Wall clock time and date at job start Sat Apr 11 2020 06:10:25 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 1.53005 * 1 3 3 O 1.42898 * 109.47146 * 2 1 4 4 C 1.42902 * 113.99964 * 182.42067 * 3 2 1 5 5 H 1.08999 * 109.47215 * 340.80127 * 4 3 2 6 6 C 1.50705 * 109.46952 * 220.80223 * 4 3 2 7 7 O 1.21274 * 120.00003 * 349.65577 * 6 4 3 8 8 N 1.34773 * 119.99398 * 169.66030 * 6 4 3 9 9 C 1.46492 * 120.00474 * 4.74510 * 8 6 4 10 10 C 1.50708 * 109.46901 * 268.48590 * 9 8 6 11 11 H 1.07994 * 119.99912 * 0.02562 * 10 9 8 12 12 C 1.37875 * 119.99874 * 180.02562 * 10 9 8 13 13 N 1.31513 * 120.00335 * 359.97438 * 12 10 9 14 14 Si 1.86803 * 119.99750 * 180.02562 * 12 10 9 15 15 H 1.48502 * 109.47221 * 89.99829 * 14 12 10 16 16 H 1.48496 * 109.47139 * 209.99650 * 14 12 10 17 17 H 1.48496 * 109.46998 * 329.99892 * 14 12 10 18 18 C 1.46503 * 119.99487 * 184.73879 * 8 6 4 19 19 C 1.52995 * 109.47439 * 269.99879 * 18 8 6 20 20 N 1.46903 * 109.47420 * 179.97438 * 19 18 8 21 21 C 1.47006 * 110.99879 * 293.63868 * 20 19 18 22 22 C 1.53102 * 109.25783 * 177.60377 * 21 20 19 23 23 O 1.43019 * 109.25644 * 56.84603 * 22 21 20 24 24 C 1.43012 * 113.73926 * 301.33431 * 23 22 21 25 25 C 1.47012 * 110.99981 * 170.00369 * 20 19 18 26 26 C 1.52997 * 109.47072 * 100.80260 * 4 3 2 27 27 C 1.53007 * 117.49956 * 9.03432 * 26 4 3 28 28 C 1.52999 * 117.49908 * 300.37747 * 26 4 3 29 29 H 1.08995 * 109.47121 * 60.00166 * 1 2 3 30 30 H 1.08996 * 109.47153 * 180.02562 * 1 2 3 31 31 H 1.09004 * 109.46677 * 299.99951 * 1 2 3 32 32 H 1.09000 * 109.47150 * 240.00090 * 2 1 3 33 33 H 1.09003 * 109.46911 * 120.00014 * 2 1 3 34 34 H 1.08996 * 109.47288 * 28.48497 * 9 8 6 35 35 H 1.08999 * 109.47787 * 148.49220 * 9 8 6 36 36 H 0.97001 * 120.00027 * 180.02562 * 13 12 10 37 37 H 1.08999 * 109.47301 * 30.00354 * 18 8 6 38 38 H 1.09004 * 109.46831 * 150.00303 * 18 8 6 39 39 H 1.08999 * 109.47262 * 300.00499 * 19 18 8 40 40 H 1.09004 * 109.46763 * 60.00382 * 19 18 8 41 41 H 1.08996 * 109.51444 * 297.53811 * 21 20 19 42 42 H 1.09001 * 109.50866 * 57.67489 * 21 20 19 43 43 H 1.09000 * 109.50795 * 296.91890 * 22 21 20 44 44 H 1.08995 * 109.54834 * 176.80577 * 22 21 20 45 45 H 1.09005 * 109.50570 * 298.73010 * 24 23 22 46 46 H 1.09000 * 109.53805 * 178.62821 * 24 23 22 47 47 H 1.09008 * 109.50495 * 302.32299 * 25 20 19 48 48 H 1.08990 * 109.50965 * 62.41853 * 25 20 19 49 49 H 1.08996 * 115.55214 * 154.70846 * 26 4 3 50 50 H 1.09005 * 117.49769 * 0.02562 * 27 26 4 51 51 H 1.08995 * 117.49545 * 145.01710 * 27 26 4 52 52 H 1.08997 * 117.49992 * 214.97693 * 28 26 4 53 53 H 1.09001 * 117.49880 * 359.97438 * 28 26 4 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 8 2.0064 1.3472 0.0000 4 6 3.4298 1.4605 -0.0551 5 1 3.8815 0.5171 0.2518 6 6 3.8826 2.5592 0.8716 7 8 3.0676 3.3057 1.3709 8 7 5.1933 2.7123 1.1454 9 6 6.1864 1.8791 0.4630 10 6 6.4517 0.6418 1.2815 11 1 5.9321 0.4910 2.2161 12 6 7.3576 -0.2977 0.8369 13 7 7.9900 -0.1143 -0.3015 14 14 7.6858 -1.8317 1.8511 15 1 6.7467 -2.9065 1.4410 16 1 9.0827 -2.2833 1.6277 17 1 7.4889 -1.5249 3.2906 18 6 5.6250 3.7121 2.1254 19 6 5.8797 5.0440 1.4169 20 7 6.3119 6.0467 2.3997 21 6 5.2288 6.3611 3.3427 22 6 5.7393 7.3622 4.3825 23 8 6.2306 8.5272 3.7141 24 6 7.2869 8.2575 2.7884 25 6 6.7919 7.2656 1.7326 26 6 3.8602 1.7903 -1.4858 27 6 2.7612 2.1402 -2.4912 28 6 3.4837 0.7940 -2.5842 29 1 -0.3633 0.5138 -0.8900 30 1 -0.3633 -1.0276 0.0005 31 1 -0.3633 0.5139 0.8900 32 1 1.8934 -0.5138 -0.8900 33 1 1.8934 -0.5139 0.8900 34 1 5.8074 1.5917 -0.5177 35 1 7.1126 2.4414 0.3441 36 1 8.6271 -0.7755 -0.6144 37 1 4.8469 3.8434 2.8773 38 1 6.5430 3.3757 2.6074 39 1 6.6578 4.9127 0.6650 40 1 4.9617 5.3804 0.9349 41 1 4.3890 6.7958 2.8007 42 1 4.9062 5.4485 3.8439 43 1 6.5440 6.9080 4.9607 44 1 4.9245 7.6421 5.0501 45 1 8.1365 7.8293 3.3204 46 1 7.5914 9.1845 2.3026 47 1 7.6105 7.0131 1.0584 48 1 5.9774 7.7143 1.1642 49 1 4.8140 2.3088 -1.5821 50 1 1.7316 2.1359 -2.1332 51 1 2.9922 2.8888 -3.2491 52 1 4.1897 0.6574 -3.4033 53 1 2.9298 -0.0967 -2.2875 RHF calculation, no. of doubly occupied orbitals= 66 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 ZINC000599230239.mol2 53 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 06:10:25 Heat of formation + Delta-G solvation = -87.692317 kcal Electronic energy + Delta-G solvation = -31778.716592 eV Core-core repulsion = 27651.951709 eV Total energy + Delta-G solvation = -4126.764883 eV No. of doubly occupied orbitals = 66 Molecular weight (most abundant/longest-lived isotopes) = 340.220 amu Computer time = 1.34 seconds Orbital eigenvalues (eV) -39.89265 -39.42302 -37.82500 -36.03711 -35.69142 -34.73711 -32.64684 -31.32609 -31.19068 -30.03152 -27.62166 -27.29228 -25.44138 -24.03099 -23.12489 -22.86183 -22.04012 -21.76845 -20.55387 -20.32753 -18.68933 -16.91925 -16.59720 -16.44900 -16.34410 -16.11738 -15.83067 -15.27553 -15.08406 -14.89394 -14.68548 -14.54734 -14.49958 -14.30270 -13.64115 -13.44813 -13.00591 -12.80635 -12.56726 -12.41319 -12.34857 -12.24764 -11.98984 -11.87353 -11.58254 -11.41245 -11.34336 -11.25159 -11.07699 -11.01403 -10.90934 -10.73534 -10.67156 -10.40404 -10.25448 -10.06453 -9.87861 -9.78006 -9.63060 -9.37732 -8.74339 -8.55890 -8.33524 -7.77391 -6.23402 -4.30627 3.18023 3.25886 3.27308 3.30516 3.37724 3.76542 3.91374 4.21778 4.26569 4.43249 4.85730 4.98873 5.00909 5.02873 5.08611 5.10815 5.13195 5.26586 5.27331 5.29136 5.38315 5.42568 5.50438 5.52619 5.56534 5.60370 5.64518 5.72178 5.77203 5.84534 5.87486 5.92886 5.96574 5.96938 5.98418 6.04864 6.20387 6.24638 6.26484 6.43204 6.43952 6.54431 6.69895 6.99317 7.03243 7.10594 7.13541 7.38598 7.57695 7.70475 7.99927 8.27012 8.73943 8.97284 9.37215 10.83092 Molecular weight = 340.22amu Principal moments of inertia in cm(-1) A = 0.008246 B = 0.003893 C = 0.003057 Principal moments of inertia in units of 10**(-40)*gram-cm**2 A = 3394.719282 B = 7190.801783 C = 9157.882914 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 0.050 3.950 3 O -0.358 6.358 4 C 0.108 3.892 5 H 0.105 0.895 6 C 0.521 3.479 7 O -0.554 6.554 8 N -0.593 5.593 9 C 0.224 3.776 10 C -0.540 4.540 11 H 0.060 0.940 12 C 0.068 3.932 13 N -0.888 5.888 14 Si 0.893 3.107 15 H -0.279 1.279 16 H -0.285 1.285 17 H -0.273 1.273 18 C 0.128 3.872 19 C 0.044 3.956 20 N -0.533 5.533 21 C 0.015 3.985 22 C 0.065 3.935 23 O -0.390 6.390 24 C 0.065 3.935 25 C 0.018 3.982 26 C -0.164 4.164 27 C -0.169 4.169 28 C -0.173 4.173 29 H 0.060 0.940 30 H 0.067 0.933 31 H 0.062 0.938 32 H 0.050 0.950 33 H 0.049 0.951 34 H 0.053 0.947 35 H 0.036 0.964 36 H 0.265 0.735 37 H 0.070 0.930 38 H 0.087 0.913 39 H 0.078 0.922 40 H 0.037 0.963 41 H 0.043 0.957 42 H 0.091 0.909 43 H 0.060 0.940 44 H 0.096 0.904 45 H 0.060 0.940 46 H 0.095 0.905 47 H 0.086 0.914 48 H 0.040 0.960 49 H 0.122 0.878 50 H 0.102 0.898 51 H 0.087 0.913 52 H 0.094 0.906 53 H 0.091 0.909 For the charges calculated by CM2: Dipole moment (debyes) X Y Z Total from point charges -5.462 7.109 0.127 8.966 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 -0.027 4.027 3 O -0.276 6.276 4 C 0.047 3.953 5 H 0.122 0.878 6 C 0.308 3.692 7 O -0.433 6.433 8 N -0.325 5.325 9 C 0.104 3.896 10 C -0.579 4.579 11 H 0.078 0.922 12 C -0.135 4.135 13 N -0.526 5.526 14 Si 0.721 3.279 15 H -0.205 1.205 16 H -0.210 1.210 17 H -0.198 1.198 18 C 0.004 3.996 19 C -0.085 4.085 20 N -0.259 5.259 21 C -0.113 4.113 22 C -0.012 4.012 23 O -0.308 6.308 24 C -0.012 4.012 25 C -0.110 4.110 26 C -0.182 4.182 27 C -0.206 4.206 28 C -0.210 4.210 29 H 0.079 0.921 30 H 0.086 0.914 31 H 0.081 0.919 32 H 0.069 0.931 33 H 0.067 0.933 34 H 0.071 0.929 35 H 0.054 0.946 36 H 0.075 0.925 37 H 0.088 0.912 38 H 0.106 0.894 39 H 0.096 0.904 40 H 0.056 0.944 41 H 0.061 0.939 42 H 0.109 0.891 43 H 0.078 0.922 44 H 0.114 0.886 45 H 0.078 0.922 46 H 0.113 0.887 47 H 0.104 0.896 48 H 0.059 0.941 49 H 0.140 0.860 50 H 0.120 0.880 51 H 0.106 0.894 52 H 0.113 0.887 53 H 0.109 0.891 Dipole moment (debyes) X Y Z Total from point charges -5.543 7.549 0.569 9.383 hybrid contribution 0.125 -1.265 -0.146 1.279 sum -5.418 6.284 0.423 8.308 Atomic orbital electron populations 1.21708 0.93966 1.01783 1.02989 1.22660 0.95328 0.84389 1.00318 1.87952 1.19569 1.25563 1.94565 1.21315 0.81908 0.99330 0.92746 0.87762 1.20241 0.82440 0.84829 0.81717 1.90595 1.53245 1.45796 1.53700 1.48125 1.06332 1.36518 1.41545 1.19760 0.87006 0.89391 0.93431 1.21471 1.24529 1.04548 1.07317 0.92158 1.24907 0.95346 0.98266 0.95024 1.69909 1.26897 1.35748 1.20054 0.86561 0.77668 0.82970 0.80705 1.20512 1.21016 1.19762 1.21171 1.00895 0.86471 0.91018 1.22512 0.99504 0.92228 0.94212 1.62146 1.35507 1.09893 1.18306 1.22837 0.92954 1.00092 0.95443 1.22684 0.99005 0.85735 0.93819 1.87950 1.53537 1.31928 1.57400 1.22648 0.89847 0.98488 0.90217 1.22765 1.00483 0.90943 0.96840 1.22749 1.00247 1.05177 0.90035 1.22912 0.98334 0.98189 1.01175 1.22970 1.03509 0.93540 1.00939 0.92058 0.91408 0.91888 0.93146 0.93278 0.92922 0.94557 0.92501 0.91213 0.89443 0.90399 0.94432 0.93886 0.89103 0.92210 0.88615 0.92208 0.88699 0.89563 0.94146 0.86006 0.87961 0.89419 0.88707 0.89088 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 -1.75 10.28 37.16 0.38 -1.37 16 2 C 0.05 0.73 6.29 37.16 0.23 0.96 16 3 O -0.36 -6.55 7.90 -54.93 -0.43 -6.98 16 4 C 0.11 2.08 2.19 -27.88 -0.06 2.02 16 5 H 0.10 2.12 7.01 -51.93 -0.36 1.76 16 6 C 0.52 11.09 7.03 -10.98 -0.08 11.02 16 7 O -0.55 -13.00 16.16 -14.13 -0.23 -13.23 16 8 N -0.59 -12.23 2.46 -175.06 -0.43 -12.66 16 9 C 0.22 5.05 4.66 -5.19 -0.02 5.03 16 10 C -0.54 -13.48 8.93 -34.44 -0.31 -13.79 16 11 H 0.06 1.54 7.81 -52.49 -0.41 1.13 16 12 C 0.07 1.73 5.46 -17.82 -0.10 1.63 16 13 N -0.89 -23.47 13.29 55.43 0.74 -22.74 16 14 Si 0.89 19.95 29.54 -169.99 -5.02 14.93 16 15 H -0.28 -6.17 7.11 56.52 0.40 -5.77 16 16 H -0.28 -6.35 7.11 56.52 0.40 -5.95 16 17 H -0.27 -6.11 7.11 56.52 0.40 -5.70 16 18 C 0.13 2.38 5.32 -4.04 -0.02 2.35 16 19 C 0.04 0.73 5.28 -3.82 -0.02 0.71 16 20 N -0.53 -7.73 4.73 -234.32 -1.11 -8.84 16 21 C 0.01 0.20 5.44 -3.71 -0.02 0.18 16 22 C 0.06 0.76 7.01 37.21 0.26 1.02 16 23 O -0.39 -5.07 10.83 -35.23 -0.38 -5.45 16 24 C 0.07 0.72 7.01 37.21 0.26 0.98 16 25 C 0.02 0.23 5.64 -3.71 -0.02 0.21 16 26 C -0.16 -2.86 4.57 -90.62 -0.41 -3.27 16 27 C -0.17 -2.55 9.88 -26.69 -0.26 -2.81 16 28 C -0.17 -2.59 10.07 -26.70 -0.27 -2.86 16 29 H 0.06 0.70 8.14 -51.93 -0.42 0.28 16 30 H 0.07 0.65 8.14 -51.93 -0.42 0.23 16 31 H 0.06 0.78 8.14 -51.93 -0.42 0.36 16 32 H 0.05 0.68 5.85 -51.93 -0.30 0.38 16 33 H 0.05 0.73 8.14 -51.93 -0.42 0.30 16 34 H 0.05 1.20 4.24 -51.93 -0.22 0.98 16 35 H 0.04 0.87 8.08 -51.93 -0.42 0.45 16 36 H 0.27 6.72 8.31 -40.82 -0.34 6.38 16 37 H 0.07 1.31 5.87 -51.93 -0.30 1.01 16 38 H 0.09 1.66 8.07 -51.93 -0.42 1.24 16 39 H 0.08 1.29 8.04 -51.93 -0.42 0.87 16 40 H 0.04 0.67 8.12 -51.93 -0.42 0.25 16 41 H 0.04 0.63 8.14 -51.93 -0.42 0.21 16 42 H 0.09 1.26 6.38 -51.93 -0.33 0.93 16 43 H 0.06 0.68 8.14 -51.93 -0.42 0.26 16 44 H 0.10 0.95 8.14 -51.93 -0.42 0.53 16 45 H 0.06 0.65 8.14 -51.93 -0.42 0.22 16 46 H 0.09 0.85 8.14 -51.93 -0.42 0.43 16 47 H 0.09 0.99 8.09 -51.92 -0.42 0.57 16 48 H 0.04 0.52 8.14 -51.93 -0.42 0.10 16 49 H 0.12 2.25 6.19 -51.93 -0.32 1.93 16 50 H 0.10 1.58 7.07 -51.93 -0.37 1.21 16 51 H 0.09 1.19 8.14 -51.93 -0.42 0.77 16 52 H 0.09 1.34 8.14 -51.93 -0.42 0.92 16 53 H 0.09 1.30 5.88 -51.93 -0.31 0.99 16 LS Contribution 413.96 15.07 6.24 6.24 Total: -1.00 -29.13 413.96 -10.32 -39.45 By element: Atomic # 1 Polarization: 16.49 SS G_CDS: -9.23 Total: 7.26 kcal Atomic # 6 Polarization: 2.47 SS G_CDS: -0.46 Total: 2.02 kcal Atomic # 7 Polarization: -43.43 SS G_CDS: -0.80 Total: -44.23 kcal Atomic # 8 Polarization: -24.62 SS G_CDS: -1.04 Total: -25.66 kcal Atomic # 14 Polarization: 19.95 SS G_CDS: -5.02 Total: 14.93 kcal Total LS contribution 6.24 Total: 6.24 kcal Total: -29.13 -10.32 -39.45 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. ZINC000599230239.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 -48.245 kcal (2) G-P(sol) polarization free energy of solvation -29.128 kcal (3) G-ENP(sol) elect.-nuc.-pol. free energy of system -77.372 kcal (4) G-CDS(sol) cavity-dispersion-solvent structure free energy -10.320 kcal (5) G-P-CDS(sol) = G-P(sol) + G-CDS(sol) = (2) + (4) -39.447 kcal (6) G-S(sol) free energy of system = (1) + (5) -87.692 kcal 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED Total computer time = 1.35 seconds