Wall clock time and date at job start Sat Apr 11 2020 06:14:07 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 1.52995 * 1 3 3 N 1.46900 * 109.47629 * 2 1 4 4 C 1.46905 * 110.99791 * 291.73518 * 3 2 1 5 5 C 1.50695 * 109.47099 * 289.06041 * 4 3 2 6 6 O 1.21291 * 120.00297 * 354.56159 * 5 4 3 7 7 N 1.34776 * 119.99831 * 174.55794 * 5 4 3 8 8 C 1.37095 * 120.00159 * 180.02562 * 7 5 4 9 9 H 1.08004 * 119.99900 * 0.02562 * 8 7 5 10 10 C 1.38950 * 120.00504 * 179.97438 * 8 7 5 11 11 N 1.31413 * 119.99711 * 0.02562 * 10 8 7 12 12 Si 1.86801 * 120.00216 * 179.97438 * 10 8 7 13 13 H 1.48503 * 109.47089 * 0.02562 * 12 10 8 14 14 H 1.48502 * 109.46851 * 120.00365 * 12 10 8 15 15 H 1.48500 * 109.47088 * 240.00302 * 12 10 8 16 16 C 1.46901 * 110.99549 * 55.68593 * 3 2 1 17 17 H 1.08996 * 109.47271 * 291.58848 * 16 3 2 18 18 C 1.53006 * 109.46965 * 171.59154 * 16 3 2 19 19 C 1.52998 * 109.47180 * 51.59663 * 16 3 2 20 20 N 1.46497 * 109.47673 * 55.91901 * 19 16 3 21 21 C 1.34774 * 120.00202 * 174.87767 * 20 19 16 22 22 O 1.21271 * 120.00094 * 0.27488 * 21 20 19 23 23 C 1.50703 * 119.99631 * 180.27466 * 21 20 19 24 24 H 1.08998 * 110.64854 * 300.70036 * 23 21 20 25 25 C 1.54599 * 110.71941 * 177.54934 * 23 21 20 26 26 C 1.53994 * 105.13820 * 219.68426 * 25 23 21 27 27 N 1.47896 * 107.05735 * 358.77576 * 26 25 23 28 28 C 1.46901 * 110.99962 * 145.84497 * 27 26 25 29 29 C 1.48731 * 105.94714 * 25.20474 * 27 26 25 30 30 H 1.08993 * 109.47680 * 182.19075 * 1 2 3 31 31 H 1.09004 * 109.47162 * 302.19301 * 1 2 3 32 32 H 1.09009 * 109.47553 * 62.18733 * 1 2 3 33 33 H 1.09000 * 109.46887 * 239.99934 * 2 1 3 34 34 H 1.08999 * 109.47230 * 120.00388 * 2 1 3 35 35 H 1.09002 * 109.46866 * 49.06592 * 4 3 2 36 36 H 1.09003 * 109.46623 * 169.05894 * 4 3 2 37 37 H 0.97003 * 119.99843 * 0.02562 * 7 5 4 38 38 H 0.96996 * 120.00055 * 180.02562 * 11 10 8 39 39 H 1.09005 * 109.46932 * 300.00191 * 18 16 3 40 40 H 1.09003 * 109.46672 * 59.99995 * 18 16 3 41 41 H 1.08992 * 109.47187 * 179.97438 * 18 16 3 42 42 H 1.09005 * 109.46432 * 295.91619 * 19 16 3 43 43 H 1.09004 * 109.47094 * 175.92154 * 19 16 3 44 44 H 0.97001 * 119.99326 * 355.14950 * 20 19 16 45 45 H 1.08997 * 110.31229 * 338.60287 * 25 23 21 46 46 H 1.09000 * 110.30923 * 100.77369 * 25 23 21 47 47 H 1.09001 * 109.91376 * 118.12929 * 26 25 23 48 48 H 1.08999 * 109.91604 * 239.22319 * 26 25 23 49 49 H 1.08998 * 109.47329 * 60.12486 * 28 27 26 50 50 H 1.09004 * 109.47387 * 180.12999 * 28 27 26 51 51 H 1.09007 * 109.47208 * 300.12529 * 28 27 26 52 52 H 1.09005 * 110.83843 * 202.57590 * 29 27 26 53 53 H 1.08993 * 110.58590 * 79.37814 * 29 27 26 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 1.5299 0.0000 0.0000 3 7 2.0197 1.3849 0.0000 4 6 1.7164 2.0506 -1.2740 5 6 2.5863 1.4744 -2.3613 6 8 3.4483 0.6672 -2.0846 7 7 2.4063 1.8560 -3.6413 8 6 3.1973 1.3315 -4.6307 9 1 3.9643 0.6122 -4.3844 10 6 3.0115 1.7244 -5.9505 11 7 2.0778 2.5993 -6.2502 12 14 4.0897 1.0102 -7.2983 13 1 5.0579 0.0542 -6.7033 14 1 3.2398 0.3015 -8.2886 15 1 4.8282 2.1068 -7.9746 16 6 1.4663 2.1389 1.1328 17 1 0.3957 2.2812 0.9862 18 6 2.1544 3.5026 1.2226 19 6 1.7049 1.3611 2.4285 20 7 3.1360 1.0852 2.5762 21 6 3.5970 0.4985 3.6985 22 8 2.8264 0.1944 4.5842 23 6 5.0701 0.2205 3.8529 24 1 5.4235 -0.4330 3.0554 25 6 5.3678 -0.3971 5.2386 26 6 6.6838 0.2585 5.6967 27 7 7.1149 1.1689 4.6138 28 6 7.7827 2.3578 5.1601 29 6 5.8780 1.5424 3.8772 30 1 -0.3634 -1.0268 0.0393 31 1 -0.3634 0.5475 0.8697 32 1 -0.3634 0.4795 -0.9090 33 1 1.8932 -0.5138 -0.8900 34 1 1.8933 -0.5139 0.8899 35 1 0.6677 1.8928 -1.5257 36 1 1.9109 3.1191 -1.1809 37 1 1.7171 2.5018 -3.8626 38 1 1.9478 2.8733 -7.1716 39 1 3.2252 3.3603 1.3692 40 1 1.9845 4.0568 0.2995 41 1 1.7435 4.0622 2.0628 42 1 1.1552 0.4204 2.3939 43 1 1.3595 1.9527 3.2763 44 1 3.7524 1.3285 1.8677 45 1 4.5650 -0.1629 5.9376 46 1 5.4929 -1.4765 5.1527 47 1 6.5172 0.8245 6.6133 48 1 7.4409 -0.5071 5.8657 49 1 8.6615 2.0522 5.7279 50 1 8.0875 3.0113 4.3426 51 1 7.0947 2.8922 5.8152 52 1 6.1134 1.8680 2.8639 53 1 5.3314 2.3174 4.4143 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 ZINC001156883723.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 06:14:07 Heat of formation + Delta-G solvation = -58.352947 kcal Electronic energy + Delta-G solvation = -31025.214666 eV Core-core repulsion = 26932.014785 eV Total energy + Delta-G solvation = -4093.199881 eV No. of doubly occupied orbitals = 66 Molecular weight (most abundant/longest-lived isotopes) = 340.226 amu Computer time = 0.81 seconds Orbital eigenvalues (eV) -40.42594 -39.31230 -38.20146 -37.33002 -34.52973 -33.80902 -32.56185 -31.77343 -31.24920 -30.03637 -29.16717 -26.95428 -26.38836 -25.74087 -24.18769 -22.99744 -22.21475 -21.26478 -20.02315 -19.67880 -18.78640 -17.79789 -17.52921 -16.62792 -16.41374 -15.95061 -15.67905 -15.40409 -15.02353 -14.76829 -14.60855 -14.37182 -14.15225 -13.87892 -13.69379 -13.52910 -13.32038 -13.17092 -13.03437 -12.81999 -12.46748 -12.29461 -12.04035 -11.85290 -11.79251 -11.69799 -11.62568 -11.56994 -11.47119 -11.43241 -11.31125 -11.10778 -10.89130 -10.58676 -10.45050 -10.35095 -10.22578 -9.88858 -9.49010 -9.02740 -8.74588 -8.47138 -7.97483 -7.89942 -6.42294 -3.82882 2.58749 3.13164 3.15605 3.26329 3.33252 3.75902 3.90590 3.92182 4.22540 4.29083 4.37941 4.65618 4.73925 4.88182 4.92869 5.05646 5.08742 5.11458 5.14588 5.16922 5.25271 5.26068 5.33414 5.38462 5.40055 5.51919 5.55615 5.56390 5.57044 5.63094 5.65426 5.69449 5.76142 5.84397 5.86447 5.94176 5.96385 6.04814 6.19866 6.23283 6.31293 6.42864 6.51040 6.53265 6.67441 7.21714 7.32413 7.54861 7.56678 8.06407 8.21849 8.61698 9.18350 9.54851 10.06684 10.75622 Molecular weight = 340.23amu Principal moments of inertia in cm(-1) A = 0.012521 B = 0.002550 C = 0.002293 Principal moments of inertia in units of 10**(-40)*gram-cm**2 A = 2235.724808 B =10976.293499 C =12206.329276 Net atomic charges, atomic populations, and dipole contributions calculated with CM2 Atom NO. Type Charge No. of electrons 1 C -0.194 4.194 2 C 0.048 3.952 3 N -0.506 5.506 4 C 0.038 3.962 5 C 0.446 3.554 6 O -0.576 6.576 7 N -0.567 5.567 8 C -0.296 4.296 9 H 0.103 0.897 10 C 0.021 3.979 11 N -0.903 5.903 12 Si 0.928 3.072 13 H -0.268 1.268 14 H -0.282 1.282 15 H -0.282 1.282 16 C 0.062 3.938 17 H 0.058 0.942 18 C -0.146 4.146 19 C 0.127 3.873 20 N -0.710 5.710 21 C 0.520 3.480 22 O -0.551 6.551 23 C -0.115 4.115 24 H 0.113 0.887 25 C -0.117 4.117 26 C 0.035 3.965 27 N -0.521 5.521 28 C 0.015 3.985 29 C 0.047 3.953 30 H 0.059 0.941 31 H 0.053 0.947 32 H 0.057 0.943 33 H 0.092 0.908 34 H 0.072 0.928 35 H 0.051 0.949 36 H 0.091 0.909 37 H 0.391 0.609 38 H 0.270 0.730 39 H 0.064 0.936 40 H 0.062 0.938 41 H 0.058 0.942 42 H 0.068 0.932 43 H 0.070 0.930 44 H 0.414 0.586 45 H 0.086 0.914 46 H 0.076 0.924 47 H 0.045 0.955 48 H 0.081 0.919 49 H 0.069 0.931 50 H 0.071 0.929 51 H 0.028 0.972 52 H 0.093 0.907 53 H 0.049 0.951 For the charges calculated by CM2: Dipole moment (debyes) X Y Z Total from point charges 1.678 1.246 20.457 20.563 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 -0.253 4.253 2 C -0.079 4.079 3 N -0.230 5.230 4 C -0.093 4.093 5 C 0.231 3.769 6 O -0.459 6.459 7 N -0.204 5.204 8 C -0.426 4.426 9 H 0.121 0.879 10 C -0.180 4.180 11 N -0.545 5.545 12 Si 0.755 3.245 13 H -0.192 1.192 14 H -0.208 1.208 15 H -0.208 1.208 16 C -0.047 4.047 17 H 0.076 0.924 18 C -0.204 4.204 19 C 0.002 3.998 20 N -0.362 5.362 21 C 0.306 3.694 22 O -0.429 6.429 23 C -0.136 4.136 24 H 0.131 0.869 25 C -0.155 4.155 26 C -0.093 4.093 27 N -0.245 5.245 28 C -0.133 4.133 29 C -0.081 4.081 30 H 0.078 0.922 31 H 0.072 0.928 32 H 0.076 0.924 33 H 0.110 0.890 34 H 0.091 0.909 35 H 0.069 0.931 36 H 0.109 0.891 37 H 0.224 0.776 38 H 0.080 0.920 39 H 0.083 0.917 40 H 0.081 0.919 41 H 0.077 0.923 42 H 0.086 0.914 43 H 0.088 0.912 44 H 0.251 0.749 45 H 0.105 0.895 46 H 0.095 0.905 47 H 0.063 0.937 48 H 0.099 0.901 49 H 0.088 0.912 50 H 0.090 0.910 51 H 0.046 0.954 52 H 0.112 0.888 53 H 0.067 0.933 Dipole moment (debyes) X Y Z Total from point charges 2.561 0.313 20.796 20.956 hybrid contribution -1.207 0.726 -0.935 1.690 sum 1.354 1.039 19.861 19.935 Atomic orbital electron populations 1.22489 0.98942 1.02242 1.01632 1.22237 0.91838 0.89901 1.03952 1.61854 1.58415 1.01839 1.00866 1.21977 0.98102 0.99408 0.89819 1.19728 0.87512 0.86391 0.83270 1.90513 1.36415 1.36792 1.82188 1.41885 1.33320 1.40056 1.05150 1.19726 1.14250 1.22811 0.85787 0.87906 1.25248 0.97475 0.96822 0.98466 1.69617 1.32555 1.32143 1.20140 0.85826 0.79613 0.78748 0.80322 1.19213 1.20830 1.20780 1.21945 0.97928 0.94191 0.90609 0.92444 1.21890 1.01542 0.95101 1.01865 1.21422 0.82113 0.99803 0.96416 1.45932 1.09417 1.61176 1.19691 1.20371 0.90261 0.77024 0.81762 1.90662 1.58427 1.52595 1.41213 1.22225 0.91755 0.98881 1.00782 0.86936 1.22344 0.97122 1.00641 0.95412 1.22918 0.96778 0.96456 0.93148 1.64735 1.22497 1.14644 1.22609 1.22529 0.98937 0.92236 0.99626 1.23226 0.89611 0.94979 1.00284 0.92242 0.92808 0.92393 0.88952 0.90934 0.93100 0.89139 0.77617 0.91981 0.91689 0.91888 0.92328 0.91367 0.91186 0.74855 0.89536 0.90477 0.93658 0.90074 0.91190 0.90977 0.95384 0.88840 0.93263 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 -0.19 -2.42 9.00 37.16 0.33 -2.09 16 2 C 0.05 0.71 5.19 -3.83 -0.02 0.69 16 3 N -0.51 -7.24 3.61 -228.08 -0.82 -8.07 16 4 C 0.04 0.62 5.22 -4.98 -0.03 0.59 16 5 C 0.45 9.91 7.32 -10.99 -0.08 9.83 16 6 O -0.58 -14.66 14.65 5.55 0.08 -14.58 16 7 N -0.57 -13.86 5.29 -10.97 -0.06 -13.92 16 8 C -0.30 -8.05 9.68 -14.93 -0.14 -8.20 16 9 H 0.10 2.95 7.16 -52.48 -0.38 2.57 16 10 C 0.02 0.56 5.50 -17.47 -0.10 0.46 16 11 N -0.90 -24.22 13.05 55.50 0.72 -23.50 16 12 Si 0.93 20.79 29.55 -169.99 -5.02 15.77 16 13 H -0.27 -6.01 7.11 56.52 0.40 -5.60 16 14 H -0.28 -6.25 7.11 56.52 0.40 -5.85 16 15 H -0.28 -6.23 7.11 56.52 0.40 -5.83 16 16 C 0.06 0.69 1.68 -67.71 -0.11 0.58 16 17 H 0.06 0.61 6.69 -51.93 -0.35 0.26 16 18 C -0.15 -1.49 8.99 37.16 0.33 -1.16 16 19 C 0.13 1.42 4.41 -4.04 -0.02 1.40 16 20 N -0.71 -8.10 4.87 -60.30 -0.29 -8.39 16 21 C 0.52 6.41 7.14 -10.99 -0.08 6.33 16 22 O -0.55 -8.48 15.45 5.56 0.09 -8.39 16 23 C -0.11 -1.18 3.44 -89.91 -0.31 -1.49 16 24 H 0.11 1.15 8.14 -51.93 -0.42 0.73 16 25 C -0.12 -1.14 6.32 -25.37 -0.16 -1.30 16 26 C 0.03 0.31 6.70 -2.76 -0.02 0.29 16 27 N -0.52 -4.98 5.55 -238.54 -1.32 -6.31 16 28 C 0.02 0.12 9.40 60.07 0.56 0.68 16 29 C 0.05 0.45 6.00 -1.79 -0.01 0.44 16 30 H 0.06 0.70 8.14 -51.93 -0.42 0.27 16 31 H 0.05 0.59 5.75 -51.93 -0.30 0.29 16 32 H 0.06 0.77 6.52 -51.92 -0.34 0.43 16 33 H 0.09 1.69 6.44 -51.93 -0.33 1.36 16 34 H 0.07 1.03 6.41 -51.93 -0.33 0.69 16 35 H 0.05 0.78 6.21 -51.93 -0.32 0.46 16 36 H 0.09 1.34 5.87 -51.93 -0.30 1.03 16 37 H 0.39 9.20 7.90 -40.82 -0.32 8.88 16 38 H 0.27 6.87 8.31 -40.82 -0.34 6.53 16 39 H 0.06 0.69 7.23 -51.93 -0.38 0.31 16 40 H 0.06 0.67 6.24 -51.93 -0.32 0.34 16 41 H 0.06 0.51 8.14 -51.93 -0.42 0.08 16 42 H 0.07 0.82 5.93 -51.93 -0.31 0.51 16 43 H 0.07 0.76 8.14 -51.93 -0.42 0.34 16 44 H 0.41 4.79 7.38 -40.82 -0.30 4.49 16 45 H 0.09 0.96 6.88 -51.93 -0.36 0.60 16 46 H 0.08 0.70 8.14 -51.93 -0.42 0.27 16 47 H 0.05 0.37 7.73 -51.93 -0.40 -0.03 16 48 H 0.08 0.65 8.14 -51.93 -0.42 0.22 16 49 H 0.07 0.48 8.14 -51.93 -0.42 0.06 16 50 H 0.07 0.53 8.14 -51.93 -0.42 0.11 16 51 H 0.03 0.21 8.01 -51.92 -0.42 -0.21 16 52 H 0.09 0.86 8.14 -51.93 -0.42 0.44 16 53 H 0.05 0.47 7.87 -51.93 -0.41 0.07 16 LS Contribution 407.14 15.07 6.14 6.14 Total: -1.00 -31.19 407.14 -9.15 -40.33 By element: Atomic # 1 Polarization: 22.66 SS G_CDS: -8.81 Total: 13.85 kcal Atomic # 6 Polarization: 6.90 SS G_CDS: 0.16 Total: 7.06 kcal Atomic # 7 Polarization: -58.41 SS G_CDS: -1.77 Total: -60.18 kcal Atomic # 8 Polarization: -23.14 SS G_CDS: 0.17 Total: -22.97 kcal Atomic # 14 Polarization: 20.79 SS G_CDS: -5.02 Total: 15.77 kcal Total LS contribution 6.14 Total: 6.14 kcal Total: -31.19 -9.15 -40.33 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. ZINC001156883723.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 -18.019 kcal (2) G-P(sol) polarization free energy of solvation -31.188 kcal (3) G-ENP(sol) elect.-nuc.-pol. free energy of system -49.206 kcal (4) G-CDS(sol) cavity-dispersion-solvent structure free energy -9.146 kcal (5) G-P-CDS(sol) = G-P(sol) + G-CDS(sol) = (2) + (4) -40.334 kcal (6) G-S(sol) free energy of system = (1) + (5) -58.353 kcal 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED Total computer time = 0.81 seconds