Wall clock time and date at job start Sat Apr 11 2020 06:10:06 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 1.52998 * 1 3 3 H 1.09001 * 109.47436 * 2 1 4 4 C 1.50700 * 109.47131 * 119.99590 * 2 1 3 5 5 O 1.21283 * 119.99882 * 119.99642 * 4 2 1 6 6 N 1.34781 * 119.99963 * 300.00267 * 4 2 1 7 7 C 1.46496 * 120.00073 * 0.02562 * 6 4 2 8 8 C 1.46507 * 119.99730 * 179.97438 * 6 4 2 9 9 C 1.50700 * 109.46732 * 90.00326 * 8 6 4 10 10 H 1.08001 * 120.00357 * 359.97438 * 9 8 6 11 11 C 1.37881 * 119.99566 * 179.97438 * 9 8 6 12 12 N 1.31512 * 120.00229 * 0.02562 * 11 9 8 13 13 Si 1.86797 * 119.99619 * 179.97438 * 11 9 8 14 14 H 1.48506 * 109.47189 * 90.00273 * 13 11 9 15 15 H 1.48506 * 109.47086 * 209.99979 * 13 11 9 16 16 H 1.48506 * 109.47542 * 330.00003 * 13 11 9 17 17 N 1.46900 * 109.47437 * 239.99650 * 2 1 3 18 18 C 1.46464 * 111.00073 * 171.58818 * 17 2 1 19 19 C 1.53255 * 109.89419 * 162.20800 * 18 17 2 20 20 S 1.81927 * 108.47049 * 62.05031 * 19 18 17 21 21 C 1.81791 * 101.90945 * 308.78921 * 20 19 18 22 22 C 1.52832 * 109.48528 * 171.00873 * 21 20 19 23 23 C 1.53017 * 109.52124 * 179.82860 * 22 21 20 24 24 C 1.53004 * 109.45857 * 300.21720 * 23 22 21 25 25 C 1.53003 * 109.47733 * 60.09975 * 24 23 22 26 26 C 1.52847 * 109.46219 * 291.38386 * 21 20 19 27 27 C 1.46493 * 110.99817 * 45.59861 * 17 2 1 28 28 H 1.09002 * 109.46805 * 52.54883 * 1 2 3 29 29 H 1.08997 * 109.46865 * 172.54589 * 1 2 3 30 30 H 1.08995 * 109.47230 * 292.54609 * 1 2 3 31 31 H 1.09002 * 109.47172 * 89.99781 * 7 6 4 32 32 H 1.09003 * 109.47253 * 209.99713 * 7 6 4 33 33 H 1.08997 * 109.46749 * 329.99728 * 7 6 4 34 34 H 1.09005 * 109.46689 * 210.00053 * 8 6 4 35 35 H 1.08994 * 109.47040 * 330.00341 * 8 6 4 36 36 H 0.97002 * 120.00057 * 180.02562 * 12 11 9 37 37 H 1.08999 * 109.40433 * 282.34648 * 18 17 2 38 38 H 1.09010 * 109.39655 * 42.08289 * 18 17 2 39 39 H 1.08991 * 109.63603 * 181.74327 * 19 18 17 40 40 H 1.08996 * 109.63574 * 302.35730 * 19 18 17 41 41 H 1.09005 * 109.46213 * 299.84322 * 22 21 20 42 42 H 1.09001 * 109.46421 * 59.80868 * 22 21 20 43 43 H 1.08997 * 109.47492 * 180.22157 * 23 22 21 44 44 H 1.09006 * 109.47480 * 60.21538 * 23 22 21 45 45 H 1.09000 * 109.47226 * 300.09737 * 24 23 22 46 46 H 1.09001 * 109.47200 * 180.09637 * 24 23 22 47 47 H 1.08993 * 109.47982 * 179.89528 * 25 24 23 48 48 H 1.09001 * 109.47964 * 59.88100 * 25 24 23 49 49 H 1.09003 * 109.46511 * 300.16463 * 26 21 20 50 50 H 1.09001 * 109.46469 * 60.14345 * 26 21 20 51 51 H 1.09005 * 109.40364 * 317.70777 * 27 17 2 52 52 H 1.09002 * 109.40459 * 77.53850 * 27 17 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 1.8934 1.0277 0.0000 4 6 2.0323 -0.7103 1.2305 5 8 2.7295 -1.6965 1.1193 6 7 1.7067 -0.2498 2.4546 7 6 0.8639 0.9410 2.5890 8 6 2.1946 -0.9407 3.6509 9 6 3.5222 -0.3576 4.0612 10 1 3.9591 0.4468 3.4881 11 6 4.1792 -0.8511 5.1684 12 7 3.6475 -1.8310 5.8660 13 14 5.8252 -0.1289 5.6767 14 1 5.6020 0.9968 6.6192 15 1 6.6414 -1.1765 6.3413 16 1 6.5409 0.3672 4.4737 17 7 2.0197 -0.6926 -1.1994 18 6 3.4700 -0.5413 -1.3374 19 6 4.0155 -1.6013 -2.3005 20 16 3.2624 -1.3368 -3.9353 21 6 1.4927 -1.2636 -3.5257 22 6 0.7024 -0.8209 -4.7566 23 6 -0.7878 -0.7631 -4.4139 24 6 -1.2625 -2.1478 -3.9688 25 6 -0.4736 -2.5848 -2.7328 26 6 1.0168 -2.6442 -3.0745 27 6 1.2926 -0.2534 -2.3928 28 1 -0.3633 0.6249 -0.8159 29 1 -0.3633 -1.0190 -0.1333 30 1 -0.3633 0.3940 0.9491 31 1 -0.1839 0.6426 2.6224 32 1 1.1216 1.4666 3.5084 33 1 1.0271 1.5996 1.7360 34 1 1.4765 -0.8151 4.4612 35 1 2.3154 -2.0019 3.4336 36 1 4.1095 -2.1780 6.6452 37 1 3.6951 0.4517 -1.7265 38 1 3.9410 -0.6618 -0.3618 39 1 5.0985 -1.5046 -2.3762 40 1 3.7581 -2.5953 -1.9351 41 1 1.0415 0.1664 -5.0703 42 1 0.8616 -1.5335 -5.5660 43 1 -1.3511 -0.4512 -5.2934 44 1 -0.9477 -0.0475 -3.6073 45 1 -1.1010 -2.8637 -4.7747 46 1 -2.3244 -2.1073 -3.7263 47 1 -0.8130 -3.5704 -2.4146 48 1 -0.6333 -1.8679 -1.9274 49 1 1.1770 -3.3639 -3.8773 50 1 1.5793 -2.9522 -2.1931 51 1 0.2303 -0.1748 -2.1612 52 1 1.6675 0.7206 -2.7074 RHF calculation, no. of doubly occupied orbitals= 63 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). S: (AM1): M.J.S. DEWAR, Y.-C. YUAN, INORGANIC CHEM., 29, 589 (1990) 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 ZINC000079503664.mol2 52 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 06:10:06 Heat of formation + Delta-G solvation = -27.256234 kcal Electronic energy + Delta-G solvation = -29964.410186 eV Core-core repulsion = 26283.018879 eV Total energy + Delta-G solvation = -3681.391307 eV No. of doubly occupied orbitals = 63 Molecular weight (most abundant/longest-lived isotopes) = 340.193 amu Computer time = 1.01 seconds Orbital eigenvalues (eV) -40.25526 -38.93344 -36.70934 -34.87069 -33.07897 -32.15594 -31.62203 -30.90214 -28.96596 -27.47845 -26.67440 -25.78623 -23.63780 -23.02416 -22.35704 -22.12250 -21.01528 -18.86802 -18.38492 -17.31154 -16.56826 -16.30256 -15.95477 -15.38756 -15.23082 -14.91784 -14.70324 -14.26996 -14.14745 -14.06782 -13.84752 -13.78631 -13.36090 -13.04133 -12.88201 -12.65324 -12.33471 -12.26282 -12.25239 -12.07044 -11.95462 -11.74161 -11.52388 -11.41422 -11.28111 -11.21464 -11.10393 -10.98825 -10.89318 -10.59027 -10.45009 -10.34622 -10.18115 -10.10511 -9.64715 -9.44655 -8.88592 -8.46056 -8.17916 -7.66065 -7.63136 -6.06687 -4.11686 1.79783 2.55433 3.27584 3.34408 3.37011 3.42340 3.51686 4.09693 4.42275 4.46003 4.53373 4.73324 4.87308 4.88655 4.92944 5.05374 5.12460 5.13338 5.18468 5.26635 5.27558 5.30702 5.35814 5.38816 5.46732 5.49046 5.53655 5.58317 5.64764 5.69479 5.76076 5.80305 5.85202 5.90118 5.96608 5.97966 6.01451 6.03507 6.07751 6.14800 6.25132 6.38330 6.39203 6.87956 7.08178 7.15191 7.43049 7.52584 7.89775 8.20944 8.40740 8.88177 9.10484 9.53687 11.01238 Molecular weight = 340.19amu Principal moments of inertia in cm(-1) A = 0.017640 B = 0.003248 C = 0.002975 Principal moments of inertia in units of 10**(-40)*gram-cm**2 A = 1586.908810 B = 8619.801049 C = 9408.498818 Net atomic charges, atomic populations, and dipole contributions calculated with CM2 Atom NO. Type Charge No. of electrons 1 C -0.162 4.162 2 C 0.070 3.930 3 H 0.061 0.939 4 C 0.511 3.489 5 O -0.521 6.521 6 N -0.603 5.603 7 C 0.082 3.918 8 C 0.248 3.752 9 C -0.526 4.526 10 H 0.056 0.944 11 C 0.062 3.938 12 N -0.894 5.894 13 Si 0.897 3.103 14 H -0.280 1.280 15 H -0.285 1.285 16 H -0.274 1.274 17 N -0.523 5.523 18 C 0.057 3.943 19 C -0.063 4.063 20 S -0.289 6.289 21 C -0.002 4.002 22 C -0.094 4.094 23 C -0.115 4.115 24 C -0.121 4.121 25 C -0.118 4.118 26 C -0.098 4.098 27 C 0.055 3.945 28 H 0.061 0.939 29 H 0.071 0.929 30 H 0.082 0.918 31 H 0.048 0.952 32 H 0.073 0.927 33 H 0.056 0.944 34 H 0.031 0.969 35 H 0.044 0.956 36 H 0.263 0.737 37 H 0.038 0.962 38 H 0.103 0.897 39 H 0.103 0.897 40 H 0.096 0.904 41 H 0.068 0.932 42 H 0.071 0.929 43 H 0.064 0.936 44 H 0.064 0.936 45 H 0.061 0.939 46 H 0.060 0.940 47 H 0.062 0.938 48 H 0.068 0.932 49 H 0.062 0.938 50 H 0.082 0.918 51 H 0.099 0.901 52 H 0.040 0.960 For the charges calculated by CM2: Dipole moment (debyes) X Y Z Total from point charges -10.599 4.639 -19.528 22.698 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 -0.219 4.219 2 C -0.041 4.041 3 H 0.078 0.922 4 C 0.296 3.704 5 O -0.397 6.397 6 N -0.336 5.336 7 C -0.063 4.063 8 C 0.129 3.871 9 C -0.565 4.565 10 H 0.074 0.926 11 C -0.141 4.141 12 N -0.533 5.533 13 Si 0.725 3.275 14 H -0.207 1.207 15 H -0.211 1.211 16 H -0.199 1.199 17 N -0.248 5.248 18 C -0.072 4.072 19 C -0.211 4.211 20 S -0.058 6.058 21 C -0.112 4.112 22 C -0.133 4.133 23 C -0.154 4.154 24 C -0.158 4.158 25 C -0.157 4.157 26 C -0.137 4.137 27 C -0.074 4.074 28 H 0.080 0.920 29 H 0.090 0.910 30 H 0.100 0.900 31 H 0.066 0.934 32 H 0.091 0.909 33 H 0.074 0.926 34 H 0.049 0.951 35 H 0.062 0.938 36 H 0.073 0.927 37 H 0.057 0.943 38 H 0.121 0.879 39 H 0.121 0.879 40 H 0.114 0.886 41 H 0.087 0.913 42 H 0.090 0.910 43 H 0.083 0.917 44 H 0.083 0.917 45 H 0.079 0.921 46 H 0.079 0.921 47 H 0.081 0.919 48 H 0.087 0.913 49 H 0.081 0.919 50 H 0.101 0.899 51 H 0.116 0.884 52 H 0.059 0.941 Dipole moment (debyes) X Y Z Total from point charges -9.681 3.592 -20.359 22.828 hybrid contribution 0.671 1.195 1.469 2.009 sum -9.010 4.787 -18.890 21.469 Atomic orbital electron populations 1.22256 0.92932 1.03410 1.03304 1.21489 0.96466 0.95974 0.90197 0.92164 1.20035 0.81270 0.85232 0.83875 1.90653 1.37153 1.26047 1.85868 1.48123 1.49953 1.28220 1.07278 1.21778 0.93806 0.88247 1.02419 1.19263 0.94100 0.93700 0.80084 1.21417 1.04899 1.19043 1.11179 0.92608 1.24930 0.97907 0.94928 0.96293 1.69928 1.39066 1.25993 1.18290 0.86517 0.83707 0.78700 0.78600 1.20654 1.21057 1.19940 1.60716 1.04157 1.58602 1.01277 1.22262 0.87624 0.96061 1.01233 1.23453 1.01829 1.03402 0.92435 1.86689 1.06178 1.96017 1.16945 1.22621 0.92064 0.99143 0.97357 1.21357 0.94416 1.01896 0.95671 1.21577 0.94862 0.97748 1.01224 1.21575 0.99315 0.96644 0.98278 1.21613 0.94750 1.01711 0.97640 1.21674 0.96143 0.93826 1.02066 1.22527 1.00415 0.95237 0.89211 0.91998 0.90973 0.89971 0.93397 0.90852 0.92552 0.95104 0.93825 0.92700 0.94350 0.87918 0.87887 0.88586 0.91346 0.91023 0.91690 0.91734 0.92066 0.92090 0.91908 0.91310 0.91907 0.89928 0.88360 0.94134 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 -0.16 -1.84 7.75 37.16 0.29 -1.55 16 2 C 0.07 1.02 1.75 -68.87 -0.12 0.90 16 3 H 0.06 0.83 7.36 -51.93 -0.38 0.45 16 4 C 0.51 10.16 6.61 -10.98 -0.07 10.09 16 5 O -0.52 -12.56 14.29 5.56 0.08 -12.48 16 6 N -0.60 -12.29 2.86 -182.95 -0.52 -12.81 16 7 C 0.08 1.22 8.81 59.84 0.53 1.75 16 8 C 0.25 6.35 5.16 -5.19 -0.03 6.33 16 9 C -0.53 -14.70 9.39 -34.44 -0.32 -15.03 16 10 H 0.06 1.56 7.81 -52.49 -0.41 1.15 16 11 C 0.06 1.74 5.46 -17.82 -0.10 1.65 16 12 N -0.89 -26.37 13.29 55.43 0.74 -25.63 16 13 Si 0.90 21.69 29.54 -169.99 -5.02 16.67 16 14 H -0.28 -6.58 7.11 56.52 0.40 -6.18 16 15 H -0.28 -6.85 7.11 56.52 0.40 -6.45 16 16 H -0.27 -6.62 7.11 56.52 0.40 -6.22 16 17 N -0.52 -7.36 3.16 -228.52 -0.72 -8.08 16 18 C 0.06 0.86 4.94 -3.93 -0.02 0.84 16 19 C -0.06 -0.87 6.34 37.29 0.24 -0.63 16 20 S -0.29 -3.72 21.16 -107.50 -2.27 -6.00 16 21 C 0.00 -0.02 0.61 -90.74 -0.06 -0.07 16 22 C -0.09 -0.86 4.74 -26.81 -0.13 -0.99 16 23 C -0.12 -0.87 5.65 -26.72 -0.15 -1.02 16 24 C -0.12 -0.96 5.92 -26.73 -0.16 -1.12 16 25 C -0.12 -1.17 5.66 -26.72 -0.15 -1.32 16 26 C -0.10 -1.13 4.49 -26.80 -0.12 -1.25 16 27 C 0.06 0.63 3.20 -4.00 -0.01 0.62 16 28 H 0.06 0.55 6.47 -51.93 -0.34 0.22 16 29 H 0.07 0.88 6.71 -51.93 -0.35 0.53 16 30 H 0.08 0.89 4.43 -51.93 -0.23 0.66 16 31 H 0.05 0.61 6.82 -51.93 -0.35 0.25 16 32 H 0.07 1.15 8.07 -51.93 -0.42 0.73 16 33 H 0.06 0.70 6.08 -51.93 -0.32 0.38 16 34 H 0.03 0.80 8.07 -51.93 -0.42 0.38 16 35 H 0.04 1.27 7.42 -51.93 -0.39 0.89 16 36 H 0.26 7.34 8.31 -40.82 -0.34 7.00 16 37 H 0.04 0.54 7.92 -51.93 -0.41 0.13 16 38 H 0.10 1.86 6.04 -51.92 -0.31 1.55 16 39 H 0.10 1.31 8.14 -51.93 -0.42 0.89 16 40 H 0.10 1.46 7.56 -51.93 -0.39 1.07 16 41 H 0.07 0.62 8.14 -51.93 -0.42 0.20 16 42 H 0.07 0.67 8.14 -51.93 -0.42 0.25 16 43 H 0.06 0.42 8.14 -51.93 -0.42 0.00 16 44 H 0.06 0.48 6.45 -51.93 -0.33 0.15 16 45 H 0.06 0.48 8.14 -51.93 -0.42 0.06 16 46 H 0.06 0.44 8.14 -51.93 -0.42 0.01 16 47 H 0.06 0.62 8.14 -51.93 -0.42 0.20 16 48 H 0.07 0.72 4.99 -51.93 -0.26 0.46 16 49 H 0.06 0.72 8.14 -51.93 -0.42 0.29 16 50 H 0.08 1.19 6.68 -51.93 -0.35 0.84 16 51 H 0.10 0.99 2.08 -51.93 -0.11 0.89 16 52 H 0.04 0.47 7.92 -51.93 -0.41 0.06 16 LS Contribution 384.41 15.07 5.79 5.79 Total: -1.00 -31.51 384.41 -11.01 -42.52 By element: Atomic # 1 Polarization: 9.53 SS G_CDS: -8.69 Total: 0.83 kcal Atomic # 6 Polarization: -0.43 SS G_CDS: -0.38 Total: -0.81 kcal Atomic # 7 Polarization: -46.02 SS G_CDS: -0.51 Total: -46.53 kcal Atomic # 8 Polarization: -12.56 SS G_CDS: 0.08 Total: -12.48 kcal Atomic # 14 Polarization: 21.69 SS G_CDS: -5.02 Total: 16.67 kcal Atomic # 16 Polarization: -3.72 SS G_CDS: -2.27 Total: -6.00 kcal Total LS contribution 5.79 Total: 5.79 kcal Total: -31.51 -11.01 -42.52 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. ZINC000079503664.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 15.267 kcal (2) G-P(sol) polarization free energy of solvation -31.514 kcal (3) G-ENP(sol) elect.-nuc.-pol. free energy of system -16.247 kcal (4) G-CDS(sol) cavity-dispersion-solvent structure free energy -11.009 kcal (5) G-P-CDS(sol) = G-P(sol) + G-CDS(sol) = (2) + (4) -42.524 kcal (6) G-S(sol) free energy of system = (1) + (5) -27.256 kcal 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED Total computer time = 1.01 seconds