Wall clock time and date at job start Sat Apr 11 2020 06:10:56 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 C 1.53000 * 1 3 3 O 1.42902 * 109.46841 * 2 1 4 4 C 1.42897 * 114.00035 * 184.70947 * 3 2 1 5 5 H 1.08998 * 109.47344 * 328.81539 * 4 3 2 6 6 C 1.52990 * 109.47547 * 208.80686 * 4 3 2 7 7 C 1.50701 * 109.47162 * 65.00394 * 6 4 3 8 8 O 1.21281 * 119.99799 * 359.97438 * 7 6 4 9 9 N 1.34774 * 120.00032 * 180.02562 * 7 6 4 10 10 C 1.46506 * 120.00091 * 179.97438 * 9 7 6 11 11 H 1.09006 * 110.96729 * 322.30407 * 10 9 7 12 12 C 1.55012 * 111.10680 * 86.44907 * 10 9 7 13 13 O 1.43906 * 105.17927 * 81.96011 * 12 10 9 14 14 C 1.42396 * 109.55971 * 24.29450 * 13 12 10 15 15 C 1.52699 * 116.14454 * 129.84704 * 14 13 12 16 16 N 1.47217 * 87.79255 * 90.70578 * 15 14 13 17 17 C 1.36936 * 135.96812 * 206.43075 * 16 15 14 18 18 H 1.08000 * 120.00297 * 6.74973 * 17 16 15 19 19 C 1.38815 * 119.99961 * 186.46924 * 17 16 15 20 20 N 1.31624 * 119.99551 * 355.19567 * 19 17 16 21 21 Si 1.86798 * 120.00069 * 175.19177 * 19 17 16 22 22 H 1.48502 * 109.46987 * 94.98316 * 21 19 17 23 23 H 1.48506 * 109.46924 * 214.97593 * 21 19 17 24 24 H 1.48496 * 109.47360 * 334.97702 * 21 19 17 25 25 C 1.47207 * 88.05679 * 26.69019 * 16 15 14 26 26 C 1.53658 * 108.53040 * 358.08790 * 14 13 12 27 27 C 1.53010 * 109.46866 * 88.80715 * 4 3 2 28 28 C 1.53004 * 109.46803 * 64.94627 * 27 4 3 29 29 C 1.53001 * 109.47061 * 184.94740 * 27 4 3 30 30 H 1.08997 * 109.47095 * 59.99920 * 1 2 3 31 31 H 1.09001 * 109.47123 * 180.02562 * 1 2 3 32 32 H 1.09001 * 109.47193 * 299.99353 * 1 2 3 33 33 H 1.08995 * 109.47518 * 240.00349 * 2 1 3 34 34 H 1.09007 * 109.47143 * 119.99867 * 2 1 3 35 35 H 1.09002 * 109.47126 * 305.00159 * 6 4 3 36 36 H 1.09001 * 109.47618 * 185.00340 * 6 4 3 37 37 H 0.96997 * 120.00183 * 359.97438 * 9 7 6 38 38 H 1.09001 * 110.29978 * 323.03958 * 12 10 9 39 39 H 1.09004 * 110.38566 * 200.93069 * 12 10 9 40 40 H 1.08996 * 113.49858 * 335.97764 * 15 14 13 41 41 H 1.09000 * 113.55609 * 205.44065 * 15 14 13 42 42 H 0.96995 * 119.99378 * 179.97438 * 20 19 17 43 43 H 1.08998 * 113.49605 * 88.03756 * 25 16 15 44 44 H 1.08997 * 113.50020 * 218.57737 * 25 16 15 45 45 H 1.08993 * 110.93310 * 97.29640 * 26 14 13 46 46 H 1.09001 * 110.92778 * 220.96122 * 26 14 13 47 47 H 1.09005 * 109.47002 * 304.95080 * 27 4 3 48 48 H 1.08994 * 109.47325 * 306.37799 * 28 27 4 49 49 H 1.09000 * 109.46929 * 66.38054 * 28 27 4 50 50 H 1.09002 * 109.46760 * 186.37346 * 28 27 4 51 51 H 1.08999 * 109.46915 * 60.00443 * 29 27 4 52 52 H 1.08999 * 109.46931 * 179.97438 * 29 27 4 53 53 H 1.08995 * 109.47000 * 299.99809 * 29 27 4 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 8 2.0063 1.3473 0.0000 4 6 3.4266 1.4617 -0.1072 5 1 3.8973 0.6002 0.3665 6 6 3.8892 2.7429 0.5894 7 6 3.6079 2.6412 2.0665 8 8 3.0881 1.6425 2.5174 9 7 3.9330 3.6605 2.8861 10 6 3.6590 3.5619 4.3219 11 1 2.7126 3.0526 4.5044 12 6 4.8235 2.8591 5.0655 13 8 5.8092 3.8858 5.2776 14 6 5.1771 5.1618 5.2732 15 6 5.5054 6.0793 6.4488 16 7 6.6158 6.6169 5.6454 17 6 7.8247 7.2050 5.9058 18 1 8.1899 7.2627 6.9205 19 6 8.5837 7.7219 4.8647 20 7 8.1873 7.5632 3.6196 21 14 10.1673 8.6425 5.2307 22 1 11.3170 7.7075 5.1343 23 1 10.3395 9.7417 4.2472 24 1 10.1044 9.2101 6.6015 25 6 5.8543 6.2513 4.4398 26 6 3.6791 4.9637 4.9943 27 6 3.8242 1.5121 -1.5839 28 6 3.2651 2.7867 -2.2193 29 6 5.3497 1.5101 -1.7017 30 1 -0.3633 0.5138 -0.8900 31 1 -0.3633 -1.0277 0.0005 32 1 -0.3633 0.5137 0.8900 33 1 1.8934 -0.5137 -0.8899 34 1 1.8934 -0.5138 0.8900 35 1 3.3520 3.5960 0.1751 36 1 4.9595 2.8761 0.4318 37 1 4.3483 4.4593 2.5254 38 1 5.2367 2.0594 4.4508 39 1 4.4795 2.4619 6.0205 40 1 5.8332 5.5438 7.3398 41 1 4.7270 6.8125 6.6598 42 1 8.7174 7.9247 2.8922 43 1 5.1699 7.0308 4.1051 44 1 6.4766 5.8610 3.6345 45 1 3.1076 4.9586 5.9224 46 1 3.3056 5.7279 4.3127 47 1 3.4188 0.6412 -2.0992 48 1 2.1922 2.8435 -2.0363 49 1 3.7550 3.6562 -1.7810 50 1 3.4502 2.7685 -3.2933 51 1 5.7479 0.6020 -1.2490 52 1 5.6329 1.5455 -2.7536 53 1 5.7549 2.3809 -1.1864 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 ZINC001755061288.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 06:10:56 Heat of formation + Delta-G solvation = -77.182592 kcal Electronic energy + Delta-G solvation = -31271.335759 eV Core-core repulsion = 27145.026612 eV Total energy + Delta-G solvation = -4126.309147 eV No. of doubly occupied orbitals = 66 Molecular weight (most abundant/longest-lived isotopes) = 340.220 amu Computer time = 1.21 seconds Orbital eigenvalues (eV) -40.43155 -39.56058 -38.25507 -36.24184 -35.48690 -34.13093 -32.12920 -31.57645 -30.85329 -29.47037 -28.09404 -27.37199 -25.69376 -24.83383 -24.63598 -22.93722 -22.21693 -21.40328 -20.46789 -19.50972 -19.01659 -17.44981 -17.00578 -16.78130 -16.40334 -15.70224 -15.36579 -15.34352 -14.97237 -14.81165 -14.36182 -14.12532 -13.99293 -13.94590 -13.42865 -13.35527 -13.21930 -13.17579 -12.90990 -12.71193 -12.38088 -12.33322 -12.06696 -11.88728 -11.77239 -11.51043 -11.39643 -11.38657 -11.33035 -11.10527 -11.08782 -11.01226 -10.84719 -10.63371 -10.47473 -10.28015 -9.80425 -9.70479 -9.52098 -9.46429 -9.03956 -8.81089 -8.53726 -6.86192 -5.76862 -3.06784 2.74565 3.20607 3.40509 3.45413 3.47368 3.58390 4.18437 4.45287 4.47380 4.53986 4.62308 4.83586 4.92839 4.96657 5.04444 5.06183 5.08980 5.11489 5.19621 5.26619 5.30515 5.34223 5.36144 5.42520 5.46713 5.50500 5.60859 5.62896 5.63305 5.73759 5.79010 5.83533 5.88015 5.90611 5.90924 5.95581 5.98125 6.06843 6.11073 6.15090 6.39361 6.53712 6.57312 6.65272 6.91497 7.16490 7.19286 7.51687 7.61266 7.80542 7.99167 8.32790 9.04948 9.71565 10.64960 11.41790 Molecular weight = 340.22amu Principal moments of inertia in cm(-1) A = 0.014259 B = 0.002676 C = 0.002359 Principal moments of inertia in units of 10**(-40)*gram-cm**2 A = 1963.147935 B =10462.082929 C =11866.524483 Net atomic charges, atomic populations, and dipole contributions calculated with CM2 Atom NO. Type Charge No. of electrons 1 C -0.149 4.149 2 C 0.063 3.937 3 O -0.371 6.371 4 C 0.114 3.886 5 H 0.067 0.933 6 C -0.145 4.145 7 C 0.519 3.481 8 O -0.540 6.540 9 N -0.716 5.716 10 C 0.114 3.886 11 H 0.101 0.899 12 C 0.040 3.960 13 O -0.336 6.336 14 C 0.053 3.947 15 C 0.110 3.890 16 N -0.602 5.602 17 C -0.213 4.213 18 H 0.081 0.919 19 C -0.008 4.008 20 N -0.920 5.920 21 Si 0.911 3.089 22 H -0.289 1.289 23 H -0.290 1.290 24 H -0.281 1.281 25 C 0.157 3.843 26 C -0.144 4.144 27 C -0.118 4.118 28 C -0.146 4.146 29 C -0.152 4.152 30 H 0.058 0.942 31 H 0.066 0.934 32 H 0.062 0.938 33 H 0.040 0.960 34 H 0.051 0.949 35 H 0.104 0.896 36 H 0.110 0.890 37 H 0.406 0.594 38 H 0.081 0.919 39 H 0.064 0.936 40 H 0.045 0.955 41 H 0.043 0.957 42 H 0.253 0.747 43 H 0.036 0.964 44 H 0.072 0.928 45 H 0.089 0.911 46 H 0.089 0.911 47 H 0.071 0.929 48 H 0.062 0.938 49 H 0.058 0.942 50 H 0.051 0.949 51 H 0.055 0.945 52 H 0.058 0.942 53 H 0.062 0.938 For the charges calculated by CM2: Dipole moment (debyes) X Y Z Total from point charges -14.340 -13.153 -9.953 21.856 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 -0.206 4.206 2 C -0.014 4.014 3 O -0.290 6.290 4 C 0.055 3.945 5 H 0.085 0.915 6 C -0.184 4.184 7 C 0.306 3.694 8 O -0.417 6.417 9 N -0.368 5.368 10 C 0.008 3.992 11 H 0.119 0.881 12 C -0.038 4.038 13 O -0.254 6.254 14 C 0.012 3.988 15 C -0.017 4.017 16 N -0.327 5.327 17 C -0.340 4.340 18 H 0.099 0.901 19 C -0.205 4.205 20 N -0.567 5.567 21 Si 0.742 3.258 22 H -0.216 1.216 23 H -0.216 1.216 24 H -0.206 1.206 25 C 0.030 3.970 26 C -0.183 4.183 27 C -0.137 4.137 28 C -0.203 4.203 29 C -0.209 4.209 30 H 0.078 0.922 31 H 0.085 0.915 32 H 0.082 0.918 33 H 0.058 0.942 34 H 0.070 0.930 35 H 0.123 0.877 36 H 0.128 0.872 37 H 0.241 0.759 38 H 0.099 0.901 39 H 0.082 0.918 40 H 0.063 0.937 41 H 0.061 0.939 42 H 0.062 0.938 43 H 0.054 0.946 44 H 0.091 0.909 45 H 0.108 0.892 46 H 0.107 0.893 47 H 0.090 0.910 48 H 0.081 0.919 49 H 0.077 0.923 50 H 0.070 0.930 51 H 0.074 0.926 52 H 0.077 0.923 53 H 0.081 0.919 Dipole moment (debyes) X Y Z Total from point charges -14.280 -13.559 -9.647 21.928 hybrid contribution 1.056 0.814 -0.061 1.335 sum -13.223 -12.745 -9.708 20.774 Atomic orbital electron populations 1.21713 0.94188 1.01843 1.02865 1.22387 0.95135 0.84178 0.99697 1.87883 1.20558 1.26142 1.94394 1.21736 0.82281 0.97014 0.93425 0.91528 1.21940 1.03893 1.00482 0.92111 1.20526 0.77532 0.82805 0.88523 1.90664 1.42835 1.30556 1.77644 1.45929 1.63204 1.20360 1.07280 1.22509 0.99134 0.96963 0.80560 0.88090 1.23828 0.89368 0.91934 0.98699 1.88445 1.30829 1.13303 1.92811 1.23504 0.88932 0.85635 1.00749 1.22715 0.91133 0.93022 0.94822 1.45374 1.14064 1.71317 1.01969 1.18908 0.91866 1.29668 0.93548 0.90120 1.24796 0.99274 1.01135 0.95273 1.69833 1.39519 1.49691 0.97634 0.86107 0.83078 0.79414 0.77238 1.21603 1.21633 1.20620 1.22357 0.91914 0.89955 0.92732 1.23215 0.97726 0.95936 1.01429 1.21629 0.96352 0.99563 0.96159 1.21822 1.01704 0.96877 0.99913 1.21910 0.94531 1.02341 1.02135 0.92243 0.91505 0.91849 0.94151 0.93045 0.87749 0.87245 0.75855 0.90050 0.91816 0.93650 0.93949 0.93752 0.94626 0.90943 0.89220 0.89287 0.91012 0.91866 0.92296 0.93030 0.92575 0.92286 0.91878 Number of geometries 1 Number of calculations of the screened coulomb radii 1 The total number of SCF iterations 15. 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 -1.28 10.28 37.16 0.38 -0.90 16 2 C 0.06 0.63 6.44 37.16 0.24 0.87 16 3 O -0.37 -4.39 8.65 -49.66 -0.43 -4.82 16 4 C 0.11 1.19 1.42 -26.73 -0.04 1.16 16 5 H 0.07 0.76 7.65 -51.93 -0.40 0.36 16 6 C -0.14 -1.52 4.62 -27.89 -0.13 -1.65 16 7 C 0.52 6.96 7.71 -10.99 -0.08 6.87 16 8 O -0.54 -8.70 15.17 -8.87 -0.13 -8.84 16 9 N -0.72 -9.39 5.24 -51.50 -0.27 -9.66 16 10 C 0.11 1.54 3.37 -65.54 -0.22 1.32 16 11 H 0.10 1.32 7.74 -51.93 -0.40 0.92 16 12 C 0.04 0.61 7.49 38.22 0.29 0.90 16 13 O -0.34 -6.70 11.18 -35.23 -0.39 -7.09 16 14 C 0.05 0.99 1.75 -90.45 -0.16 0.83 16 15 C 0.11 2.29 8.20 -8.06 -0.07 2.22 16 16 N -0.60 -15.76 3.78 -184.59 -0.70 -16.46 16 17 C -0.21 -6.10 10.74 -15.06 -0.16 -6.26 16 18 H 0.08 2.24 7.83 -52.49 -0.41 1.83 16 19 C -0.01 -0.24 5.50 -17.43 -0.10 -0.34 16 20 N -0.92 -27.19 11.63 55.49 0.65 -26.55 16 21 Si 0.91 22.33 29.56 -169.99 -5.02 17.31 16 22 H -0.29 -7.09 7.11 56.52 0.40 -6.69 16 23 H -0.29 -7.11 7.11 56.52 0.40 -6.70 16 24 H -0.28 -6.69 7.11 56.52 0.40 -6.28 16 25 C 0.16 3.58 6.80 -7.92 -0.05 3.53 16 26 C -0.14 -1.98 5.97 -25.07 -0.15 -2.13 16 27 C -0.12 -1.01 2.88 -90.61 -0.26 -1.27 16 28 C -0.15 -1.21 8.46 37.16 0.31 -0.89 16 29 C -0.15 -1.20 8.95 37.16 0.33 -0.86 16 30 H 0.06 0.49 8.14 -51.93 -0.42 0.06 16 31 H 0.07 0.45 8.14 -51.93 -0.42 0.03 16 32 H 0.06 0.61 8.14 -51.93 -0.42 0.19 16 33 H 0.04 0.35 7.62 -51.93 -0.40 -0.05 16 34 H 0.05 0.57 8.14 -51.93 -0.42 0.15 16 35 H 0.10 0.99 6.80 -51.93 -0.35 0.64 16 36 H 0.11 1.01 6.34 -51.93 -0.33 0.68 16 37 H 0.41 5.11 8.62 -40.82 -0.35 4.76 16 38 H 0.08 1.28 8.14 -51.93 -0.42 0.86 16 39 H 0.06 0.88 8.14 -51.93 -0.42 0.45 16 40 H 0.05 0.94 8.14 -51.93 -0.42 0.52 16 41 H 0.04 0.81 8.13 -51.93 -0.42 0.39 16 42 H 0.25 7.21 8.31 -40.82 -0.34 6.87 16 43 H 0.04 0.80 7.95 -51.93 -0.41 0.39 16 44 H 0.07 1.86 7.34 -51.93 -0.38 1.48 16 45 H 0.09 1.07 8.13 -51.93 -0.42 0.64 16 46 H 0.09 1.14 7.81 -51.93 -0.41 0.73 16 47 H 0.07 0.60 7.63 -51.93 -0.40 0.20 16 48 H 0.06 0.57 7.66 -51.93 -0.40 0.18 16 49 H 0.06 0.47 6.85 -51.93 -0.36 0.12 16 50 H 0.05 0.38 8.14 -51.93 -0.42 -0.04 16 51 H 0.06 0.43 8.14 -51.93 -0.42 0.01 16 52 H 0.06 0.42 8.14 -51.93 -0.42 0.00 16 53 H 0.06 0.50 6.46 -51.93 -0.34 0.17 16 LS Contribution 417.39 15.07 6.29 6.29 Total: -1.00 -34.12 417.39 -9.41 -43.53 By element: Atomic # 1 Polarization: 12.40 SS G_CDS: -9.53 Total: 2.87 kcal Atomic # 6 Polarization: 3.28 SS G_CDS: 0.14 Total: 3.42 kcal Atomic # 7 Polarization: -52.34 SS G_CDS: -0.32 Total: -52.66 kcal Atomic # 8 Polarization: -19.80 SS G_CDS: -0.96 Total: -20.76 kcal Atomic # 14 Polarization: 22.33 SS G_CDS: -5.02 Total: 17.31 kcal Total LS contribution 6.29 Total: 6.29 kcal Total: -34.12 -9.41 -43.53 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. ZINC001755061288.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 -33.655 kcal (2) G-P(sol) polarization free energy of solvation -34.117 kcal (3) G-ENP(sol) elect.-nuc.-pol. free energy of system -67.772 kcal (4) G-CDS(sol) cavity-dispersion-solvent structure free energy -9.411 kcal (5) G-P-CDS(sol) = G-P(sol) + G-CDS(sol) = (2) + (4) -43.527 kcal (6) G-S(sol) free energy of system = (1) + (5) -77.183 kcal 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED Total computer time = 1.21 seconds