1.31517 * 119.99985 * 178.67674 * 13 11 10 15 15 Si 1.86797 * 120.00316 * 358.67388 * 13 11 10 16 16 H 1.48500 * 109.47380 * 84.49028 * 15 13 11 17 17 H 1.48499 * 109.47424 * 204.49621 * 15 13 11 18 18 H 1.48510 * 109.46828 * 324.49035 * 15 13 11 19 19 C 1.53006 * 117.49790 * 268.30536 * 10 9 6 20 20 C 1.52999 * 117.50050 * 199.64288 * 10 9 6 21 21 N 1.46898 * 109.46754 * 119.99683 * 2 1 3 22 22 C 1.46845 * 111.00311 * 301.08200 * 21 2 1 23 23 C 1.53041 * 109.52563 * 174.16367 * 22 21 2 24 24 C 1.53113 * 109.27738 * 59.17406 * 23 22 21 25 25 C 1.53120 * 109.16649 * 302.34614 * 24 23 22 26 26 C 1.46850 * 110.99651 * 176.86923 * 21 2 1 27 27 H 1.09007 * 109.47220 * 300.00224 * 1 2 3 28 28 H 1.09005 * 109.47083 * 60.00361 * 1 2 3 29 29 H 1.08993 * 109.47392 * 180.02562 * 1 2 3 30 30 H 1.08992 * 109.47523 * 179.97438 * 3 2 1 31 31 H 1.09005 * 109.46968 * 300.00350 * 3 2 1 32 32 H 1.09004 * 109.47312 * 59.99243 * 3 2 1 33 33 H 1.09001 * 109.47369 * 54.99954 * 4 2 1 34 34 H 1.09003 * 109.47285 * 174.99431 * 4 2 1 35 35 H 0.97002 * 119.99820 * 333.25164 * 5 4 2 36 36 H 1.09002 * 109.47451 * 293.74078 * 9 6 5 37 37 H 1.08999 * 109.46960 * 53.73903 * 9 6 5 38 38 H 0.97005 * 120.00146 * 179.97438 * 14 13 11 39 39 H 1.08997 * 117.49639 * 359.97438 * 19 10 9 40 40 H 1.08997 * 117.49840 * 145.02131 * 19 10 9 41 41 H 1.08998 * 117.49789 * 214.98042 * 20 10 9 42 42 H 1.08996 * 117.49883 * 359.97142 * 20 10 9 43 43 H 1.09003 * 109.46250 * 294.17719 * 22 21 2 44 44 H 1.09005 * 109.46406 * 54.14359 * 22 21 2 45 45 H 1.09004 * 109.50087 * 299.23661 * 23 22 21 46 46 H 1.08992 * 109.50302 * 179.12169 * 23 22 21 47 47 H 1.09007 * 109.52020 * 182.44118 * 24 23 22 48 48 H 1.09002 * 109.52298 * 62.25467 * 24 23 22 49 49 H 1.08999 * 109.50399 * 297.72126 * 25 24 23 50 50 H 1.08991 * 109.50437 * 177.59264 * 25 24 23 51 51 H 1.08993 * 109.46197 * 305.85363 * 26 21 2 52 52 H 1.08994 * 109.45972 * 65.82917 * 26 21 2 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 2.0401 1.4425 0.0000 4 6 2.0400 -0.7213 -1.2491 5 7 1.6525 -2.1328 -1.1904 6 16 1.4546 -2.9961 -2.5897 7 8 1.0623 -4.2896 -2.1511 8 8 0.5842 -2.1941 -3.3761 9 6 3.1111 -3.0492 -3.3270 10 6 3.0929 -3.9585 -4.5574 11 6 2.0528 -3.6259 -5.5959 12 1 1.0865 -4.1073 -5.5661 13 6 2.3349 -2.7070 -6.5844 14 7 1.4367 -2.4359 -7.5060 15 14 3.9928 -1.8469 -6.6146 16 1 4.9832 -2.7053 -7.3128 17 1 3.8663 -0.5529 -7.3320 18 1 4.4471 -1.5987 -5.2226 19 6 3.4373 -5.4348 -4.3499 20 6 4.4334 -4.5071 -5.0503 21 7 2.0196 -0.6924 1.1995 22 6 1.5277 -0.0416 2.4205 23 6 1.9348 -0.8701 3.6412 24 6 3.4605 -0.9912 3.6841 25 6 3.9511 -1.6278 2.3807 26 6 3.4857 -0.7772 1.1966 27 1 -0.3634 0.5139 0.8900 28 1 -0.3633 0.5138 -0.8901 29 1 -0.3634 -1.0276 0.0005 30 1 3.1300 1.4425 0.0005 31 1 1.6767 1.9563 -0.8900 32 1 1.6767 1.9564 0.8899 33 1 1.6054 -0.2619 -2.1369 34 1 3.1263 -0.6443 -1.2952 35 1 1.5119 -2.5619 -0.3319 36 1 3.4096 -2.0434 -3.6229 37 1 3.8211 -3.4390 -2.5976 38 1 1.6350 -1.7891 -8.2013 39 1 3.6772 -5.7580 -3.3370 40 1 2.9120 -6.1653 -4.9650 41 1 4.5629 -4.6277 -6.1258 42 1 5.3283 -4.2198 -4.4984 43 1 1.9588 0.9565 2.4989 44 1 0.4411 0.0344 2.3791 45 1 1.4927 -1.8640 3.5703 46 1 1.5830 -0.3787 4.5482 47 1 3.7527 -1.6168 4.5275 48 1 3.9016 -0.0005 3.7941 49 1 3.5407 -2.6335 2.2899 50 1 5.0398 -1.6775 2.3873 51 1 3.8211 -1.2355 0.2663 52 1 3.9074 0.2243 1.2808 RHF calculation, no. of doubly occupied orbitals= 64 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 ZINC000451035350.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 04:45:51 Heat of formation + Delta-G solvation = -47.372198 kcal Electronic energy + Delta-G solvation = -30725.090522 eV Core-core repulsion = 26852.370870 eV Total energy + Delta-G solvation = -3872.719652 eV No. of doubly occupied orbitals = 64 Molecular weight (most abundant/longest-lived isotopes) = 344.192 amu Computer time = 1.32 seconds Orbital eigenvalues (eV) -40.16405 -37.09018 -36.52595 -36.10574 -34.98853 -33.44613 -32.14971 -31.21369 -30.50876 -28.47694 -27.46314 -25.84891 -25.47622 -24.27071 -22.86692 -21.70284 -20.38858 -19.54736 -19.02190 -18.52110 -16.97053 -16.83648 -16.41176 -15.84202 -15.18933 -15.10873 -14.96895 -14.61988 -14.55808 -14.25504 -14.00675 -13.94531 -13.79351 -13.50476 -13.05785 -12.93692 -12.67852 -12.58745 -12.42623 -12.21771 -11.98900 -11.82426 -11.61095 -11.50024 -11.31112 -11.13260 -11.12186 -11.04402 -10.94810 -10.82997 -10.79101 -10.59963 -10.44933 -10.40424 -10.34764 -10.07807 -9.72142 -9.16441 -9.09215 -8.65089 -8.44668 -8.40481 -6.15376 -4.24568 1.08870 3.22406 3.31019 3.32923 3.46865 3.72964 4.35164 4.46509 4.55197 4.56878 4.65669 4.72256 4.79371 4.84711 4.94402 5.02149 5.04734 5.14148 5.15300 5.22617 5.34652 5.37640 5.44918 5.47992 5.48918 5.57144 5.61682 5.63834 5.73985 5.77320 5.79893 5.82949 5.84082 5.90971 5.93446 5.98374 6.01295 6.05570 6.14718 6.21686 6.23608 6.31831 6.43426 6.65305 6.87888 6.97111 6.98274 7.07472 7.48197 7.60717 8.37609 8.88626 9.45603 10.96257 Molecular weight = 344.19amu Principal moments of inertia in cm(-1) A = 0.015814 B = 0.003603 C = 0.003475 Principal moments of inertia in units of 10**(-40)*gram-cm**2 A = 1770.124500 B = 7769.525072 C = 8055.529122 Net atomic charges, atomic populations, and dipole contributions calculated with CM2 Atom NO. Type Charge No. of electrons 1 C -0.141 4.141 2 C 0.102 3.898 3 C -0.182 4.182 4 C 0.128 3.872 5 N -1.123 6.123 6 S 2.621 3.379 7 O -0.970 6.970 8 O -0.937 6.937 9 C -0.583 4.583 10 C 0.004 3.996 11 C -0.518 4.518 12 H 0.087 0.913 13 C 0.093 3.907 14 N -0.879 5.879 15 Si 0.877 3.123 16 H -0.273 1.273 17 H -0.291 1.291 18 H -0.261 1.261 19 C -0.174 4.174 20 C -0.189 4.189 21 N -0.523 5.523 22 C 0.051 3.949 23 C -0.117 4.117 24 C -0.120 4.120 25 C -0.118 4.118 26 C 0.045 3.955 27 H 0.055 0.945 28 H 0.066 0.934 29 H 0.070 0.930 30 H 0.059 0.941 31 H 0.068 0.932 32 H 0.061 0.939 33 H 0.088 0.912 34 H 0.058 0.942 35 H 0.418 0.582 36 H 0.122 0.878 37 H 0.105 0.895 38 H 0.267 0.733 39 H 0.078 0.922 40 H 0.094 0.906 41 H 0.092 0.908 42 H 0.074 0.926 43 H 0.034 0.966 44 H 0.079 0.921 45 H 0.071 0.929 46 H 0.062 0.938 47 H 0.061 0.939 48 H 0.055 0.945 49 H 0.072 0.928 50 H 0.064 0.936 51 H 0.082 0.918 52 H 0.035 0.965 For the charges calculated by CM2: Dipole moment (debyes) X Y Z Total from point charges 5.354 7.304 21.305 23.150 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 -0.199 4.199 2 C 0.011 3.989 3 C -0.241 4.241 4 C 0.000 4.000 5 N -0.881 5.881 6 S 2.715 3.285 7 O -0.960 6.960 8 O -0.926 6.926 9 C -0.714 4.714 10 C 0.002 3.998 11 C -0.555 4.555 12 H 0.104 0.896 13 C -0.112 4.112 14 N -0.514 5.514 15 Si 0.705 3.295 16 H -0.199 1.199 17 H -0.218 1.218 18 H -0.186 1.186 19 C -0.211 4.211 20 C -0.228 4.228 21 N -0.248 5.248 22 C -0.077 4.077 23 C -0.155 4.155 24 C -0.158 4.158 25 C -0.156 4.156 26 C -0.082 4.082 27 H 0.074 0.926 28 H 0.085 0.915 29 H 0.089 0.911 30 H 0.078 0.922 31 H 0.087 0.913 32 H 0.080 0.920 33 H 0.107 0.893 34 H 0.076 0.924 35 H 0.253 0.747 36 H 0.140 0.860 37 H 0.124 0.876 38 H 0.077 0.923 39 H 0.097 0.903 40 H 0.113 0.887 41 H 0.111 0.889 42 H 0.092 0.908 43 H 0.052 0.948 44 H 0.097 0.903 45 H 0.090 0.910 46 H 0.081 0.919 47 H 0.079 0.921 48 H 0.074 0.926 49 H 0.091 0.909 50 H 0.082 0.918 51 H 0.100 0.900 52 H 0.053 0.947 Dipole moment (debyes) X Y Z Total from point charges 4.301 6.678 20.641 22.117 hybrid contribution 2.054 1.454 0.267 2.531 sum 6.355 8.132 20.908 23.316 Atomic orbital electron populations 1.21907 0.92837 1.03340 1.01777 1.21244 0.96304 0.91390 0.89994 1.22460 1.01609 0.97105 1.02927 1.21314 0.98830 0.81738 0.98100 1.55841 1.87548 1.19385 1.25358 1.04732 0.77574 0.73528 0.72630 1.93507 1.81550 1.40362 1.80614 1.93580 1.60945 1.69155 1.68952 1.30331 1.22956 1.09255 1.08865 1.18815 0.96713 0.90806 0.93503 1.20360 0.99505 1.25699 1.09886 0.89556 1.24930 0.96571 0.95185 0.94526 1.69885 1.34359 1.33041 1.14072 0.86929 0.84722 0.78927 0.78928 1.19910 1.21787 1.18564 1.22964 1.03713 0.94324 1.00072 1.22997 0.93004 1.06457 1.00301 1.62037 1.09508 1.52029 1.01255 1.22173 1.00558 0.95443 0.89528 1.21589 0.95889 1.01185 0.96817 1.21570 0.95977 1.00524 0.97732 1.21594 0.99971 1.00093 0.93896 1.22227 0.87666 0.98730 0.99594 0.92623 0.91519 0.91146 0.92227 0.91325 0.92034 0.89339 0.92383 0.74684 0.86016 0.87620 0.92253 0.90322 0.88729 0.88928 0.90771 0.94800 0.90262 0.90987 0.91895 0.92058 0.92591 0.90891 0.91766 0.89971 0.94721 Number of geometries 1 Number of calculations of the screened coulomb radii 1 The total number of SCF iterations 16. 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 -0.14 -1.54 8.11 37.16 0.30 -1.24 16 2 C 0.10 1.06 0.44 -131.60 -0.06 1.01 16 3 C -0.18 -1.62 7.79 37.16 0.29 -1.33 16 4 C 0.13 1.62 4.47 -4.05 -0.02 1.61 16 5 N -1.12 -16.40 5.23 -10.62 -0.06 -16.45 16 6 S 2.62 52.56 4.97 -107.50 -0.53 52.03 16 7 O -0.97 -21.63 18.08 -57.54 -1.04 -22.67 16 8 O -0.94 -22.66 16.73 -57.54 -0.96 -23.63 16 9 C -0.58 -11.39 5.85 37.16 0.22 -11.18 16 10 C 0.00 0.10 0.96 -155.66 -0.15 -0.05 16 11 C -0.52 -14.53 8.13 -34.44 -0.28 -14.81 16 12 H 0.09 2.69 8.06 -52.49 -0.42 2.27 16 13 C 0.09 2.67 5.47 -17.82 -0.10 2.57 16 14 N -0.88 -26.75 13.96 55.43 0.77 -25.98 16 15 Si 0.88 21.12 24.94 -169.99 -4.24 16.88 16 16 H -0.27 -6.38 7.00 56.52 0.40 -5.98 16 17 H -0.29 -7.01 7.11 56.52 0.40 -6.61 16 18 H -0.26 -5.75 5.64 56.52 0.32 -5.43 16 19 C -0.17 -3.59 9.92 -26.69 -0.26 -3.85 16 20 C -0.19 -3.93 7.66 -26.69 -0.20 -4.14 16 21 N -0.52 -5.05 3.67 -219.02 -0.80 -5.85 16 22 C 0.05 0.42 4.66 -3.83 -0.02 0.40 16 23 C -0.12 -0.88 6.09 -26.65 -0.16 -1.05 16 24 C -0.12 -0.88 6.00 -26.61 -0.16 -1.04 16 25 C -0.12 -0.97 6.09 -26.65 -0.16 -1.13 16 26 C 0.05 0.41 4.67 -3.83 -0.02 0.40 16 27 H 0.05 0.50 6.26 -51.92 -0.33 0.18 16 28 H 0.07 0.75 8.14 -51.93 -0.42 0.33 16 29 H 0.07 0.86 7.75 -51.93 -0.40 0.46 16 30 H 0.06 0.51 6.60 -51.93 -0.34 0.17 16 31 H 0.07 0.61 8.14 -51.93 -0.42 0.19 16 32 H 0.06 0.50 6.56 -51.93 -0.34 0.16 16 33 H 0.09 1.23 7.53 -51.93 -0.39 0.84 16 34 H 0.06 0.64 6.52 -51.93 -0.34 0.30 16 35 H 0.42 5.59 8.04 -34.47 -0.28 5.32 16 36 H 0.12 2.31 6.31 -51.92 -0.33 1.98 16 37 H 0.11 1.66 8.09 -51.92 -0.42 1.24 16 38 H 0.27 7.57 8.31 -40.82 -0.34 7.23 16 39 H 0.08 1.43 8.14 -51.93 -0.42 1.00 16 40 H 0.09 1.97 8.14 -51.93 -0.42 1.55 16 41 H 0.09 2.01 7.15 -51.93 -0.37 1.64 16 42 H 0.07 1.35 8.14 -51.93 -0.42 0.93 16 43 H 0.03 0.28 6.65 -51.93 -0.35 -0.07 16 44 H 0.08 0.66 5.98 -51.93 -0.31 0.35 16 45 H 0.07 0.60 8.14 -51.93 -0.42 0.18 16 46 H 0.06 0.41 8.14 -51.93 -0.42 -0.02 16 47 H 0.06 0.41 8.14 -51.93 -0.42 -0.01 16 48 H 0.06 0.40 8.14 -51.93 -0.42 -0.02 16 49 H 0.07 0.66 8.14 -51.93 -0.42 0.23 16 50 H 0.06 0.48 8.14 -51.93 -0.42 0.05 16 51 H 0.08 0.80 6.04 -51.93 -0.31 0.48 16 52 H 0.03 0.30 6.69 -51.93 -0.35 -0.04 16 LS Contribution 395.70 15.07 5.96 5.96 Total: -1.00 -33.80 395.70 -10.83 -44.64 By element: Atomic # 1 Polarization: 18.06 SS G_CDS: -9.15 Total: 8.91 kcal Atomic # 6 Polarization: -33.05 SS G_CDS: -0.78 Total: -33.84 kcal Atomic # 7 Polarization: -48.20 SS G_CDS: -0.08 Total: -48.28 kcal Atomic # 8 Polarization: -44.30 SS G_CDS: -2.00 Total: -46.30 kcal Atomic # 14 Polarization: 21.12 SS G_CDS: -4.24 Total: 16.88 kcal Atomic # 16 Polarization: 52.56 SS G_CDS: -0.53 Total: 52.03 kcal Total LS contribution 5.96 Total: 5.96 kcal Total: -33.80 -10.83 -44.64 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. ZINC000451035350.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 -2.737 kcal (2) G-P(sol) polarization free energy of solvation -33.804 kcal (3) G-ENP(sol) elect.-nuc.-pol. free energy of system -36.541 kcal (4) G-CDS(sol) cavity-dispersion-solvent structure free energy -10.832 kcal (5) G-P-CDS(sol) = G-P(sol) + G-CDS(sol) = (2) + (4) -44.635 kcal (6) G-S(sol) free energy of system = (1) + (5) -47.372 kcal 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED Total computer time = 1.32 seconds