Wall clock time and date at job start Sat Apr 11 2020 06:11:56 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 O 1.42899 * 1 3 3 C 1.42902 * 113.99698 * 2 1 4 4 O 1.42903 * 109.46914 * 75.00254 * 3 2 1 5 5 C 1.42900 * 114.00143 * 74.99991 * 4 3 2 6 6 C 1.53004 * 109.46864 * 179.97438 * 5 4 3 7 7 C 1.53004 * 109.46786 * 179.97438 * 6 5 4 8 8 N 1.46900 * 109.46734 * 179.97438 * 7 6 5 9 9 C 1.48144 * 110.99978 * 69.87601 * 8 7 6 10 10 C 1.54077 * 107.15191 * 144.30313 * 9 8 7 11 11 C 1.54809 * 105.20333 * 358.93342 * 10 9 8 12 12 C 1.47663 * 110.96101 * 187.22352 * 8 7 6 13 13 C 1.53439 * 111.70644 * 81.78387 * 12 8 7 14 14 C 1.54748 * 101.46362 * 214.04305 * 13 12 8 15 15 N 1.46904 * 105.52471 * 24.38188 * 14 13 12 16 16 C 1.46495 * 124.37943 * 163.21281 * 15 14 13 17 17 C 1.52998 * 109.47460 * 89.97413 * 16 15 14 18 18 C 1.50701 * 109.47351 * 180.02562 * 17 16 15 19 19 H 1.07999 * 119.99550 * 0.02562 * 18 17 16 20 20 C 1.37880 * 119.99886 * 180.02562 * 18 17 16 21 21 N 1.31517 * 119.99684 * 180.02562 * 20 18 17 22 22 Si 1.86800 * 119.99958 * 359.97438 * 20 18 17 23 23 H 1.48501 * 109.47322 * 90.00180 * 22 20 18 24 24 H 1.48501 * 109.46669 * 209.99939 * 22 20 18 25 25 H 1.48500 * 109.47247 * 329.99714 * 22 20 18 26 26 C 1.34818 * 111.24650 * 343.20762 * 15 14 13 27 27 O 1.21280 * 125.16703 * 181.11810 * 26 15 14 28 28 H 1.09000 * 109.47070 * 59.99595 * 1 2 3 29 29 H 1.09000 * 109.47566 * 180.02562 * 1 2 3 30 30 H 1.09007 * 109.47608 * 300.00383 * 1 2 3 31 31 H 1.08993 * 109.47568 * 314.99624 * 3 2 1 32 32 H 1.09004 * 109.46511 * 194.99772 * 3 2 1 33 33 H 1.08996 * 109.47148 * 59.99477 * 5 4 3 34 34 H 1.09001 * 109.46691 * 299.99374 * 5 4 3 35 35 H 1.08997 * 109.47176 * 59.99469 * 6 5 4 36 36 H 1.09001 * 109.47106 * 299.99303 * 6 5 4 37 37 H 1.08996 * 109.46943 * 59.99833 * 7 6 5 38 38 H 1.09001 * 109.46973 * 299.99683 * 7 6 5 39 39 H 1.08998 * 109.90075 * 24.91596 * 9 8 7 40 40 H 1.09001 * 109.90150 * 263.67988 * 9 8 7 41 41 H 1.09007 * 110.29519 * 240.00303 * 10 9 8 42 42 H 1.09000 * 110.38449 * 117.90927 * 10 9 8 43 43 H 1.09002 * 110.74934 * 97.54423 * 11 10 9 44 44 H 1.09002 * 110.75152 * 220.71796 * 11 10 9 45 45 H 1.09005 * 111.02782 * 332.08166 * 13 12 8 46 46 H 1.08993 * 111.02858 * 95.95812 * 13 12 8 47 47 H 1.08998 * 110.23887 * 143.39863 * 14 13 12 48 48 H 1.08999 * 110.23481 * 265.37111 * 14 13 12 49 49 H 1.08998 * 109.47391 * 209.97395 * 16 15 14 50 50 H 1.09007 * 109.47027 * 329.97526 * 16 15 14 51 51 H 1.09004 * 109.47200 * 300.00185 * 17 16 15 52 52 H 1.08998 * 109.46883 * 60.00141 * 17 16 15 53 53 H 0.96997 * 119.99651 * 180.02562 * 21 20 18 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 8 1.4290 0.0000 0.0000 3 6 2.0102 1.3055 0.0000 4 8 1.8853 1.8824 1.3014 5 6 2.7911 1.3426 2.2659 6 6 2.5697 2.0305 3.6145 7 6 3.5391 1.4520 4.6472 8 7 3.3270 2.1130 5.9419 9 6 2.0290 1.7150 6.5348 10 6 2.2316 1.6351 8.0601 11 6 3.7224 1.9833 8.2904 12 6 4.3569 1.7051 6.9183 13 6 5.6560 2.5017 6.7389 14 6 6.7205 1.4420 7.1112 15 7 6.0838 0.1414 6.8638 16 6 6.8101 -1.1247 6.7394 17 6 6.9405 -1.7755 8.1179 18 6 7.6882 -3.0777 7.9900 19 1 8.0359 -3.4079 7.0223 20 6 7.9282 -3.8475 9.1084 21 7 8.5811 -4.9837 8.9968 22 14 7.3274 -3.2760 10.7823 23 1 5.9582 -3.7986 11.0217 24 1 8.2422 -3.7835 11.8362 25 1 7.3043 -1.7916 10.8196 26 6 4.7448 0.2637 6.7662 27 8 3.9712 -0.6524 6.5835 28 1 -0.3633 0.5139 -0.8899 29 1 -0.3634 -1.0276 0.0005 30 1 -0.3634 0.5139 0.8900 31 1 1.4942 1.9330 -0.7266 32 1 3.0648 1.2336 -0.2660 33 1 3.8162 1.5115 1.9361 34 1 2.6148 0.2720 2.3704 35 1 1.5447 1.8620 3.9444 36 1 2.7463 3.1010 3.5096 37 1 4.5643 1.6203 4.3174 38 1 3.3622 0.3816 4.7520 39 1 1.7279 0.7411 6.1489 40 1 1.2696 2.4608 6.3000 41 1 2.0191 0.6275 8.4175 42 1 1.5919 2.3579 8.5664 43 1 3.8362 3.0326 8.5630 44 1 4.1561 1.3381 9.0544 45 1 5.7747 2.8290 5.7060 46 1 5.6921 3.3500 7.4223 47 1 7.6025 1.5560 6.4810 48 1 6.9930 1.5345 8.1625 49 1 6.2646 -1.7925 6.0726 50 1 7.8031 -0.9355 6.3315 51 1 7.4861 -1.1078 8.7848 52 1 5.9476 -1.9647 8.5258 53 1 8.7497 -5.5255 9.7836 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 ZINC001273466709.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 06:11:56 Heat of formation + Delta-G solvation = -125.114208 kcal Electronic energy + Delta-G solvation = -31177.355616 eV Core-core repulsion = 27048.967998 eV Total energy + Delta-G solvation = -4128.387618 eV No. of doubly occupied orbitals = 66 Molecular weight (most abundant/longest-lived isotopes) = 340.220 amu Computer time = 0.72 seconds Orbital eigenvalues (eV) -41.28879 -39.14564 -37.75597 -36.64733 -36.21283 -34.13125 -33.53685 -31.95039 -30.47700 -29.52834 -27.80235 -27.73411 -25.78089 -25.32842 -24.28654 -23.44847 -22.17391 -21.66987 -20.53093 -20.28043 -18.71549 -17.58780 -17.12064 -17.03738 -16.62053 -16.26614 -15.90430 -15.69195 -15.48897 -15.13599 -14.84996 -14.48074 -14.26030 -14.17835 -14.01468 -13.59993 -13.31715 -13.11893 -12.94295 -12.79103 -12.61991 -12.27708 -12.21390 -12.11245 -11.96562 -11.63287 -11.55651 -11.42090 -11.30145 -11.22125 -11.04786 -11.03146 -10.73205 -10.71579 -10.45793 -10.43194 -10.16589 -10.12395 -9.86673 -9.80530 -9.30903 -8.58430 -8.39112 -8.16606 -6.09322 -4.08455 2.76334 3.23486 3.28777 3.35441 3.37636 3.38344 3.49247 3.87682 4.33654 4.39751 4.41393 4.59767 4.71102 4.78710 4.83111 4.90944 4.96937 5.04189 5.05893 5.11428 5.12671 5.14930 5.18274 5.24913 5.27244 5.39980 5.44959 5.51047 5.59195 5.61723 5.66822 5.73728 5.79309 5.86529 5.88766 5.92559 5.93627 5.98749 6.06614 6.15723 6.26306 6.46932 6.55032 6.72300 6.76031 6.84717 6.94534 7.14014 7.27489 7.56154 7.71654 8.43222 8.49573 8.93481 9.52506 11.03767 Molecular weight = 340.22amu Principal moments of inertia in cm(-1) A = 0.011668 B = 0.002726 C = 0.002435 Principal moments of inertia in units of 10**(-40)*gram-cm**2 A = 2399.153943 B =10269.047533 C =11498.031403 Net atomic charges, atomic populations, and dipole contributions calculated with CM2 Atom NO. Type Charge No. of electrons 1 C 0.032 3.968 2 O -0.404 6.404 3 C 0.214 3.786 4 O -0.401 6.401 5 C 0.064 3.936 6 C -0.107 4.107 7 C 0.034 3.966 8 N -0.484 5.484 9 C 0.037 3.963 10 C -0.129 4.129 11 C -0.100 4.100 12 C 0.057 3.943 13 C -0.112 4.112 14 C 0.098 3.902 15 N -0.612 5.612 16 C 0.136 3.864 17 C -0.023 4.023 18 C -0.522 4.522 19 H 0.074 0.926 20 C 0.070 3.930 21 N -0.900 5.900 22 Si 0.881 3.119 23 H -0.277 1.277 24 H -0.287 1.287 25 H -0.267 1.267 26 C 0.502 3.498 27 O -0.525 6.525 28 H 0.041 0.959 29 H 0.084 0.916 30 H 0.049 0.951 31 H 0.090 0.910 32 H 0.090 0.910 33 H 0.051 0.949 34 H 0.057 0.943 35 H 0.069 0.931 36 H 0.076 0.924 37 H 0.073 0.927 38 H 0.061 0.939 39 H 0.056 0.944 40 H 0.078 0.922 41 H 0.071 0.929 42 H 0.072 0.928 43 H 0.085 0.915 44 H 0.075 0.925 45 H 0.086 0.914 46 H 0.093 0.907 47 H 0.079 0.921 48 H 0.072 0.928 49 H 0.075 0.925 50 H 0.072 0.928 51 H 0.017 0.983 52 H 0.015 0.985 53 H 0.264 0.736 For the charges calculated by CM2: Dipole moment (debyes) X Y Z Total from point charges -13.020 20.667 -11.984 27.208 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 -0.064 4.064 2 O -0.324 6.324 3 C 0.099 3.901 4 O -0.322 6.322 5 C -0.013 4.013 6 C -0.144 4.144 7 C -0.094 4.094 8 N -0.207 5.207 9 C -0.091 4.091 10 C -0.167 4.167 11 C -0.139 4.139 12 C -0.037 4.037 13 C -0.150 4.150 14 C -0.026 4.026 15 N -0.346 5.346 16 C 0.016 3.984 17 C -0.061 4.061 18 C -0.560 4.560 19 H 0.092 0.908 20 C -0.132 4.132 21 N -0.539 5.539 22 Si 0.708 3.292 23 H -0.202 1.202 24 H -0.213 1.213 25 H -0.192 1.192 26 C 0.286 3.714 27 O -0.401 6.401 28 H 0.060 0.940 29 H 0.103 0.897 30 H 0.067 0.933 31 H 0.108 0.892 32 H 0.108 0.892 33 H 0.069 0.931 34 H 0.075 0.925 35 H 0.088 0.912 36 H 0.095 0.905 37 H 0.091 0.909 38 H 0.079 0.921 39 H 0.075 0.925 40 H 0.097 0.903 41 H 0.090 0.910 42 H 0.091 0.909 43 H 0.104 0.896 44 H 0.094 0.906 45 H 0.104 0.896 46 H 0.111 0.889 47 H 0.098 0.902 48 H 0.090 0.910 49 H 0.093 0.907 50 H 0.091 0.909 51 H 0.035 0.965 52 H 0.033 0.967 53 H 0.074 0.926 Dipole moment (debyes) X Y Z Total from point charges -13.310 20.481 -12.063 27.242 hybrid contribution -0.133 -0.797 0.978 1.269 sum -13.442 19.683 -11.085 26.287 Atomic orbital electron populations 1.22762 0.80510 1.02802 1.00347 1.88029 1.20852 1.29595 1.93952 1.23923 0.98600 0.82711 0.84852 1.87967 1.61059 1.62247 1.20918 1.22489 0.92141 0.97982 0.88683 1.21380 1.00159 1.00990 0.91918 1.22346 0.99580 0.98191 0.89297 1.64844 1.01466 1.52967 1.01405 1.22927 0.91895 1.00152 0.94125 1.22433 0.96203 1.02293 0.95767 1.22248 0.95138 1.02420 0.94084 1.22213 0.94085 0.92553 0.94808 1.22470 0.91546 0.97357 1.03616 1.22188 0.96388 0.82268 1.01751 1.48733 1.07102 1.08830 1.69919 1.21598 0.95076 0.81386 1.00321 1.19881 0.96987 0.96531 0.92751 1.20953 1.35750 1.03109 0.96202 0.90814 1.24976 0.94509 0.94599 0.99083 1.69905 1.41010 1.12884 1.30070 0.86765 0.78914 0.79507 0.84010 1.20233 1.21271 1.19180 1.20941 0.82879 0.90858 0.76678 1.90691 1.54706 1.45281 1.49431 0.94023 0.89704 0.93275 0.89237 0.89189 0.93080 0.92475 0.91241 0.90500 0.90877 0.92086 0.92536 0.90329 0.91021 0.90888 0.89635 0.90594 0.89585 0.88874 0.90248 0.90970 0.90685 0.90942 0.96488 0.96687 0.92617 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 0.03 0.26 10.89 101.05 1.10 1.36 16 2 O -0.40 -4.26 10.76 -59.04 -0.64 -4.90 16 3 C 0.21 1.83 7.07 101.05 0.71 2.54 16 4 O -0.40 -4.28 10.40 -59.04 -0.61 -4.89 16 5 C 0.06 0.68 5.82 37.16 0.22 0.89 16 6 C -0.11 -1.14 5.64 -26.73 -0.15 -1.29 16 7 C 0.03 0.42 3.83 -3.82 -0.01 0.41 16 8 N -0.48 -5.90 4.99 -217.66 -1.09 -6.98 16 9 C 0.04 0.44 5.29 -2.58 -0.01 0.43 16 10 C -0.13 -1.49 6.86 -25.22 -0.17 -1.66 16 11 C -0.10 -1.18 5.97 -25.41 -0.15 -1.33 16 12 C 0.06 0.74 0.55 -132.05 -0.07 0.67 16 13 C -0.11 -1.15 6.34 -25.58 -0.16 -1.31 16 14 C 0.10 1.21 7.37 -2.90 -0.02 1.19 16 15 N -0.61 -10.42 2.95 -172.54 -0.51 -10.93 16 16 C 0.14 2.76 5.88 -4.05 -0.02 2.74 16 17 C -0.02 -0.57 4.37 -27.88 -0.12 -0.69 16 18 C -0.52 -14.95 9.66 -34.44 -0.33 -15.29 16 19 H 0.07 2.24 7.99 -52.49 -0.42 1.82 16 20 C 0.07 2.06 5.47 -17.82 -0.10 1.96 16 21 N -0.90 -27.88 13.96 55.43 0.77 -27.10 16 22 Si 0.88 22.14 27.47 -169.99 -4.67 17.47 16 23 H -0.28 -6.96 7.11 56.52 0.40 -6.56 16 24 H -0.29 -7.06 7.11 56.52 0.40 -6.65 16 25 H -0.27 -6.43 6.54 56.52 0.37 -6.06 16 26 C 0.50 8.71 5.56 -11.28 -0.06 8.65 16 27 O -0.52 -11.07 15.43 5.56 0.09 -10.98 16 28 H 0.04 0.25 8.11 -51.93 -0.42 -0.17 16 29 H 0.08 0.59 8.14 -51.93 -0.42 0.17 16 30 H 0.05 0.41 8.03 -51.93 -0.42 -0.01 16 31 H 0.09 0.56 8.01 -51.93 -0.42 0.14 16 32 H 0.09 0.64 8.01 -51.93 -0.42 0.23 16 33 H 0.05 0.49 8.11 -51.93 -0.42 0.07 16 34 H 0.06 0.68 8.03 -51.93 -0.42 0.27 16 35 H 0.07 0.77 7.52 -51.93 -0.39 0.38 16 36 H 0.08 0.79 8.14 -51.93 -0.42 0.37 16 37 H 0.07 0.89 7.36 -51.93 -0.38 0.50 16 38 H 0.06 0.95 5.87 -51.93 -0.30 0.64 16 39 H 0.06 0.78 7.42 -51.93 -0.39 0.40 16 40 H 0.08 0.80 8.14 -51.93 -0.42 0.38 16 41 H 0.07 0.94 8.14 -51.93 -0.42 0.52 16 42 H 0.07 0.68 8.14 -51.93 -0.42 0.25 16 43 H 0.09 0.80 7.77 -51.93 -0.40 0.40 16 44 H 0.08 0.99 8.01 -51.93 -0.42 0.57 16 45 H 0.09 0.83 7.43 -51.93 -0.39 0.44 16 46 H 0.09 0.76 7.63 -51.93 -0.40 0.36 16 47 H 0.08 0.85 8.14 -51.93 -0.42 0.43 16 48 H 0.07 0.87 8.14 -51.93 -0.42 0.45 16 49 H 0.07 1.64 7.95 -51.93 -0.41 1.22 16 50 H 0.07 1.35 8.14 -51.92 -0.42 0.92 16 51 H 0.02 0.40 7.20 -51.93 -0.37 0.03 16 52 H 0.01 0.39 7.57 -51.93 -0.39 -0.01 16 53 H 0.26 7.64 8.31 -40.82 -0.34 7.31 16 LS Contribution 414.76 15.07 6.25 6.25 Total: -1.00 -34.48 414.76 -9.49 -43.97 By element: Atomic # 1 Polarization: 8.55 SS G_CDS: -9.72 Total: -1.17 kcal Atomic # 6 Polarization: -1.37 SS G_CDS: 0.63 Total: -0.74 kcal Atomic # 7 Polarization: -44.20 SS G_CDS: -0.82 Total: -45.02 kcal Atomic # 8 Polarization: -19.60 SS G_CDS: -1.16 Total: -20.77 kcal Atomic # 14 Polarization: 22.14 SS G_CDS: -4.67 Total: 17.47 kcal Total LS contribution 6.25 Total: 6.25 kcal Total: -34.48 -9.49 -43.97 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. ZINC001273466709.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 -81.139 kcal (2) G-P(sol) polarization free energy of solvation -34.483 kcal (3) G-ENP(sol) elect.-nuc.-pol. free energy of system -115.622 kcal (4) G-CDS(sol) cavity-dispersion-solvent structure free energy -9.492 kcal (5) G-P-CDS(sol) = G-P(sol) + G-CDS(sol) = (2) + (4) -43.975 kcal (6) G-S(sol) free energy of system = (1) + (5) -125.114 kcal 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED Total computer time = 0.72 seconds