Wall clock time and date at job start Wed Apr 1 2020 06:44:53 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 1.52997 * 1 3 3 C 1.53006 * 109.47127 * 2 1 4 4 C 1.52992 * 109.47482 * 239.99653 * 2 1 3 5 5 C 1.53002 * 109.47278 * 295.00291 * 4 2 1 6 6 C 1.52997 * 109.47192 * 179.97438 * 5 4 2 7 7 C 1.50697 * 109.47173 * 179.97438 * 6 5 4 8 8 O 1.21287 * 119.99913 * 0.02562 * 7 6 5 9 9 N 1.34781 * 120.00428 * 179.97438 * 7 6 5 10 10 C 1.46497 * 120.00036 * 180.02562 * 9 7 6 11 11 H 1.08997 * 110.41597 * 34.30002 * 10 9 7 12 12 C 1.54739 * 110.46363 * 156.79025 * 10 9 7 13 13 C 1.53712 * 101.40427 * 142.93798 * 12 10 9 14 14 C 1.53038 * 115.17691 * 105.40262 * 13 12 10 15 15 N 1.47761 * 85.81968 * 93.69230 * 14 13 12 16 16 C 1.36933 * 134.41143 * 204.00238 * 15 14 13 17 17 H 1.07999 * 119.99845 * 179.97438 * 16 15 14 18 18 C 1.38815 * 120.00223 * 359.95406 * 16 15 14 19 19 N 1.31622 * 119.99941 * 0.02562 * 18 16 15 20 20 Si 1.86796 * 120.00184 * 179.97438 * 18 16 15 21 21 H 1.48492 * 109.47327 * 59.99814 * 20 18 16 22 22 H 1.48502 * 109.47164 * 180.02562 * 20 18 16 23 23 H 1.48502 * 109.47103 * 300.00000 * 20 18 16 24 24 C 1.47758 * 91.17398 * 23.96907 * 15 14 13 25 25 N 1.46165 * 106.70366 * 335.23149 * 13 12 10 26 26 C 1.37266 * 142.21995 * 196.36438 * 25 13 12 27 27 C 1.34527 * 106.91081 * 179.97438 * 26 25 13 28 28 N 1.33975 * 108.04966 * 0.02562 * 27 26 25 29 29 C 1.30854 * 109.35037 * 0.03381 * 28 27 26 30 30 H 1.09002 * 109.47153 * 180.02562 * 1 2 3 31 31 H 1.09001 * 109.46832 * 60.00321 * 1 2 3 32 32 H 1.09004 * 109.47261 * 300.00303 * 1 2 3 33 33 H 1.08998 * 109.47533 * 119.99499 * 2 1 3 34 34 H 1.08993 * 109.46955 * 60.00011 * 3 2 1 35 35 H 1.09000 * 109.47050 * 179.97438 * 3 2 1 36 36 H 1.09001 * 109.47002 * 299.99574 * 3 2 1 37 37 H 1.09002 * 109.46906 * 55.00224 * 4 2 1 38 38 H 1.09006 * 109.47717 * 174.99599 * 4 2 1 39 39 H 1.09000 * 109.46593 * 299.99796 * 5 4 2 40 40 H 1.08998 * 109.46891 * 59.99794 * 5 4 2 41 41 H 1.09000 * 109.47459 * 299.99601 * 6 5 4 42 42 H 1.09006 * 109.47396 * 60.00284 * 6 5 4 43 43 H 0.96996 * 119.99210 * 0.02562 * 9 7 6 44 44 H 1.09002 * 111.01674 * 261.07573 * 12 10 9 45 45 H 1.09001 * 111.01695 * 24.96485 * 12 10 9 46 46 H 1.09001 * 113.81841 * 207.91351 * 14 13 12 47 47 H 1.09002 * 113.81648 * 339.47133 * 14 13 12 48 48 H 0.96994 * 119.99911 * 180.02562 * 19 18 16 49 49 H 1.08993 * 113.81597 * 221.79010 * 24 15 14 50 50 H 1.09003 * 113.81291 * 90.25200 * 24 15 14 51 51 H 1.07995 * 126.54549 * 359.91636 * 26 25 13 52 52 H 1.08006 * 125.97305 * 179.97438 * 27 26 25 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 2.0400 1.4426 0.0000 4 6 2.0400 -0.7213 -1.2491 5 6 1.6353 -2.1955 -1.1878 6 6 2.1448 -2.9166 -2.4373 7 6 1.7467 -4.3688 -2.3766 8 8 1.1169 -4.7858 -1.4277 9 7 2.0895 -5.2040 -3.3774 10 6 1.7019 -6.6156 -3.3186 11 1 0.7325 -6.7238 -2.8322 12 6 1.6653 -7.2262 -4.7399 13 6 2.2024 -8.6421 -4.4764 14 6 1.1504 -9.7532 -4.5047 15 7 1.5216 -9.9202 -5.9251 16 6 0.8853 -10.4209 -7.0294 17 1 1.3890 -10.4309 -7.9847 18 6 -0.4070 -10.9160 -6.9210 19 7 -1.0209 -10.9037 -5.7568 20 14 -1.2753 -11.5984 -8.4275 21 1 -0.4981 -12.7406 -8.9719 22 1 -2.6350 -12.0600 -8.0486 23 1 -1.3835 -10.5364 -9.4599 24 6 2.8536 -9.3302 -5.6779 25 7 3.0162 -8.5639 -3.2649 26 6 3.9710 -9.2468 -2.5533 27 6 4.2585 -8.5028 -1.4700 28 7 3.5034 -7.3970 -1.5137 29 6 2.7543 -7.4255 -2.5862 30 1 -0.3633 -1.0277 0.0005 31 1 -0.3633 0.5138 -0.8900 32 1 -0.3634 0.5139 0.8900 33 1 1.8934 -0.5137 0.8900 34 1 1.6767 1.9563 0.8899 35 1 3.1300 1.4425 0.0005 36 1 1.6767 1.9564 -0.8900 37 1 1.6055 -0.2618 -2.1369 38 1 3.1264 -0.6443 -1.2951 39 1 2.0699 -2.6549 -0.3001 40 1 0.5490 -2.2724 -1.1420 41 1 1.7099 -2.4571 -3.3248 42 1 3.2312 -2.8398 -2.4836 43 1 2.5928 -4.8704 -4.1364 44 1 0.6463 -7.2578 -5.1257 45 1 2.3213 -6.6794 -5.4173 46 1 1.3998 -10.6115 -3.8808 47 1 0.1308 -9.3979 -4.3551 48 1 -1.9238 -11.2500 -5.6809 49 1 3.1808 -8.6408 -6.4560 50 1 3.6153 -10.0613 -5.4068 51 1 4.4074 -10.1999 -2.8131 52 1 4.9724 -8.7536 -0.6994 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 ZINC001101644203.mol2 52 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED SCF FIELD WAS ACHIEVED Wall clock time and date at job start Wed Apr 1 2020 06:44:53 Heat of formation + Delta-G solvation = 72.522993 kcal Electronic energy + Delta-G solvation = -30472.740461 eV Core-core repulsion = 26474.757176 eV Total energy + Delta-G solvation = -3997.983285 eV No. of doubly occupied orbitals = 66 Molecular weight (most abundant/longest-lived isotopes) = 346.211 amu Computer time = 1.15 seconds Orbital eigenvalues (eV) -42.25875 -39.61124 -38.57077 -37.22424 -35.48469 -33.38467 -32.94149 -31.80366 -30.61853 -28.16689 -27.83995 -27.41092 -26.97993 -25.36727 -24.39853 -22.57684 -22.04914 -21.21650 -20.40024 -20.18972 -19.71251 -18.67518 -17.21242 -17.01040 -16.29022 -16.03698 -15.81758 -15.15591 -14.97908 -14.72288 -14.40703 -14.27061 -14.07785 -14.03225 -13.66983 -13.57418 -13.37542 -13.26489 -12.88711 -12.54114 -12.48092 -12.22758 -12.13483 -11.91221 -11.82400 -11.78705 -11.55075 -11.17679 -11.13583 -11.03852 -10.92278 -10.86750 -10.80579 -10.60668 -10.59396 -10.25088 -9.81397 -9.73703 -9.51690 -9.16520 -9.02164 -8.98756 -8.03424 -7.18802 -5.98174 -3.33942 2.35706 2.73863 2.98495 3.21435 3.28327 3.33946 3.34660 3.58560 4.13927 4.27373 4.47424 4.51366 4.60883 4.64030 4.79579 4.81819 4.93383 4.93800 4.97383 5.08163 5.29064 5.33206 5.34221 5.38134 5.38626 5.44327 5.52169 5.53517 5.62640 5.64398 5.65825 5.72257 5.83601 5.90682 5.94078 5.96266 5.98762 6.02850 6.06706 6.16836 6.19489 6.20629 6.27163 6.44765 6.75191 6.81348 6.91518 7.19048 7.23827 7.46163 7.52819 7.72843 8.31809 8.50756 8.80959 9.47536 10.27919 11.18550 Molecular weight = 346.21amu Principal moments of inertia in cm(-1) A = 0.014055 B = 0.002242 C = 0.002026 Principal moments of inertia in units of 10**(-40)*gram-cm**2 A = 1991.722951 B =12484.804634 C =13819.548295 Net atomic charges, atomic populations, and dipole contributions calculated with CM2 Atom NO. Type Charge No. of electrons 1 C -0.151 4.151 2 C -0.098 4.098 3 C -0.147 4.147 4 C -0.115 4.115 5 C -0.106 4.106 6 C -0.138 4.138 7 C 0.516 3.484 8 O -0.526 6.526 9 N -0.719 5.719 10 C 0.230 3.770 11 H 0.117 0.883 12 C -0.094 4.094 13 C 0.101 3.899 14 C 0.171 3.829 15 N -0.599 5.599 16 C -0.232 4.232 17 H 0.084 0.916 18 C -0.001 4.001 19 N -0.918 5.918 20 Si 0.917 3.083 21 H -0.284 1.284 22 H -0.288 1.288 23 H -0.282 1.282 24 C 0.125 3.875 25 N -0.452 5.452 26 C -0.027 4.027 27 C -0.037 4.037 28 N -0.473 5.473 29 C 0.169 3.831 30 H 0.061 0.939 31 H 0.053 0.947 32 H 0.051 0.949 33 H 0.070 0.930 34 H 0.052 0.948 35 H 0.053 0.947 36 H 0.053 0.947 37 H 0.061 0.939 38 H 0.061 0.939 39 H 0.070 0.930 40 H 0.072 0.928 41 H 0.091 0.909 42 H 0.091 0.909 43 H 0.401 0.599 44 H 0.116 0.884 45 H 0.089 0.911 46 H 0.036 0.964 47 H 0.087 0.913 48 H 0.259 0.741 49 H 0.057 0.943 50 H 0.041 0.959 51 H 0.167 0.833 52 H 0.169 0.831 For the charges calculated by CM2: Dipole moment (debyes) X Y Z Total from point charges 7.973 18.883 5.876 21.323 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 -0.208 4.208 2 C -0.117 4.117 3 C -0.205 4.205 4 C -0.152 4.152 5 C -0.144 4.144 6 C -0.178 4.178 7 C 0.303 3.697 8 O -0.401 6.401 9 N -0.372 5.372 10 C 0.122 3.878 11 H 0.134 0.866 12 C -0.133 4.133 13 C 0.016 3.984 14 C 0.045 3.955 15 N -0.326 5.326 16 C -0.359 4.359 17 H 0.102 0.898 18 C -0.199 4.199 19 N -0.564 5.564 20 Si 0.746 3.254 21 H -0.210 1.210 22 H -0.214 1.214 23 H -0.208 1.208 24 C -0.002 4.002 25 N -0.134 5.134 26 C -0.161 4.161 27 C -0.186 4.186 28 N -0.191 5.191 29 C -0.096 4.096 30 H 0.080 0.920 31 H 0.072 0.928 32 H 0.070 0.930 33 H 0.089 0.911 34 H 0.071 0.929 35 H 0.072 0.928 36 H 0.072 0.928 37 H 0.080 0.920 38 H 0.080 0.920 39 H 0.089 0.911 40 H 0.091 0.909 41 H 0.110 0.890 42 H 0.110 0.890 43 H 0.235 0.765 44 H 0.134 0.866 45 H 0.107 0.893 46 H 0.053 0.947 47 H 0.105 0.895 48 H 0.069 0.931 49 H 0.075 0.925 50 H 0.059 0.941 51 H 0.184 0.816 52 H 0.186 0.814 Dipole moment (debyes) X Y Z Total from point charges 7.212 18.874 6.802 21.319 hybrid contribution 0.076 -1.403 -1.633 2.154 sum 7.288 17.471 5.169 19.623 Atomic orbital electron populations 1.21907 0.95237 1.02227 1.01424 1.21116 0.96039 0.95927 0.98606 1.21847 1.00834 0.96186 1.01593 1.21670 1.00729 0.95020 0.97808 1.21407 1.02131 0.93875 0.96984 1.21678 1.03037 0.91969 1.01165 1.20717 0.78947 0.88187 0.81892 1.90732 1.39141 1.77982 1.32281 1.45938 1.58603 1.08392 1.24225 1.19956 0.94823 0.78895 0.94104 0.86558 1.22609 1.04731 0.91786 0.94178 1.23798 0.93830 0.97935 0.82795 1.22506 0.96382 0.90918 0.85691 1.45770 1.09660 1.72586 1.04614 1.18923 0.95859 1.34881 0.86240 0.89804 1.24837 0.96989 1.00777 0.97298 1.69775 1.13587 1.50449 1.22553 0.86135 0.78782 0.78925 0.81513 1.21014 1.21382 1.20818 1.22704 0.90643 0.94406 0.92450 1.46565 1.28909 1.18020 1.19948 1.22342 0.96916 1.01023 0.95840 1.22218 1.04076 0.92822 0.99462 1.69782 1.08329 1.22966 1.18067 1.24545 1.01808 0.90729 0.92495 0.92041 0.92831 0.93021 0.91149 0.92879 0.92812 0.92803 0.91980 0.91996 0.91090 0.90909 0.89037 0.89036 0.76474 0.86568 0.89296 0.94656 0.89475 0.93124 0.92477 0.94146 0.81599 0.81419 Number of geometries 1 Number of calculations of the screened coulomb radii 1 The total number of SCF iterations 14. 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 -1.13 8.95 37.16 0.33 -0.80 16 2 C -0.10 -0.73 2.92 -90.62 -0.26 -0.99 16 3 C -0.15 -0.93 9.19 37.16 0.34 -0.59 16 4 C -0.11 -0.84 4.68 -26.73 -0.13 -0.97 16 5 C -0.11 -1.01 4.26 -26.73 -0.11 -1.12 16 6 C -0.14 -1.24 5.70 -27.89 -0.16 -1.40 16 7 C 0.52 6.86 7.83 -10.98 -0.09 6.78 16 8 O -0.53 -9.37 15.66 5.55 0.09 -9.28 16 9 N -0.72 -8.82 5.15 -53.58 -0.28 -9.09 16 10 C 0.23 3.51 3.25 -67.70 -0.22 3.29 16 11 H 0.12 1.97 7.61 -51.93 -0.40 1.58 16 12 C -0.09 -1.39 6.18 -25.45 -0.16 -1.55 16 13 C 0.10 1.79 1.56 -136.63 -0.21 1.58 16 14 C 0.17 3.79 6.94 -3.33 -0.02 3.77 16 15 N -0.60 -14.02 3.69 -182.66 -0.67 -14.70 16 16 C -0.23 -6.00 10.70 -15.06 -0.16 -6.16 16 17 H 0.08 2.08 7.83 -52.49 -0.41 1.67 16 18 C 0.00 -0.04 5.50 -17.43 -0.10 -0.13 16 19 N -0.92 -25.66 11.39 55.49 0.63 -25.03 16 20 Si 0.92 20.90 29.55 -169.99 -5.02 15.87 16 21 H -0.28 -6.42 7.11 56.52 0.40 -6.02 16 22 H -0.29 -6.68 7.11 56.52 0.40 -6.28 16 23 H -0.28 -6.27 7.11 56.52 0.40 -5.87 16 24 C 0.12 2.33 8.46 -3.35 -0.03 2.31 16 25 N -0.45 -7.87 3.37 -103.41 -0.35 -8.22 16 26 C -0.03 -0.44 12.03 -16.43 -0.20 -0.64 16 27 C -0.04 -0.60 11.86 -17.93 -0.21 -0.81 16 28 N -0.47 -8.93 11.25 -10.49 -0.12 -9.05 16 29 C 0.17 3.00 8.23 -154.60 -1.27 1.73 16 30 H 0.06 0.52 6.57 -51.93 -0.34 0.17 16 31 H 0.05 0.38 8.14 -51.93 -0.42 -0.05 16 32 H 0.05 0.36 8.14 -51.93 -0.42 -0.06 16 33 H 0.07 0.56 8.14 -51.93 -0.42 0.14 16 34 H 0.05 0.32 8.14 -51.93 -0.42 -0.10 16 35 H 0.05 0.32 8.14 -51.93 -0.42 -0.10 16 36 H 0.05 0.32 8.14 -51.93 -0.42 -0.10 16 37 H 0.06 0.42 8.14 -51.93 -0.42 -0.01 16 38 H 0.06 0.42 8.14 -51.93 -0.42 0.00 16 39 H 0.07 0.80 8.10 -51.93 -0.42 0.38 16 40 H 0.07 0.76 6.52 -51.93 -0.34 0.43 16 41 H 0.09 0.62 8.14 -51.93 -0.42 0.19 16 42 H 0.09 0.70 8.14 -51.93 -0.42 0.27 16 43 H 0.40 3.61 8.40 -40.82 -0.34 3.27 16 44 H 0.12 1.81 7.92 -51.93 -0.41 1.40 16 45 H 0.09 1.08 7.78 -51.93 -0.40 0.68 16 46 H 0.04 0.84 8.14 -51.93 -0.42 0.42 16 47 H 0.09 2.11 7.08 -51.93 -0.37 1.74 16 48 H 0.26 7.08 8.31 -40.82 -0.34 6.74 16 49 H 0.06 0.97 8.09 -51.93 -0.42 0.55 16 50 H 0.04 0.76 8.14 -51.93 -0.42 0.34 16 51 H 0.17 2.26 8.06 -52.49 -0.42 1.84 16 52 H 0.17 2.19 8.06 -52.48 -0.42 1.77 16 LS Contribution 417.67 15.07 6.29 6.29 Total: -1.00 -32.93 417.67 -10.99 -43.92 By element: Atomic # 1 Polarization: 13.89 SS G_CDS: -8.91 Total: 4.98 kcal Atomic # 6 Polarization: 6.95 SS G_CDS: -2.66 Total: 4.29 kcal Atomic # 7 Polarization: -65.30 SS G_CDS: -0.78 Total: -66.09 kcal Atomic # 8 Polarization: -9.37 SS G_CDS: 0.09 Total: -9.28 kcal Atomic # 14 Polarization: 20.90 SS G_CDS: -5.02 Total: 15.87 kcal Total LS contribution 6.29 Total: 6.29 kcal Total: -32.93 -10.99 -43.92 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. ZINC001101644203.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 116.447 kcal (2) G-P(sol) polarization free energy of solvation -32.934 kcal (3) G-ENP(sol) elect.-nuc.-pol. free energy of system 83.513 kcal (4) G-CDS(sol) cavity-dispersion-solvent structure free energy -10.990 kcal (5) G-P-CDS(sol) = G-P(sol) + G-CDS(sol) = (2) + (4) -43.924 kcal (6) G-S(sol) free energy of system = (1) + (5) 72.523 kcal 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED Total computer time = 1.15 seconds