Wall clock time and date at job start Tue Mar 31 2020 05:41:42 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 1.53003 * 1 3 3 H 1.08995 * 109.46810 * 2 1 4 4 C 1.50691 * 109.46974 * 119.99894 * 2 1 3 5 5 N 1.31131 * 126.55498 * 253.85274 * 4 2 1 6 6 C 1.34499 * 105.61573 * 180.02562 * 5 4 2 7 7 C 1.50700 * 126.28414 * 179.97438 * 6 5 4 8 8 C 1.53005 * 117.49770 * 188.62422 * 7 6 5 9 9 C 1.52993 * 117.50067 * 119.99990 * 7 6 5 10 10 N 1.29945 * 107.42465 * 0.02562 * 6 5 4 11 11 O 1.21298 * 110.25070 * 359.70301 * 10 6 5 12 12 N 1.46902 * 109.47012 * 240.00087 * 2 1 3 13 13 C 1.46951 * 110.99885 * 178.37041 * 12 2 1 14 14 C 1.53047 * 109.38252 * 176.82119 * 13 12 2 15 15 N 1.46959 * 109.36374 * 58.38994 * 14 13 12 16 16 C 1.46902 * 111.00065 * 176.81221 * 15 14 13 17 17 C 1.53001 * 109.47177 * 176.21535 * 16 15 14 18 18 H 1.08998 * 109.46916 * 305.19630 * 17 16 15 19 19 C 1.47201 * 109.46982 * 65.19307 * 17 16 15 20 20 N 7.01878 * 109.68342 * 282.99033 * 2 1 3 21 21 C 1.53003 * 109.46869 * 185.19380 * 17 16 15 22 22 C 1.50700 * 109.46671 * 175.00141 * 21 17 16 23 23 H 1.08003 * 120.00273 * 359.97438 * 22 21 17 24 24 C 1.37877 * 119.99915 * 179.97438 * 22 21 17 25 25 N 1.31514 * 119.99936 * 179.97438 * 24 22 21 26 26 Si 1.86798 * 119.99896 * 0.02562 * 24 22 21 27 27 H 1.48507 * 109.47448 * 89.99764 * 26 24 22 28 28 H 1.48503 * 109.47413 * 209.99877 * 26 24 22 29 29 H 1.48500 * 109.47198 * 330.00141 * 26 24 22 30 30 C 1.46952 * 110.88133 * 300.67801 * 15 14 13 31 31 C 1.46962 * 111.01618 * 54.55633 * 12 2 1 32 32 H 1.09000 * 109.47493 * 180.02562 * 1 2 3 33 33 H 1.09003 * 109.47218 * 300.00060 * 1 2 3 34 34 H 1.09007 * 109.47090 * 59.99966 * 1 2 3 35 35 H 1.09000 * 115.54940 * 334.32798 * 7 6 5 36 36 H 1.09002 * 117.49534 * 359.97438 * 8 7 6 37 37 H 1.08993 * 117.49787 * 145.01822 * 8 7 6 38 38 H 1.09003 * 117.50208 * 214.97578 * 9 7 6 39 39 H 1.08999 * 117.49994 * 359.97438 * 9 7 6 40 40 H 1.08997 * 109.49163 * 56.84421 * 13 12 2 41 41 H 1.09001 * 109.49308 * 296.80226 * 13 12 2 42 42 H 1.08998 * 109.48889 * 178.35562 * 14 13 12 43 43 H 1.08997 * 109.48834 * 298.42268 * 14 13 12 44 44 H 1.09004 * 109.47090 * 296.21207 * 16 15 14 45 45 H 1.08997 * 109.47062 * 56.21520 * 16 15 14 46 46 H 1.08999 * 109.46988 * 294.99811 * 21 17 16 47 47 H 1.08994 * 109.47415 * 55.00262 * 21 17 16 48 48 H 0.97005 * 119.99344 * 180.02562 * 25 24 22 49 49 H 1.09007 * 109.49069 * 179.28702 * 30 15 14 50 50 H 1.08992 * 109.49070 * 299.33003 * 30 15 14 51 51 H 1.09005 * 109.46888 * 63.20344 * 31 12 2 52 52 H 1.08994 * 109.51188 * 303.15636 * 31 12 2 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 1 1.8933 1.0276 0.0000 4 6 2.0323 -0.7103 1.2304 5 7 2.5688 -0.1534 2.2894 6 6 2.8620 -1.1678 3.1226 7 6 3.4989 -1.0486 4.4832 8 6 3.9283 -2.3425 5.1780 9 6 2.7064 -1.5722 5.6825 10 7 2.4961 -2.2693 2.5384 11 8 2.0121 -2.0281 1.4527 12 7 2.0197 -0.6925 -1.1995 13 6 3.4881 -0.6784 -1.2531 14 6 3.9596 -1.4756 -2.4715 15 7 3.3853 -0.8883 -3.6901 16 6 3.8753 -1.5805 -4.8895 17 6 3.1855 -1.0050 -6.1281 18 1 2.1045 -1.0620 -6.0012 19 6 3.5855 0.4007 -6.3038 20 7 3.8941 1.4855 -6.4395 21 6 3.5976 -1.8106 -7.3618 22 6 2.8254 -1.3233 -8.5607 23 1 2.1118 -0.5197 -8.4534 24 6 3.0299 -1.9034 -9.7947 25 7 2.3557 -1.4784 -10.8409 26 14 4.2636 -3.2937 -9.9803 27 1 3.5812 -4.5940 -9.7587 28 1 4.8405 -3.2643 -11.3484 29 1 5.3498 -3.1283 -8.9813 30 6 1.9168 -0.9029 -3.6367 31 6 1.4453 -0.1056 -2.4183 32 1 -0.3634 -1.0276 0.0005 33 1 -0.3634 0.5139 0.8900 34 1 -0.3633 0.5139 -0.8900 35 1 4.1187 -0.1652 4.6364 36 1 3.7496 -3.2798 4.6511 37 1 4.8307 -2.3104 5.7883 38 1 2.8050 -1.0334 6.6250 39 1 1.7241 -2.0024 5.4876 40 1 3.8896 -1.1297 -0.3458 41 1 3.8393 0.3504 -1.3335 42 1 5.0475 -1.4419 -2.5294 43 1 3.6320 -2.5109 -2.3776 44 1 4.9528 -1.4398 -4.9755 45 1 3.6529 -2.6446 -4.8113 46 1 4.6651 -1.6815 -7.5402 47 1 3.3821 -2.8660 -7.1953 48 1 2.4994 -1.8868 -11.7090 49 1 1.5154 -0.4516 -4.5441 50 1 1.5660 -1.9317 -3.5565 51 1 1.7729 0.9298 -2.5122 52 1 0.3574 -0.1390 -2.3606 RHF calculation, no. of doubly occupied orbitals= 68 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 ZINC000069485217.mol2 52 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 05:41:42 Heat of formation + Delta-G solvation = 140.183503 kcal Electronic energy + Delta-G solvation = -31874.671163 eV Core-core repulsion = 27685.969807 eV Total energy + Delta-G solvation = -4188.701357 eV No. of doubly occupied orbitals = 68 Molecular weight (most abundant/longest-lived isotopes) = 359.206 amu Computer time = 1.14 seconds Orbital eigenvalues (eV) -45.90355 -39.90016 -38.14579 -37.60179 -35.93140 -35.37085 -33.81253 -32.81298 -31.91762 -31.18065 -30.50394 -27.87556 -25.90155 -25.70135 -25.08916 -23.60395 -22.93653 -22.75505 -22.29924 -21.42843 -20.43907 -19.86272 -18.46823 -17.91214 -17.00318 -16.86408 -16.56902 -16.27529 -15.95660 -15.24787 -15.12252 -14.99820 -14.82532 -14.72752 -14.21114 -13.89125 -13.35277 -13.28970 -13.16815 -12.86249 -12.76935 -12.62660 -12.47874 -12.42207 -12.32668 -12.15527 -12.09042 -11.91956 -11.81727 -11.48929 -11.40496 -11.37529 -11.27012 -11.20422 -11.18921 -11.05668 -10.88821 -10.64074 -10.36647 -10.02909 -9.94138 -9.75787 -9.33688 -8.84469 -8.63715 -8.30461 -6.12785 -4.13611 0.79766 1.76718 2.45558 2.90890 3.24446 3.27398 3.33745 3.34370 3.38778 3.63390 3.71714 3.79185 3.85869 4.18363 4.27258 4.36549 4.39603 4.42825 4.56289 4.71618 4.73859 4.86071 4.88941 5.04310 5.07219 5.11993 5.14800 5.18128 5.21269 5.22136 5.28700 5.35648 5.38587 5.46142 5.47843 5.52696 5.55611 5.57085 5.63579 5.66969 5.76680 5.80435 5.87598 5.95273 6.17368 6.26918 6.46920 6.56656 6.89192 7.02146 7.03458 7.10496 7.61229 7.86768 8.37730 8.49629 8.90260 9.47123 11.00196 Molecular weight = 359.21amu Principal moments of inertia in cm(-1) A = 0.021124 B = 0.001805 C = 0.001751 Principal moments of inertia in units of 10**(-40)*gram-cm**2 A = 1325.196891 B =15506.290022 C =15986.211291 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 0.174 3.826 3 H 0.090 0.910 4 C 0.199 3.801 5 N -0.480 5.480 6 C 0.198 3.802 7 C -0.080 4.080 8 C -0.158 4.158 9 C -0.157 4.157 10 N -0.386 5.386 11 O 0.097 5.903 12 N -0.532 5.532 13 C 0.058 3.942 14 C 0.061 3.939 15 N -0.542 5.542 16 C 0.061 3.939 17 C 0.015 3.985 18 H 0.108 0.892 19 C 0.251 3.749 20 N -0.469 5.469 21 C -0.005 4.005 22 C -0.528 4.528 23 H 0.074 0.926 24 C 0.072 3.928 25 N -0.896 5.896 26 Si 0.877 3.123 27 H -0.275 1.275 28 H -0.287 1.287 29 H -0.264 1.264 30 C 0.048 3.952 31 C 0.057 3.943 32 H 0.076 0.924 33 H 0.069 0.931 34 H 0.084 0.916 35 H 0.135 0.865 36 H 0.104 0.896 37 H 0.108 0.892 38 H 0.109 0.891 39 H 0.097 0.903 40 H 0.068 0.932 41 H 0.050 0.950 42 H 0.081 0.919 43 H 0.047 0.953 44 H 0.081 0.919 45 H 0.055 0.945 46 H 0.025 0.975 47 H 0.033 0.967 48 H 0.265 0.735 49 H 0.093 0.907 50 H 0.051 0.949 51 H 0.050 0.950 52 H 0.091 0.909 For the charges calculated by CM2: Dipole moment (debyes) X Y Z Total from point charges -1.532 -1.837 31.697 31.787 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 -0.209 4.209 2 C 0.064 3.936 3 H 0.108 0.892 4 C -0.022 4.022 5 N -0.214 5.214 6 C -0.074 4.074 7 C -0.100 4.100 8 C -0.196 4.196 9 C -0.195 4.195 10 N -0.092 5.092 11 O 0.038 5.962 12 N -0.259 5.259 13 C -0.070 4.070 14 C -0.067 4.067 15 N -0.267 5.267 16 C -0.067 4.067 17 C -0.007 4.007 18 H 0.126 0.874 19 C -0.066 4.066 20 N -0.145 5.145 21 C -0.044 4.044 22 C -0.566 4.566 23 H 0.092 0.908 24 C -0.131 4.131 25 N -0.534 5.534 26 Si 0.704 3.296 27 H -0.200 1.200 28 H -0.213 1.213 29 H -0.189 1.189 30 C -0.080 4.080 31 C -0.071 4.071 32 H 0.095 0.905 33 H 0.088 0.912 34 H 0.102 0.898 35 H 0.153 0.847 36 H 0.122 0.878 37 H 0.126 0.874 38 H 0.127 0.873 39 H 0.116 0.884 40 H 0.086 0.914 41 H 0.068 0.932 42 H 0.099 0.901 43 H 0.065 0.935 44 H 0.100 0.900 45 H 0.073 0.927 46 H 0.044 0.956 47 H 0.051 0.949 48 H 0.074 0.926 49 H 0.111 0.889 50 H 0.069 0.931 51 H 0.068 0.932 52 H 0.109 0.891 Dipole moment (debyes) X Y Z Total from point charges -0.840 -0.674 31.906 31.924 hybrid contribution 0.517 -1.073 -0.434 1.268 sum -0.323 -1.747 31.472 31.522 Atomic orbital electron populations 1.22006 0.90996 1.04294 1.03636 1.20088 0.96748 0.94295 0.82517 0.89194 1.28573 0.95041 0.81423 0.97150 1.71844 1.17033 1.30584 1.01916 1.24751 1.00375 0.83772 0.98518 1.20066 1.04012 1.01030 0.84850 1.23087 0.99250 0.94918 1.02329 1.23078 0.96885 1.02917 0.96609 1.74610 1.15577 1.23780 0.95202 1.85365 1.57278 1.26783 1.26823 1.62214 1.08156 1.54288 1.01264 1.22186 0.86525 1.00164 0.98158 1.22072 0.99559 0.96559 0.88555 1.62222 1.07361 1.55076 1.02072 1.22259 1.00448 0.96281 0.87753 1.19094 1.01403 0.83927 0.96257 0.87427 1.28689 0.92646 0.94327 0.90979 1.81009 1.09715 1.13133 1.10648 1.19642 0.97850 0.95137 0.91777 1.21009 1.23908 1.20355 0.91339 0.90788 1.24984 0.95550 0.96764 0.95766 1.69906 1.41324 1.42121 1.00055 0.86828 0.82264 0.82779 0.77752 1.20038 1.21305 1.18852 1.22320 0.87952 0.99930 0.97813 1.22325 0.99863 0.97239 0.87628 0.90480 0.91233 0.89756 0.84697 0.87750 0.87362 0.87311 0.88428 0.91399 0.93182 0.90101 0.93498 0.90019 0.92679 0.95627 0.94908 0.92553 0.88850 0.93096 0.93193 0.89087 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 8.77 37.16 0.33 -0.60 16 2 C 0.17 1.41 2.62 -68.87 -0.18 1.23 16 3 H 0.09 0.71 8.14 -51.93 -0.42 0.29 16 4 C 0.20 2.00 5.85 -13.06 -0.08 1.93 16 5 N -0.48 -5.33 11.55 -9.87 -0.11 -5.44 16 6 C 0.20 2.11 7.74 -156.37 -1.21 0.90 16 7 C -0.08 -0.61 6.33 -91.77 -0.58 -1.19 16 8 C -0.16 -0.97 10.14 -26.73 -0.27 -1.24 16 9 C -0.16 -0.92 10.23 -26.73 -0.27 -1.19 16 10 N -0.39 -4.47 11.77 30.90 0.36 -4.11 16 11 O 0.10 1.09 11.31 18.09 0.20 1.30 16 12 N -0.53 -4.83 4.57 -227.88 -1.04 -5.87 16 13 C 0.06 0.57 5.41 -3.77 -0.02 0.55 16 14 C 0.06 0.63 5.62 -3.77 -0.02 0.61 16 15 N -0.54 -6.56 4.52 -234.47 -1.06 -7.62 16 16 C 0.06 0.81 4.49 -3.82 -0.02 0.80 16 17 C 0.01 0.25 1.80 -93.40 -0.17 0.08 16 18 H 0.11 1.70 5.94 -51.93 -0.31 1.39 16 19 C 0.25 4.99 13.67 -20.76 -0.28 4.70 16 20 N -0.47 -10.32 18.54 42.16 0.78 -9.54 16 21 C -0.01 -0.11 3.49 -27.88 -0.10 -0.20 16 22 C -0.53 -13.92 9.15 -34.44 -0.32 -14.24 16 23 H 0.07 2.14 7.84 -52.48 -0.41 1.73 16 24 C 0.07 1.98 5.47 -17.82 -0.10 1.89 16 25 N -0.90 -26.68 13.96 55.43 0.77 -25.91 16 26 Si 0.88 20.39 27.47 -169.99 -4.67 15.72 16 27 H -0.27 -6.19 7.11 56.52 0.40 -5.79 16 28 H -0.29 -6.78 7.11 56.52 0.40 -6.38 16 29 H -0.26 -5.81 6.54 56.52 0.37 -5.45 16 30 C 0.05 0.52 5.14 -3.77 -0.02 0.50 16 31 C 0.06 0.51 5.19 -3.76 -0.02 0.49 16 32 H 0.08 0.50 8.14 -51.93 -0.42 0.08 16 33 H 0.07 0.39 8.14 -51.93 -0.42 -0.03 16 34 H 0.08 0.42 6.26 -51.93 -0.33 0.10 16 35 H 0.14 0.87 8.14 -51.93 -0.42 0.45 16 36 H 0.10 0.76 7.91 -51.93 -0.41 0.35 16 37 H 0.11 0.45 8.14 -51.93 -0.42 0.03 16 38 H 0.11 0.42 8.14 -51.93 -0.42 0.00 16 39 H 0.10 0.65 8.14 -51.93 -0.42 0.22 16 40 H 0.07 0.69 7.03 -51.93 -0.37 0.33 16 41 H 0.05 0.53 8.14 -51.93 -0.42 0.11 16 42 H 0.08 0.80 8.14 -51.93 -0.42 0.38 16 43 H 0.05 0.49 8.14 -51.93 -0.42 0.07 16 44 H 0.08 1.09 8.14 -51.93 -0.42 0.67 16 45 H 0.06 0.66 8.14 -51.93 -0.42 0.24 16 46 H 0.03 0.55 7.20 -51.93 -0.37 0.17 16 47 H 0.03 0.63 7.57 -51.93 -0.39 0.24 16 48 H 0.26 7.39 8.31 -40.82 -0.34 7.05 16 49 H 0.09 1.09 5.89 -51.93 -0.31 0.78 16 50 H 0.05 0.54 8.14 -51.93 -0.42 0.12 16 51 H 0.05 0.49 8.14 -51.93 -0.42 0.07 16 52 H 0.09 0.65 6.04 -51.93 -0.31 0.33 16 LS Contribution 419.51 15.07 6.32 6.32 Total: -1.00 -32.53 419.51 -10.06 -42.59 By element: Atomic # 1 Polarization: 5.84 SS G_CDS: -8.29 Total: -2.45 kcal Atomic # 6 Polarization: -1.66 SS G_CDS: -3.33 Total: -4.99 kcal Atomic # 7 Polarization: -58.20 SS G_CDS: -0.30 Total: -58.49 kcal Atomic # 8 Polarization: 1.09 SS G_CDS: 0.20 Total: 1.30 kcal Atomic # 14 Polarization: 20.39 SS G_CDS: -4.67 Total: 15.72 kcal Total LS contribution 6.32 Total: 6.32 kcal Total: -32.53 -10.06 -42.59 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. ZINC000069485217.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 182.774 kcal (2) G-P(sol) polarization free energy of solvation -32.533 kcal (3) G-ENP(sol) elect.-nuc.-pol. free energy of system 150.241 kcal (4) G-CDS(sol) cavity-dispersion-solvent structure free energy -10.058 kcal (5) G-P-CDS(sol) = G-P(sol) + G-CDS(sol) = (2) + (4) -42.591 kcal (6) G-S(sol) free energy of system = (1) + (5) 140.184 kcal 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED Total computer time = 1.14 seconds