Wall clock time and date at job start Sat Apr 11 2020 06:10:19 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 N 2 2 C 1.31625 * 1 3 3 Si 1.86798 * 120.00283 * 2 1 4 4 H 1.48494 * 109.47283 * 240.00337 * 3 2 1 5 5 H 1.48508 * 109.46892 * 0.02562 * 3 2 1 6 6 H 1.48500 * 109.47257 * 119.99832 * 3 2 1 7 7 C 1.38803 * 119.99761 * 180.02562 * 2 1 3 8 8 H 1.08003 * 119.99556 * 179.97438 * 7 2 1 9 9 S 1.76194 * 120.00304 * 359.97438 * 7 2 1 10 10 C 1.81004 * 100.00167 * 180.02562 * 9 7 2 11 11 C 1.50704 * 109.47198 * 179.97438 * 10 9 7 12 12 O 1.21284 * 119.99781 * 0.02562 * 11 10 9 13 13 N 1.34771 * 120.00101 * 179.97438 * 11 10 9 14 14 C 1.46497 * 120.00273 * 179.97438 * 13 11 10 15 15 C 1.52996 * 109.47511 * 180.02562 * 14 13 11 16 16 H 1.09008 * 109.49832 * 54.92279 * 15 14 13 17 17 C 1.53115 * 109.50417 * 294.80997 * 15 14 13 18 18 C 1.53124 * 109.16088 * 182.40317 * 17 15 14 19 19 C 1.53036 * 109.27908 * 57.64872 * 18 17 15 20 20 N 1.46847 * 109.52371 * 300.82364 * 19 18 17 21 21 C 1.46898 * 110.99916 * 185.84052 * 20 19 18 22 22 C 1.52998 * 109.47342 * 164.04799 * 21 20 19 23 23 C 1.54269 * 110.02932 * 293.37868 * 22 21 20 24 24 C 1.54963 * 104.16194 * 217.13481 * 23 22 21 25 25 C 1.54895 * 102.77618 * 37.88812 * 24 23 22 26 26 C 1.53873 * 110.03441 * 176.16357 * 22 21 20 27 27 C 1.46845 * 111.19890 * 61.74340 * 20 19 18 28 28 H 0.96997 * 120.00350 * 359.97438 * 1 2 3 29 29 H 1.09003 * 109.47101 * 59.99856 * 10 9 7 30 30 H 1.09002 * 109.46580 * 299.99827 * 10 9 7 31 31 H 0.97005 * 119.99666 * 0.02562 * 13 11 10 32 32 H 1.09003 * 109.46945 * 60.00353 * 14 13 11 33 33 H 1.09002 * 109.47272 * 300.00530 * 14 13 11 34 34 H 1.09007 * 109.52097 * 302.30243 * 17 15 14 35 35 H 1.08997 * 109.52939 * 62.49397 * 17 15 14 36 36 H 1.09000 * 109.50267 * 297.70788 * 18 17 15 37 37 H 1.08996 * 109.50107 * 177.59151 * 18 17 15 38 38 H 1.08992 * 109.46391 * 180.80415 * 19 18 17 39 39 H 1.09006 * 109.45975 * 60.83607 * 19 18 17 40 40 H 1.09007 * 109.46770 * 284.04467 * 21 20 19 41 41 H 1.08999 * 109.47568 * 44.04175 * 21 20 19 42 42 H 1.08995 * 110.01868 * 54.76817 * 22 21 20 43 43 H 1.09002 * 110.48740 * 335.78743 * 23 22 21 44 44 H 1.09002 * 110.48752 * 98.42255 * 23 22 21 45 45 H 1.08997 * 110.72089 * 279.57633 * 24 23 22 46 46 H 1.09000 * 110.92267 * 156.29366 * 24 23 22 47 47 H 1.08997 * 110.48790 * 203.40430 * 25 24 23 48 48 H 1.09005 * 110.59701 * 80.81310 * 25 24 23 49 49 H 1.08993 * 110.03284 * 238.56708 * 26 22 21 50 50 H 1.08998 * 110.03238 * 359.95213 * 26 22 21 51 51 H 1.08995 * 109.46717 * 58.27331 * 27 20 19 52 52 H 1.09004 * 109.46141 * 178.24503 * 27 20 19 Note: An asterisk (*) indicates this parameter was or will be optimized. Cartesian coordinates (angstroms) NO. Atom X Y Z 1 7 0.0000 0.0000 0.0000 2 6 1.3162 0.0000 0.0000 3 14 2.2503 1.6177 0.0000 4 1 3.1040 1.6964 -1.2125 5 1 1.2853 2.7465 0.0006 6 1 3.1041 1.6963 1.2125 7 6 2.0102 -1.2021 -0.0005 8 1 3.0902 -1.2021 -0.0010 9 16 1.1293 -2.7280 -0.0005 10 6 2.5158 -3.8915 -0.0005 11 6 1.9873 -5.3028 0.0001 12 8 0.7910 -5.5023 0.0000 13 7 2.8440 -6.3432 -0.0003 14 6 2.3303 -7.7151 0.0009 15 6 3.5023 -8.6986 0.0007 16 1 4.1611 -8.4796 0.8411 17 6 4.2824 -8.5642 -1.3099 18 6 5.4166 -9.5927 -1.3275 19 6 4.8289 -10.9959 -1.1620 20 7 4.0933 -11.0735 0.1065 21 6 3.6324 -12.4442 0.3649 22 6 3.2336 -12.5794 1.8358 23 6 4.4781 -12.4359 2.7360 24 6 4.2356 -13.4496 3.8827 25 6 3.5741 -14.6434 3.1503 26 6 2.6587 -13.9822 2.0992 27 6 2.9701 -10.1278 0.1277 28 1 -0.4850 0.8400 0.0004 29 1 3.1245 -3.7314 0.8895 30 1 3.1244 -3.7314 -0.8906 31 1 3.8008 -6.1835 -0.0006 32 1 1.7208 -7.8756 -0.8885 33 1 1.7226 -7.8748 0.8915 34 1 3.6139 -8.7447 -2.1518 35 1 4.7000 -7.5601 -1.3840 36 1 6.1061 -9.3880 -0.5085 37 1 5.9493 -9.5308 -2.2764 38 1 5.6351 -11.7294 -1.1598 39 1 4.1500 -11.2051 -1.9889 40 1 2.7713 -12.6630 -0.2666 41 1 4.4355 -13.1460 0.1401 42 1 2.4964 -11.8193 2.0939 43 1 5.3810 -12.6946 2.1829 44 1 4.5487 -11.4222 3.1305 45 1 3.5602 -13.0325 4.6297 46 1 5.1773 -13.7514 4.3411 47 1 2.9857 -15.2400 3.8474 48 1 4.3292 -15.2610 2.6640 49 1 1.6428 -13.9028 2.4860 50 1 2.6631 -14.5664 1.1790 51 1 2.3000 -10.3411 -0.7051 52 1 2.4263 -10.2308 1.0668 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 ZINC001690372962.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 06:10:19 Heat of formation + Delta-G solvation = -67.779778 kcal Electronic energy + Delta-G solvation = -27032.120919 eV Core-core repulsion = 23348.972380 eV Total energy + Delta-G solvation = -3683.148539 eV No. of doubly occupied orbitals = 63 Molecular weight (most abundant/longest-lived isotopes) = 340.193 amu Computer time = 0.70 seconds Orbital eigenvalues (eV) -40.05081 -39.04969 -38.08824 -35.29294 -33.33006 -32.41492 -31.68350 -29.85298 -29.20014 -28.94484 -25.81663 -25.53751 -25.31566 -23.00936 -21.80424 -20.97451 -20.41151 -19.88942 -19.72270 -17.83914 -16.77139 -16.21464 -16.08921 -15.60196 -15.47766 -15.29976 -15.00304 -14.79166 -14.69476 -14.32146 -14.05314 -13.76176 -13.61857 -13.42387 -13.31767 -13.00134 -12.82679 -12.57146 -12.32974 -12.00103 -11.74201 -11.50096 -11.42255 -11.33827 -11.30495 -11.21629 -11.03162 -11.02815 -10.93950 -10.88395 -10.81303 -10.77437 -10.64026 -10.36342 -9.80776 -9.37142 -9.04929 -8.83882 -8.62597 -8.22053 -6.48281 -6.20045 -3.90537 3.04593 3.14014 3.24534 3.28209 3.31248 3.48648 3.79792 4.22058 4.28807 4.30604 4.34462 4.45381 4.53968 4.60094 4.78965 4.88946 5.00950 5.03218 5.12146 5.13676 5.14914 5.18920 5.20803 5.24454 5.27719 5.33768 5.36275 5.42051 5.47101 5.49672 5.52089 5.57911 5.58580 5.63432 5.69419 5.73755 5.78798 5.81936 5.86293 5.92652 5.96909 5.99395 6.01986 6.14059 6.15469 6.16557 6.64699 6.77257 6.77492 7.60673 7.75111 8.36488 8.65490 9.25035 10.87341 Molecular weight = 340.19amu Principal moments of inertia in cm(-1) A = 0.021321 B = 0.001733 C = 0.001683 Principal moments of inertia in units of 10**(-40)*gram-cm**2 A = 1312.927624 B =16149.418602 C =16636.994886 Net atomic charges, atomic populations, and dipole contributions calculated with CM2 Atom NO. Type Charge No. of electrons 1 N -0.868 5.868 2 C 0.074 3.926 3 Si 0.919 3.081 4 H -0.274 1.274 5 H -0.283 1.283 6 H -0.274 1.274 7 C -0.536 4.536 8 H 0.072 0.928 9 S -0.060 6.060 10 C -0.153 4.153 11 C 0.531 3.469 12 O -0.519 6.519 13 N -0.737 5.737 14 C 0.127 3.873 15 C -0.094 4.094 16 H 0.086 0.914 17 C -0.118 4.118 18 C -0.116 4.116 19 C 0.056 3.944 20 N -0.534 5.534 21 C 0.064 3.936 22 C -0.089 4.089 23 C -0.103 4.103 24 C -0.130 4.130 25 C -0.124 4.124 26 C -0.121 4.121 27 C 0.063 3.937 28 H 0.269 0.731 29 H 0.089 0.911 30 H 0.089 0.911 31 H 0.397 0.603 32 H 0.064 0.936 33 H 0.066 0.934 34 H 0.062 0.938 35 H 0.067 0.933 36 H 0.071 0.929 37 H 0.066 0.934 38 H 0.072 0.928 39 H 0.031 0.969 40 H 0.033 0.967 41 H 0.073 0.927 42 H 0.073 0.927 43 H 0.065 0.935 44 H 0.066 0.934 45 H 0.064 0.936 46 H 0.063 0.937 47 H 0.061 0.939 48 H 0.063 0.937 49 H 0.063 0.937 50 H 0.062 0.938 51 H 0.036 0.964 52 H 0.079 0.921 For the charges calculated by CM2: Dipole moment (debyes) X Y Z Total from point charges 12.538 -29.938 1.554 32.495 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 N -0.503 5.503 2 C -0.136 4.136 3 Si 0.745 3.255 4 H -0.200 1.200 5 H -0.208 1.208 6 H -0.199 1.199 7 C -0.684 4.684 8 H 0.090 0.910 9 S 0.166 5.834 10 C -0.304 4.304 11 C 0.317 3.683 12 O -0.393 6.393 13 N -0.391 5.391 14 C 0.002 3.998 15 C -0.113 4.113 16 H 0.104 0.896 17 C -0.156 4.156 18 C -0.154 4.154 19 C -0.072 4.072 20 N -0.258 5.258 21 C -0.064 4.064 22 C -0.108 4.108 23 C -0.140 4.140 24 C -0.168 4.168 25 C -0.162 4.162 26 C -0.160 4.160 27 C -0.065 4.065 28 H 0.079 0.921 29 H 0.108 0.892 30 H 0.107 0.893 31 H 0.232 0.768 32 H 0.082 0.918 33 H 0.084 0.916 34 H 0.081 0.919 35 H 0.086 0.914 36 H 0.090 0.910 37 H 0.085 0.915 38 H 0.090 0.910 39 H 0.050 0.950 40 H 0.051 0.949 41 H 0.091 0.909 42 H 0.091 0.909 43 H 0.084 0.916 44 H 0.084 0.916 45 H 0.083 0.917 46 H 0.081 0.919 47 H 0.080 0.920 48 H 0.081 0.919 49 H 0.082 0.918 50 H 0.081 0.919 51 H 0.054 0.946 52 H 0.098 0.902 Dipole moment (debyes) X Y Z Total from point charges 10.673 -30.041 1.911 31.938 hybrid contribution 1.836 1.107 -0.704 2.256 sum 12.508 -28.934 1.207 31.545 Atomic orbital electron populations 1.70006 1.05949 1.27546 1.46802 1.24990 0.95026 0.99007 0.94549 0.86226 0.79235 0.81256 0.78788 1.19952 1.20814 1.19947 1.22833 0.94882 0.91698 1.59025 0.90984 1.85391 1.04989 0.96286 1.96717 1.23532 1.06524 0.95465 1.04879 1.20298 0.86527 0.86288 0.75176 1.90700 1.15406 1.85643 1.47590 1.45977 1.09886 1.05432 1.77840 1.21233 0.95519 0.80758 1.02254 1.21393 0.96912 0.93848 0.99159 0.89575 1.21665 0.97357 0.99434 0.97095 1.21576 0.97961 0.93818 1.02003 1.22096 0.97376 0.97957 0.89783 1.61850 1.25135 1.05517 1.33347 1.22242 0.98861 0.89470 0.95846 1.21793 0.97846 0.96840 0.94337 1.22250 0.97312 0.99053 0.95412 1.22568 1.00290 0.96043 0.97880 1.22341 0.98619 0.97566 0.97631 1.22188 0.99157 0.95612 0.99006 1.22035 0.91856 0.91221 1.01406 0.92142 0.89249 0.89279 0.76849 0.91785 0.91608 0.91948 0.91419 0.91000 0.91503 0.90955 0.95044 0.94894 0.90882 0.90904 0.91607 0.91566 0.91704 0.91857 0.91991 0.91858 0.91827 0.91936 0.94592 0.90240 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 N -0.87 -26.31 13.22 55.49 0.73 -25.58 16 2 C 0.07 2.11 5.49 -17.43 -0.10 2.02 16 3 Si 0.92 21.49 29.55 -169.99 -5.02 16.47 16 4 H -0.27 -6.25 7.11 56.52 0.40 -5.85 16 5 H -0.28 -6.50 7.11 56.52 0.40 -6.09 16 6 H -0.27 -6.25 7.11 56.52 0.40 -5.85 16 7 C -0.54 -15.37 9.50 30.94 0.29 -15.08 16 8 H 0.07 1.95 7.80 -52.48 -0.41 1.54 16 9 S -0.06 -1.66 20.57 -107.50 -2.21 -3.87 16 10 C -0.15 -3.12 6.16 36.01 0.22 -2.90 16 11 C 0.53 10.02 7.85 -10.99 -0.09 9.94 16 12 O -0.52 -11.98 15.86 5.55 0.09 -11.89 16 13 N -0.74 -9.87 5.31 -60.30 -0.32 -10.19 16 14 C 0.13 1.48 5.07 -4.05 -0.02 1.46 16 15 C -0.09 -0.81 2.39 -90.54 -0.22 -1.03 16 16 H 0.09 0.77 8.14 -51.92 -0.42 0.34 16 17 C -0.12 -0.95 5.13 -26.61 -0.14 -1.09 16 18 C -0.12 -0.81 6.09 -26.65 -0.16 -0.97 16 19 C 0.06 0.39 5.44 -3.83 -0.02 0.37 16 20 N -0.53 -4.01 4.40 -234.67 -1.03 -5.04 16 21 C 0.06 0.43 4.03 -3.83 -0.02 0.41 16 22 C -0.09 -0.60 2.95 -89.50 -0.26 -0.86 16 23 C -0.10 -0.70 6.17 -25.03 -0.15 -0.86 16 24 C -0.13 -0.81 6.91 -24.70 -0.17 -0.98 16 25 C -0.12 -0.71 6.83 -25.07 -0.17 -0.88 16 26 C -0.12 -0.73 6.46 -25.61 -0.17 -0.89 16 27 C 0.06 0.52 4.59 -3.84 -0.02 0.50 16 28 H 0.27 7.58 8.31 -40.82 -0.34 7.24 16 29 H 0.09 1.68 8.14 -51.91 -0.42 1.26 16 30 H 0.09 1.67 8.14 -51.91 -0.42 1.25 16 31 H 0.40 4.21 7.68 -40.82 -0.31 3.90 16 32 H 0.06 0.82 8.14 -51.93 -0.42 0.39 16 33 H 0.07 0.83 8.14 -51.93 -0.42 0.41 16 34 H 0.06 0.55 8.14 -51.93 -0.42 0.13 16 35 H 0.07 0.55 7.27 -51.93 -0.38 0.17 16 36 H 0.07 0.53 8.14 -51.93 -0.42 0.10 16 37 H 0.07 0.42 8.14 -51.93 -0.42 -0.01 16 38 H 0.07 0.45 7.96 -51.93 -0.41 0.04 16 39 H 0.03 0.23 8.14 -51.93 -0.42 -0.19 16 40 H 0.03 0.23 8.06 -51.93 -0.42 -0.19 16 41 H 0.07 0.46 7.76 -51.93 -0.40 0.06 16 42 H 0.07 0.55 6.52 -51.93 -0.34 0.22 16 43 H 0.07 0.47 7.78 -51.93 -0.40 0.06 16 44 H 0.07 0.51 8.14 -51.93 -0.42 0.09 16 45 H 0.06 0.42 8.14 -51.93 -0.42 -0.01 16 46 H 0.06 0.37 8.14 -51.93 -0.42 -0.06 16 47 H 0.06 0.33 8.14 -51.93 -0.42 -0.09 16 48 H 0.06 0.34 8.14 -51.93 -0.42 -0.08 16 49 H 0.06 0.39 8.14 -51.93 -0.42 -0.04 16 50 H 0.06 0.35 7.67 -51.93 -0.40 -0.05 16 51 H 0.04 0.31 8.14 -51.93 -0.42 -0.11 16 52 H 0.08 0.66 6.43 -51.93 -0.33 0.33 16 LS Contribution 414.79 15.07 6.25 6.25 Total: -1.00 -33.37 414.79 -12.41 -45.77 By element: Atomic # 1 Polarization: 8.63 SS G_CDS: -9.71 Total: -1.08 kcal Atomic # 6 Polarization: -9.66 SS G_CDS: -1.18 Total: -10.84 kcal Atomic # 7 Polarization: -40.19 SS G_CDS: -0.62 Total: -40.81 kcal Atomic # 8 Polarization: -11.98 SS G_CDS: 0.09 Total: -11.89 kcal Atomic # 14 Polarization: 21.49 SS G_CDS: -5.02 Total: 16.47 kcal Atomic # 16 Polarization: -1.66 SS G_CDS: -2.21 Total: -3.87 kcal Total LS contribution 6.25 Total: 6.25 kcal Total: -33.37 -12.41 -45.77 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. ZINC001690372962.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 -22.007 kcal (2) G-P(sol) polarization free energy of solvation -33.367 kcal (3) G-ENP(sol) elect.-nuc.-pol. free energy of system -55.374 kcal (4) G-CDS(sol) cavity-dispersion-solvent structure free energy -12.406 kcal (5) G-P-CDS(sol) = G-P(sol) + G-CDS(sol) = (2) + (4) -45.773 kcal (6) G-S(sol) free energy of system = (1) + (5) -67.780 kcal 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED Total computer time = 0.70 seconds