Wall clock time and date at job start Tue Mar 31 2020 12:28:46 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 1.52999 * 1 3 3 C 1.53005 * 109.46803 * 2 1 4 4 C 1.53000 * 109.47010 * 119.99808 * 2 1 3 5 5 O 1.42897 * 109.47294 * 65.00127 * 4 2 1 6 6 C 1.35900 * 117.00088 * 180.02562 * 5 4 2 7 7 C 1.38729 * 120.05623 * 180.02562 * 6 5 4 8 8 C 1.38138 * 119.94623 * 180.02562 * 7 6 5 9 9 C 1.38268 * 120.05583 * 0.02562 * 8 7 6 10 10 C 1.50699 * 119.94589 * 179.97438 * 9 8 7 11 11 C 1.52998 * 109.47163 * 60.00240 * 10 9 8 12 12 C 1.52994 * 109.47368 * 299.99888 * 10 9 8 13 13 N 1.46906 * 109.46990 * 179.97438 * 10 9 8 14 14 C 1.46902 * 110.99573 * 180.02562 * 13 10 9 15 15 C 1.53008 * 109.46622 * 179.97438 * 14 13 10 16 16 C 1.53004 * 109.46689 * 180.02562 * 15 14 13 17 17 C 1.50697 * 109.46812 * 180.02562 * 16 15 14 18 18 H 1.08003 * 120.00063 * 359.97438 * 17 16 15 19 19 C 1.37882 * 120.00212 * 179.97438 * 17 16 15 20 20 N 1.31517 * 119.99419 * 359.97438 * 19 17 16 21 21 Si 1.86801 * 120.00136 * 179.97438 * 19 17 16 22 22 H 1.48504 * 109.46862 * 90.00303 * 21 19 17 23 23 H 1.48500 * 109.46905 * 209.99874 * 21 19 17 24 24 H 1.48496 * 109.47023 * 329.99947 * 21 19 17 25 25 C 1.38265 * 120.10989 * 0.24916 * 9 8 7 26 26 C 1.38149 * 120.05729 * 359.45334 * 25 9 8 27 27 H 1.09003 * 109.47298 * 180.02562 * 1 2 3 28 28 H 1.09007 * 109.47532 * 300.00024 * 1 2 3 29 29 H 1.08995 * 109.47241 * 60.00168 * 1 2 3 30 30 H 1.08996 * 109.47080 * 239.99794 * 2 1 3 31 31 H 1.08999 * 109.46832 * 179.97438 * 3 2 1 32 32 H 1.09007 * 109.46842 * 299.99580 * 3 2 1 33 33 H 1.08996 * 109.47471 * 60.00033 * 3 2 1 34 34 H 1.09008 * 109.46840 * 304.99940 * 4 2 1 35 35 H 1.08998 * 109.47016 * 185.00286 * 4 2 1 36 36 H 1.08004 * 120.02842 * 359.97438 * 7 6 5 37 37 H 1.08003 * 119.97707 * 179.97438 * 8 7 6 38 38 H 1.08997 * 109.47598 * 180.02562 * 11 10 9 39 39 H 1.09002 * 109.46781 * 299.99834 * 11 10 9 40 40 H 1.09000 * 109.47321 * 59.99882 * 11 10 9 41 41 H 1.09002 * 109.47331 * 300.00208 * 12 10 9 42 42 H 1.09002 * 109.47018 * 59.99896 * 12 10 9 43 43 H 1.08999 * 109.47836 * 179.97438 * 12 10 9 44 44 H 1.00896 * 111.00309 * 56.04484 * 13 10 9 45 45 H 1.08990 * 109.47358 * 299.99539 * 14 13 10 46 46 H 1.09004 * 109.47457 * 60.00221 * 14 13 10 47 47 H 1.09006 * 109.47203 * 299.99590 * 15 14 13 48 48 H 1.08995 * 109.47152 * 60.00028 * 15 14 13 49 49 H 1.09006 * 109.46807 * 299.99641 * 16 15 14 50 50 H 1.08995 * 109.47458 * 60.00024 * 16 15 14 51 51 H 0.96997 * 119.99459 * 180.02562 * 20 19 17 52 52 H 1.08005 * 119.97337 * 179.70640 * 25 9 8 53 53 H 1.07995 * 120.03073 * 180.24950 * 26 25 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 1.5300 0.0000 0.0000 3 6 2.0399 1.4426 0.0000 4 6 2.0400 -0.7212 1.2493 5 8 1.6620 -2.0981 1.1921 6 6 2.0396 -2.8853 2.2335 7 6 1.7067 -4.2321 2.2429 8 6 2.0913 -5.0301 3.3029 9 6 2.8071 -4.4876 4.3541 10 6 3.2249 -5.3603 5.5094 11 6 4.1190 -6.4911 4.9971 12 6 1.9822 -5.9546 6.1752 13 7 3.9674 -4.5547 6.4881 14 6 4.3922 -5.3745 7.6307 15 6 5.1611 -4.5029 8.6258 16 6 5.6041 -5.3569 9.8155 17 6 6.3609 -4.4984 10.7959 18 1 6.5113 -3.4488 10.5907 19 6 6.8614 -5.0528 11.9549 20 7 6.6779 -6.3309 12.2049 21 14 7.8002 -3.9888 13.1698 22 1 6.8519 -3.4056 14.1527 23 1 8.8037 -4.8192 13.8827 24 1 8.4909 -2.8957 12.4396 25 6 3.1352 -3.1444 4.3498 26 6 2.7583 -2.3434 3.2892 27 1 -0.3634 -1.0277 0.0005 28 1 -0.3634 0.5139 0.8900 29 1 -0.3633 0.5138 -0.8899 30 1 1.8933 -0.5138 -0.8899 31 1 3.1299 1.4426 0.0005 32 1 1.6766 1.9563 -0.8901 33 1 1.6766 1.9564 0.8899 34 1 1.6053 -0.2616 2.1370 35 1 3.1263 -0.6443 1.2952 36 1 1.1465 -4.6561 1.4226 37 1 1.8320 -6.0785 3.3109 38 1 4.4209 -7.1226 5.8326 39 1 3.5684 -7.0889 4.2707 40 1 5.0044 -6.0677 4.5228 41 1 1.3451 -5.1489 6.5402 42 1 1.4316 -6.5523 5.4488 43 1 2.2843 -6.5862 7.0106 44 1 3.4214 -3.7632 6.7937 45 1 3.5152 -5.7979 8.1201 46 1 5.0371 -6.1803 7.2800 47 1 6.0383 -4.0799 8.1361 48 1 4.5167 -3.6970 8.9765 49 1 4.7272 -5.7804 10.3053 50 1 6.2488 -6.1627 9.4645 51 1 7.0296 -6.7209 13.0204 52 1 3.6903 -2.7220 5.1744 53 1 3.0183 -1.2953 3.2844 RHF calculation, no. of doubly occupied orbitals= 62 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 ZINC000107899809.mol2 53 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED SCF FIELD WAS ACHIEVED Wall clock time and date at job start Tue Mar 31 2020 12:28:46 Heat of formation + Delta-G solvation = -43.118818 kcal Electronic energy + Delta-G solvation = -26307.575354 eV Core-core repulsion = 22757.307478 eV Total energy + Delta-G solvation = -3550.267876 eV No. of doubly occupied orbitals = 62 Molecular weight (most abundant/longest-lived isotopes) = 319.225 amu Computer time = 0.80 seconds Orbital eigenvalues (eV) -40.49680 -39.03245 -36.95975 -35.48167 -34.02078 -32.24711 -31.23815 -29.89362 -28.83540 -27.59989 -27.25953 -26.99192 -25.94866 -23.29772 -22.74565 -21.92428 -20.53023 -20.13833 -19.26724 -18.38503 -16.59983 -16.39719 -16.11985 -15.98152 -14.98209 -14.84125 -14.73896 -14.61535 -14.39921 -14.01385 -13.85954 -13.52967 -13.49719 -13.00267 -12.98702 -12.81657 -12.65561 -12.54404 -12.30408 -12.14496 -11.93228 -11.62718 -11.57489 -11.52513 -11.33571 -11.19545 -11.10827 -10.86504 -10.79459 -10.76161 -10.72848 -10.48050 -10.35413 -9.65179 -9.30966 -9.05779 -9.03236 -8.32250 -8.23600 -8.04462 -5.97543 -3.99352 1.27751 1.37449 2.94625 3.33351 3.39464 3.43285 3.68920 4.30298 4.32211 4.38183 4.49589 4.61952 4.68599 4.77077 4.80375 4.97692 5.01468 5.11387 5.14465 5.19697 5.21428 5.31333 5.38241 5.38951 5.42441 5.47297 5.54603 5.61524 5.62093 5.71722 5.77989 5.81592 5.87449 5.90165 5.91744 5.97106 6.00470 6.09256 6.24446 6.32012 6.38529 6.42889 6.56037 6.68724 6.75893 6.86276 7.16816 7.27438 7.41300 7.64509 7.71274 7.86704 8.03185 8.46642 9.07844 9.64408 11.13855 Molecular weight = 319.23amu Principal moments of inertia in cm(-1) A = 0.017482 B = 0.002013 C = 0.001841 Principal moments of inertia in units of 10**(-40)*gram-cm**2 A = 1601.219045 B =13904.281545 C =15204.422405 Net atomic charges, atomic populations, and dipole contributions calculated with CM2 Atom NO. Type Charge No. of electrons 1 C -0.147 4.147 2 C -0.095 4.095 3 C -0.147 4.147 4 C 0.063 3.937 5 O -0.317 6.317 6 C 0.121 3.879 7 C -0.154 4.154 8 C -0.076 4.076 9 C -0.101 4.101 10 C 0.152 3.848 11 C -0.136 4.136 12 C -0.178 4.178 13 N -0.680 5.680 14 C 0.054 3.946 15 C -0.107 4.107 16 C 0.022 3.978 17 C -0.518 4.518 18 H 0.055 0.945 19 C 0.055 3.945 20 N -0.896 5.896 21 Si 0.892 3.108 22 H -0.281 1.281 23 H -0.287 1.287 24 H -0.274 1.274 25 C -0.063 4.063 26 C -0.209 4.209 27 H 0.062 0.938 28 H 0.054 0.946 29 H 0.056 0.944 30 H 0.080 0.920 31 H 0.058 0.942 32 H 0.064 0.936 33 H 0.058 0.942 34 H 0.061 0.939 35 H 0.061 0.939 36 H 0.126 0.874 37 H 0.126 0.874 38 H 0.063 0.937 39 H 0.055 0.945 40 H 0.063 0.937 41 H 0.054 0.946 42 H 0.058 0.942 43 H 0.066 0.934 44 H 0.337 0.663 45 H 0.029 0.971 46 H 0.071 0.929 47 H 0.055 0.945 48 H 0.043 0.957 49 H 0.013 0.987 50 H 0.016 0.984 51 H 0.260 0.740 52 H 0.138 0.862 53 H 0.124 0.876 For the charges calculated by CM2: Dipole moment (debyes) X Y Z Total from point charges -13.194 8.703 -25.686 30.159 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 -0.204 4.204 2 C -0.113 4.113 3 C -0.204 4.204 4 C -0.012 4.012 5 O -0.231 6.231 6 C 0.076 3.924 7 C -0.173 4.173 8 C -0.095 4.095 9 C -0.102 4.102 10 C 0.061 3.939 11 C -0.194 4.194 12 C -0.237 4.237 13 N -0.311 5.311 14 C -0.074 4.074 15 C -0.145 4.145 16 C -0.015 4.015 17 C -0.556 4.556 18 H 0.073 0.927 19 C -0.146 4.146 20 N -0.536 5.536 21 Si 0.720 3.280 22 H -0.207 1.207 23 H -0.212 1.212 24 H -0.199 1.199 25 C -0.081 4.081 26 C -0.228 4.228 27 H 0.081 0.919 28 H 0.073 0.927 29 H 0.075 0.925 30 H 0.099 0.901 31 H 0.077 0.923 32 H 0.083 0.917 33 H 0.077 0.923 34 H 0.080 0.920 35 H 0.080 0.920 36 H 0.144 0.856 37 H 0.144 0.856 38 H 0.082 0.918 39 H 0.074 0.926 40 H 0.082 0.918 41 H 0.073 0.927 42 H 0.077 0.923 43 H 0.085 0.915 44 H 0.155 0.845 45 H 0.047 0.953 46 H 0.089 0.911 47 H 0.074 0.926 48 H 0.062 0.938 49 H 0.031 0.969 50 H 0.034 0.966 51 H 0.069 0.931 52 H 0.155 0.845 53 H 0.142 0.858 Dipole moment (debyes) X Y Z Total from point charges -12.650 8.463 -26.056 30.175 hybrid contribution -0.192 0.548 1.412 1.526 sum -12.842 9.011 -24.644 29.214 Atomic orbital electron populations 1.21820 0.94357 1.02535 1.01714 1.21125 0.96962 0.95825 0.97424 1.21791 1.01317 0.94781 1.02534 1.22889 0.99558 0.79691 0.99060 1.86013 1.74514 1.20766 1.41773 1.18985 0.95246 0.90886 0.87269 1.20308 1.05412 0.90956 1.00609 1.20745 0.96735 0.99406 0.92579 1.19720 0.99941 0.94253 0.96301 1.19668 0.91869 0.92100 0.90307 1.21892 0.99637 0.96756 1.01070 1.22569 0.98187 1.01516 1.01465 1.60811 1.44075 1.10596 1.15585 1.22227 0.98391 0.96737 0.90031 1.21623 0.98583 0.98227 0.96051 1.19059 0.96150 0.94961 0.91357 1.21261 1.34468 0.95728 1.04183 0.92714 1.25035 0.96408 0.94969 0.98156 1.69968 1.46373 1.11319 1.25907 0.86601 0.79754 0.80384 0.81307 1.20736 1.21249 1.19879 1.20969 0.96658 0.92942 0.97547 1.21257 1.04756 1.00720 0.96017 0.91860 0.92696 0.92532 0.90131 0.92267 0.91720 0.92268 0.92029 0.92034 0.85587 0.85621 0.91804 0.92614 0.91760 0.92678 0.92275 0.91506 0.84467 0.95274 0.91080 0.92638 0.93790 0.96855 0.96597 0.93077 0.84478 0.85795 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 -0.15 -0.93 9.09 37.16 0.34 -0.59 16 2 C -0.09 -0.60 3.16 -90.62 -0.29 -0.89 16 3 C -0.15 -0.72 9.19 37.16 0.34 -0.38 16 4 C 0.06 0.50 4.12 37.16 0.15 0.65 16 5 O -0.32 -3.32 9.67 -19.43 -0.19 -3.50 16 6 C 0.12 1.36 6.69 -39.22 -0.26 1.10 16 7 C -0.15 -1.66 9.99 -39.44 -0.39 -2.06 16 8 C -0.08 -0.82 8.70 -39.61 -0.34 -1.16 16 9 C -0.10 -1.21 4.78 -104.60 -0.50 -1.71 16 10 C 0.15 1.89 0.79 -132.75 -0.11 1.78 16 11 C -0.14 -1.66 8.05 37.16 0.30 -1.36 16 12 C -0.18 -2.10 8.04 37.15 0.30 -1.80 16 13 N -0.68 -9.74 5.10 -101.14 -0.52 -10.25 16 14 C 0.05 0.92 4.90 -3.82 -0.02 0.90 16 15 C -0.11 -2.21 5.41 -26.72 -0.14 -2.35 16 16 C 0.02 0.58 4.97 -27.88 -0.14 0.44 16 17 C -0.52 -14.86 9.11 -34.44 -0.31 -15.17 16 18 H 0.05 1.53 7.74 -52.48 -0.41 1.12 16 19 C 0.06 1.60 5.46 -17.82 -0.10 1.50 16 20 N -0.90 -27.17 13.29 55.43 0.74 -26.43 16 21 Si 0.89 21.89 29.54 -169.99 -5.02 16.87 16 22 H -0.28 -6.79 7.11 56.52 0.40 -6.39 16 23 H -0.29 -6.96 7.11 56.52 0.40 -6.56 16 24 H -0.27 -6.59 7.11 56.52 0.40 -6.19 16 25 C -0.06 -0.75 9.14 -39.60 -0.36 -1.11 16 26 C -0.21 -2.31 9.04 -39.43 -0.36 -2.67 16 27 H 0.06 0.47 7.82 -51.93 -0.41 0.06 16 28 H 0.05 0.34 8.14 -51.93 -0.42 -0.09 16 29 H 0.06 0.30 8.14 -51.93 -0.42 -0.13 16 30 H 0.08 0.53 8.14 -51.93 -0.42 0.11 16 31 H 0.06 0.28 8.14 -51.93 -0.42 -0.15 16 32 H 0.06 0.27 8.14 -51.93 -0.42 -0.15 16 33 H 0.06 0.28 8.14 -51.93 -0.42 -0.14 16 34 H 0.06 0.46 7.66 -51.92 -0.40 0.06 16 35 H 0.06 0.46 7.67 -51.93 -0.40 0.06 16 36 H 0.13 1.17 8.06 -52.48 -0.42 0.74 16 37 H 0.13 1.13 7.09 -52.48 -0.37 0.76 16 38 H 0.06 0.82 6.40 -51.93 -0.33 0.49 16 39 H 0.05 0.57 7.38 -51.93 -0.38 0.19 16 40 H 0.06 0.84 8.14 -51.93 -0.42 0.41 16 41 H 0.05 0.65 8.14 -51.93 -0.42 0.23 16 42 H 0.06 0.60 7.38 -51.93 -0.38 0.22 16 43 H 0.07 0.85 6.41 -51.93 -0.33 0.51 16 44 H 0.34 4.61 7.54 -39.29 -0.30 4.31 16 45 H 0.03 0.50 6.31 -51.93 -0.33 0.17 16 46 H 0.07 1.24 6.30 -51.93 -0.33 0.91 16 47 H 0.05 1.17 8.14 -51.93 -0.42 0.75 16 48 H 0.04 0.89 8.14 -51.93 -0.42 0.47 16 49 H 0.01 0.36 8.14 -51.93 -0.42 -0.06 16 50 H 0.02 0.43 8.14 -51.93 -0.42 0.01 16 51 H 0.26 7.42 8.31 -40.82 -0.34 7.08 16 52 H 0.14 1.64 6.39 -52.48 -0.34 1.30 16 53 H 0.12 1.16 6.30 -52.49 -0.33 0.83 16 LS Contribution 412.01 15.07 6.21 6.21 Total: -1.00 -30.71 412.01 -10.33 -41.04 By element: Atomic # 1 Polarization: 10.61 SS G_CDS: -9.66 Total: 0.95 kcal Atomic # 6 Polarization: -22.98 SS G_CDS: -1.89 Total: -24.88 kcal Atomic # 7 Polarization: -36.91 SS G_CDS: 0.22 Total: -36.69 kcal Atomic # 8 Polarization: -3.32 SS G_CDS: -0.19 Total: -3.50 kcal Atomic # 14 Polarization: 21.89 SS G_CDS: -5.02 Total: 16.87 kcal Total LS contribution 6.21 Total: 6.21 kcal Total: -30.71 -10.33 -41.04 kcal The number of atoms in the molecule is 53 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. ZINC000107899809.mol2 53 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 -2.078 kcal (2) G-P(sol) polarization free energy of solvation -30.708 kcal (3) G-ENP(sol) elect.-nuc.-pol. free energy of system -32.786 kcal (4) G-CDS(sol) cavity-dispersion-solvent structure free energy -10.333 kcal (5) G-P-CDS(sol) = G-P(sol) + G-CDS(sol) = (2) + (4) -41.041 kcal (6) G-S(sol) free energy of system = (1) + (5) -43.119 kcal 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED Total computer time = 0.80 seconds