Wall clock time and date at job start Sat Mar 6 2021 01:56:22 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= 0 * 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 1.46501 * 1 3 3 C 1.34955 * 125.64234 * 2 1 4 4 C 1.35480 * 108.99097 * 180.02562 * 3 2 1 5 5 C 1.50706 * 126.07734 * 179.97438 * 4 3 2 6 6 O 1.42899 * 109.47063 * 299.99978 * 5 4 3 7 7 Si 1.86302 * 109.46760 * 180.02562 * 5 4 3 8 8 C 1.39799 * 107.84151 * 359.77789 * 4 3 2 9 9 C 1.37703 * 125.63500 * 180.02562 * 2 1 3 10 10 C 1.46498 * 126.26261 * 359.93080 * 9 2 1 11 11 O 1.21618 * 120.00055 * 179.97438 * 10 9 2 12 12 O 1.34889 * 119.99881 * 359.97438 * 10 9 2 13 13 C 1.45200 * 117.00338 * 179.97438 * 12 10 9 14 14 C 1.52999 * 109.47598 * 180.02562 * 13 12 10 15 15 H 1.08996 * 112.84840 * 316.19774 * 14 13 12 16 16 C 1.54048 * 113.69305 * 87.46574 * 14 13 12 17 17 C 1.53784 * 86.98274 * 139.99074 * 16 14 13 18 18 H 1.08997 * 113.61666 * 219.97879 * 17 16 14 19 19 N 1.46504 * 113.61186 * 89.16318 * 17 16 14 20 20 C 1.34771 * 120.00294 * 105.86510 * 19 17 16 21 21 O 1.21515 * 120.00158 * 359.97438 * 20 19 17 22 22 O 1.34637 * 120.00399 * 179.97438 * 20 19 17 23 23 C 1.45194 * 117.00311 * 179.97438 * 22 20 19 24 24 C 1.53006 * 109.46979 * 60.00565 * 23 22 20 25 25 C 1.52997 * 109.47240 * 300.00529 * 23 22 20 26 26 C 1.52999 * 109.47457 * 180.02562 * 23 22 20 27 27 C 1.53779 * 87.17421 * 334.56956 * 17 16 14 28 28 H 1.08996 * 109.46753 * 269.96036 * 1 2 3 29 29 H 1.08995 * 109.46766 * 29.95835 * 1 2 3 30 30 H 1.08999 * 109.46884 * 149.96100 * 1 2 3 31 31 H 1.08006 * 125.50241 * 0.05727 * 3 2 1 32 32 H 1.08996 * 109.46972 * 60.00123 * 5 4 3 33 33 H 0.96697 * 114.00132 * 180.02562 * 6 5 4 34 34 H 1.48498 * 110.00163 * 298.67850 * 7 5 4 35 35 H 1.48504 * 110.00158 * 60.00220 * 7 5 4 36 36 H 1.08000 * 126.51177 * 180.23500 * 8 4 3 37 37 H 1.08998 * 109.47087 * 59.99930 * 13 12 10 38 38 H 1.09002 * 109.47099 * 300.00381 * 13 12 10 39 39 H 1.08995 * 113.61751 * 25.49115 * 16 14 13 40 40 H 1.08996 * 113.69929 * 254.50418 * 16 14 13 41 41 H 0.97003 * 119.99776 * 285.86075 * 19 17 16 42 42 H 1.09001 * 109.47002 * 299.99655 * 24 23 22 43 43 H 1.08993 * 109.46955 * 60.00092 * 24 23 22 44 44 H 1.09000 * 109.47050 * 179.97438 * 24 23 22 45 45 H 1.09000 * 109.47140 * 179.97438 * 25 23 22 46 46 H 1.09001 * 109.47230 * 299.99118 * 25 23 22 47 47 H 1.09001 * 109.47375 * 59.99957 * 25 23 22 48 48 H 1.09001 * 109.47362 * 300.00827 * 26 23 22 49 49 H 1.09002 * 109.46716 * 60.00187 * 26 23 22 50 50 H 1.09000 * 109.47486 * 180.02562 * 26 23 22 51 51 H 1.08999 * 113.61486 * 140.01925 * 27 17 16 52 52 H 1.08994 * 113.61443 * 270.84509 * 27 17 16 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 2.2514 1.0967 0.0000 4 6 3.5494 0.7085 -0.0006 5 6 4.7487 1.6212 -0.0013 6 8 4.7192 2.4455 -1.1682 7 14 6.3065 0.5994 -0.0027 8 6 3.5785 -0.6892 0.0042 9 6 2.2673 -1.1192 -0.0005 10 6 1.8121 -2.5116 0.0003 11 8 2.6243 -3.4169 -0.0007 12 8 0.4922 -2.7897 0.0022 13 6 0.1138 -4.1915 0.0023 14 6 -1.4118 -4.3081 0.0039 15 1 -1.8883 -3.6176 0.6998 16 6 -2.0353 -4.2928 -1.4047 17 6 -2.9993 -5.3800 -0.9013 18 1 -3.1952 -6.1631 -1.6337 19 7 -4.2231 -4.8459 -0.2986 20 6 -5.3905 -4.9163 -0.9684 21 8 -5.4279 -5.4224 -2.0725 22 8 -6.5153 -4.4258 -0.4143 23 6 -7.7357 -4.5353 -1.1932 24 6 -8.0276 -6.0098 -1.4792 25 6 -7.5666 -3.7831 -2.5147 26 6 -8.8990 -3.9280 -0.4065 27 6 -1.9189 -5.7546 0.1270 28 1 -0.3633 -0.0007 1.0276 29 1 -0.3633 0.8903 -0.5132 30 1 -0.3633 -0.8896 -0.5144 31 1 1.9024 2.1188 0.0009 32 1 4.7271 2.2502 0.8886 33 1 5.4633 3.0594 -1.2350 34 1 6.3649 -0.2394 1.2213 35 1 6.3477 -0.2624 -1.2114 36 1 4.4596 -1.3136 0.0086 37 1 0.5165 -4.6765 0.8915 38 1 0.5139 -4.6760 -0.8884 39 1 -1.3579 -4.6376 -2.1858 40 1 -2.5287 -3.3537 -1.6552 41 1 -4.1932 -4.4416 0.5827 42 1 -7.1988 -6.4421 -2.0399 43 1 -8.1481 -6.5456 -0.5378 44 1 -8.9441 -6.0920 -2.0635 45 1 -8.4827 -3.8657 -3.0996 46 1 -7.3589 -2.7327 -2.3109 47 1 -6.7379 -4.2154 -3.0754 48 1 -9.0196 -4.4635 0.5353 49 1 -8.6909 -2.8776 -0.2030 50 1 -9.8154 -4.0106 -0.9910 51 1 -2.3185 -5.9949 1.1122 52 1 -1.2105 -6.4994 -0.2357 There are 69 doubly filled levels RHF calculation, no. of doubly occupied orbitals= 69 No. of singly occupied orbitals= 1 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=0 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 s_1458_10804114_15734084.mol2 52 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED SCF FIELD WAS ACHIEVED Wall clock time and date at job start Sat Mar 6 2021 01:56:22 Heat of formation + Delta-G solvation = -117.006314 kcal Electronic energy + Delta-G solvation = -33290.836977 eV Core-core repulsion = 28645.485428 eV Total energy + Delta-G solvation = -4645.351549 eV No. of doubly occupied orbitals = 69 and no. of open levels = 1 Molecular weight (most abundant/longest-lived isotopes) = 367.192 amu Computer time = 1.16 seconds Orbital eigenvalues (eV) -42.67744 -41.92696 -41.12938 -40.28787 -37.95117 -37.67773 -37.31785 -35.30314 -34.28830 -34.07531 -31.23215 -29.67371 -28.62998 -28.35785 -28.31682 -26.98201 -25.94993 -24.87566 -23.94046 -23.09229 -21.19566 -21.13202 -20.98197 -20.34551 -19.27720 -18.62962 -18.28082 -18.09590 -17.62771 -17.57963 -17.12252 -16.79175 -16.66454 -16.27846 -15.88475 -15.64809 -15.44738 -15.33124 -15.23114 -15.04083 -14.76266 -14.50721 -14.37792 -13.96053 -13.89224 -13.81294 -13.53923 -13.45355 -13.40099 -13.25951 -13.19941 -13.06881 -12.88473 -12.85784 -12.49725 -12.41652 -12.30104 -12.23742 -11.96515 -11.95381 -11.83982 -11.58601 -11.35141 -11.31756 -11.00936 -10.28959 -10.24344 -9.79927 -9.34914 -4.89754 0.16456 1.10646 1.33759 1.43343 1.49683 1.70540 1.80463 1.82717 2.05139 2.16720 3.04329 3.17682 3.23258 3.44075 3.56999 3.57975 3.65528 3.74598 3.76046 3.80245 3.94103 3.97348 4.01292 4.10355 4.14777 4.22035 4.25267 4.34308 4.43775 4.47904 4.49947 4.50394 4.51247 4.53788 4.60220 4.71137 4.74432 4.75338 4.81783 4.84084 4.86983 4.90248 4.93987 5.00334 5.06140 5.27060 5.31669 5.33745 5.44602 5.53298 5.56704 5.78664 6.02777 6.35151 6.71216 6.72052 7.37761 Net atomic charges, atomic populations, and dipole contributions calculated with CM2 Atom NO. Type Charge No. of electrons 1 C 0.063 3.937 2 N -0.415 5.415 3 C 0.071 3.929 4 C -0.176 4.176 5 C -0.033 4.033 6 O -0.550 6.550 7 Si 0.686 3.314 8 C -0.097 4.097 9 C -0.043 4.043 10 C 0.540 3.460 11 O -0.498 6.498 12 O -0.358 6.358 13 C 0.077 3.923 14 C -0.113 4.113 15 H 0.103 0.897 16 C -0.147 4.147 17 C 0.138 3.862 18 H 0.111 0.889 19 N -0.695 5.695 20 C 0.653 3.347 21 O -0.563 6.563 22 O -0.365 6.365 23 C 0.137 3.863 24 C -0.184 4.184 25 C -0.184 4.184 26 C -0.142 4.142 27 C -0.134 4.134 28 H 0.081 0.919 29 H 0.090 0.910 30 H 0.101 0.899 31 H 0.178 0.822 32 H 0.071 0.929 33 H 0.381 0.619 34 H -0.256 1.256 35 H -0.252 1.252 36 H 0.148 0.852 37 H 0.076 0.924 38 H 0.077 0.923 39 H 0.097 0.903 40 H 0.077 0.923 41 H 0.406 0.594 42 H 0.087 0.913 43 H 0.060 0.940 44 H 0.072 0.928 45 H 0.072 0.928 46 H 0.060 0.940 47 H 0.087 0.913 48 H 0.067 0.933 49 H 0.067 0.933 50 H 0.082 0.918 51 H 0.084 0.916 52 H 0.105 0.895 For the charges calculated by CM2: Dipole moment (debyes) X Y Z Total from point charges -1.662 4.543 2.927 5.654 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 -0.077 4.077 2 N -0.088 5.088 3 C -0.067 4.067 4 C -0.182 4.182 5 C -0.145 4.145 6 O -0.356 6.356 7 Si 0.587 3.413 8 C -0.123 4.123 9 C -0.152 4.152 10 C 0.385 3.615 11 O -0.385 6.385 12 O -0.276 6.276 13 C 0.004 3.996 14 C -0.131 4.131 15 H 0.122 0.878 16 C -0.185 4.185 17 C 0.034 3.966 18 H 0.129 0.871 19 N -0.354 5.354 20 C 0.406 3.594 21 O -0.452 6.452 22 O -0.279 6.279 23 C 0.100 3.900 24 C -0.241 4.241 25 C -0.241 4.241 26 C -0.199 4.199 27 C -0.172 4.172 28 H 0.100 0.900 29 H 0.109 0.891 30 H 0.120 0.880 31 H 0.195 0.805 32 H 0.089 0.911 33 H 0.228 0.772 34 H -0.181 1.181 35 H -0.177 1.177 36 H 0.166 0.834 37 H 0.094 0.906 38 H 0.095 0.905 39 H 0.115 0.885 40 H 0.096 0.904 41 H 0.242 0.758 42 H 0.106 0.894 43 H 0.079 0.921 44 H 0.091 0.909 45 H 0.091 0.909 46 H 0.079 0.921 47 H 0.106 0.894 48 H 0.086 0.914 49 H 0.086 0.914 50 H 0.101 0.899 51 H 0.102 0.898 52 H 0.123 0.877 Dipole moment (debyes) X Y Z Total from point charges -2.202 2.757 2.255 4.187 hybrid contribution -0.603 0.138 0.545 0.824 sum -2.805 2.895 2.800 4.908 Atomic orbital electron populations 1.22383 0.75354 1.05608 1.04366 1.43965 1.07175 1.05172 1.52518 1.21829 0.89717 0.91863 1.03316 1.18744 0.93329 0.92610 1.13483 1.23926 1.03346 0.97057 0.90149 1.86481 1.51574 1.54805 1.42753 0.95643 0.82155 0.82612 0.80890 1.21076 0.94468 0.94213 1.02504 1.19220 0.90238 0.84114 1.21661 1.19676 0.80799 0.87756 0.73289 1.90929 1.54847 1.46365 1.46385 1.86568 1.25479 1.30851 1.84660 1.23166 0.94846 0.78398 1.03232 1.22768 0.92809 0.98334 0.99204 0.87844 1.23629 0.98289 1.00282 0.96345 1.21740 0.81737 0.96903 0.96234 0.87073 1.44355 1.05031 1.64304 1.21719 1.18060 0.81097 0.77317 0.82888 1.90927 1.85844 1.48744 1.19683 1.86302 1.16508 1.75914 1.49225 1.22131 0.80207 0.96726 0.90904 1.22526 1.04081 0.94632 1.02910 1.22522 1.04550 1.00402 0.96652 1.21880 0.95562 1.01660 1.00799 1.23355 0.97412 0.95982 1.00493 0.89998 0.89124 0.88027 0.80477 0.91138 0.77196 1.18104 1.17672 0.83419 0.90592 0.90509 0.88467 0.90413 0.75842 0.89421 0.92098 0.90885 0.90886 0.92138 0.89428 0.91382 0.91403 0.89885 0.89770 0.87667 Number of geometries 1 Number of calculations of the screened coulomb radii 1 The total number of SCF iterations 12. 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 0.06 -0.13 10.56 59.85 0.63 0.50 16 2 N -0.41 -0.58 3.15 -120.41 -0.38 -0.96 16 3 C 0.07 0.09 11.25 -17.16 -0.19 -0.11 16 4 C -0.18 -0.49 5.44 -105.02 -0.57 -1.07 16 5 C -0.03 -0.01 2.99 36.01 0.11 0.10 16 6 O -0.55 -0.17 12.85 -35.23 -0.45 -0.62 16 7 Si 0.69 0.04 30.64 -169.99 -5.21 -5.17 16 8 C -0.10 -0.43 9.15 -39.09 -0.36 -0.79 16 9 C -0.04 -0.17 6.89 -81.99 -0.56 -0.73 16 10 C 0.54 2.28 7.92 34.06 0.27 2.55 16 11 O -0.50 -3.44 16.68 -19.36 -0.32 -3.76 16 12 O -0.36 -0.50 7.65 -41.01 -0.31 -0.81 16 13 C 0.08 -0.03 5.32 37.16 0.20 0.16 16 14 C -0.11 0.29 3.91 -89.67 -0.35 -0.06 16 15 H 0.10 -0.32 8.14 -51.93 -0.42 -0.74 16 16 C -0.15 0.26 7.45 -25.78 -0.19 0.06 16 17 C 0.14 -0.19 4.30 -67.12 -0.29 -0.48 16 18 H 0.11 0.00 7.50 -51.93 -0.39 -0.39 16 19 N -0.70 0.46 5.27 -57.93 -0.31 0.15 16 20 C 0.65 1.55 8.06 54.05 0.44 1.99 16 21 O -0.56 -2.71 11.50 -19.28 -0.22 -2.94 16 22 O -0.36 -0.74 9.94 -40.31 -0.40 -1.14 16 23 C 0.14 0.14 1.13 -90.62 -0.10 0.04 16 24 C -0.18 -0.21 8.37 37.16 0.31 0.10 16 25 C -0.18 -0.20 8.37 37.16 0.31 0.11 16 26 C -0.14 0.14 8.85 37.16 0.33 0.47 16 27 C -0.13 0.43 7.38 -25.92 -0.19 0.24 16 28 H 0.08 -0.25 8.14 -51.93 -0.42 -0.68 16 29 H 0.09 -0.35 8.14 -51.93 -0.42 -0.78 16 30 H 0.10 -0.17 6.15 -51.93 -0.32 -0.49 16 31 H 0.18 -0.28 8.06 -52.48 -0.42 -0.70 16 32 H 0.07 -0.11 7.96 -51.93 -0.41 -0.53 16 33 H 0.38 -1.79 8.74 45.56 0.40 -1.39 16 34 H -0.26 -0.72 7.11 56.52 0.40 -0.32 16 35 H -0.25 -0.96 7.11 56.52 0.40 -0.56 16 36 H 0.15 0.71 6.38 -52.49 -0.33 0.38 16 37 H 0.08 -0.02 8.14 -51.93 -0.42 -0.45 16 38 H 0.08 -0.01 7.85 -51.93 -0.41 -0.42 16 39 H 0.10 -0.18 7.91 -51.93 -0.41 -0.59 16 40 H 0.08 -0.07 8.14 -51.93 -0.42 -0.49 16 41 H 0.41 -1.08 8.81 -40.82 -0.36 -1.44 16 42 H 0.09 0.28 5.88 -51.93 -0.31 -0.02 16 43 H 0.06 0.05 8.14 -51.93 -0.42 -0.37 16 44 H 0.07 -0.01 8.14 -51.93 -0.42 -0.44 16 45 H 0.07 -0.01 8.14 -51.93 -0.42 -0.44 16 46 H 0.06 0.05 8.14 -51.93 -0.42 -0.38 16 47 H 0.09 0.28 5.88 -51.93 -0.31 -0.02 16 48 H 0.07 -0.07 8.14 -51.93 -0.42 -0.49 16 49 H 0.07 -0.07 8.14 -51.93 -0.42 -0.50 16 50 H 0.08 -0.18 8.14 -51.93 -0.42 -0.61 16 51 H 0.08 -0.31 8.14 -51.93 -0.42 -0.74 16 52 H 0.10 -0.40 8.10 -51.93 -0.42 -0.82 16 LS Contribution 424.28 15.07 6.39 6.39 Total: 0.00 -10.35 424.28 -9.81 -20.16 By element: Atomic # 1 Polarization: -6.01 SS G_CDS: -8.38 Total: -14.39 kcal Atomic # 6 Polarization: 3.30 SS G_CDS: -0.22 Total: 3.08 kcal Atomic # 7 Polarization: -0.12 SS G_CDS: -0.68 Total: -0.81 kcal Atomic # 8 Polarization: -7.56 SS G_CDS: -1.71 Total: -9.27 kcal Atomic # 14 Polarization: 0.04 SS G_CDS: -5.21 Total: -5.17 kcal Total LS contribution 6.39 Total: 6.39 kcal Total: -10.35 -9.81 -20.16 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. s_1458_10804114_15734084.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 -96.842 kcal (2) G-P(sol) polarization free energy of solvation -10.352 kcal (3) G-ENP(sol) elect.-nuc.-pol. free energy of system -107.194 kcal (4) G-CDS(sol) cavity-dispersion-solvent structure free energy -9.813 kcal (5) G-P-CDS(sol) = G-P(sol) + G-CDS(sol) = (2) + (4) -20.164 kcal (6) G-S(sol) free energy of system = (1) + (5) -117.006 kcal 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED Total computer time = 1.16 seconds