Wall clock time and date at job start Wed Apr 1 2020 04:54:57 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 1.50699 * 1 3 3 C 1.34669 * 126.59068 * 2 1 4 4 N 1.34126 * 108.01996 * 180.28291 * 3 2 1 5 5 C 1.30498 * 109.25564 * 359.73007 * 4 3 2 6 6 N 1.35044 * 108.70246 * 359.97438 * 5 4 3 7 7 C 1.46492 * 126.40201 * 180.02562 * 6 5 4 8 8 C 1.50698 * 109.47149 * 266.70751 * 7 6 5 9 9 O 1.21280 * 119.99847 * 355.73985 * 8 7 6 10 10 N 1.34779 * 120.00102 * 175.74198 * 8 7 6 11 11 C 1.46923 * 120.63273 * 0.44660 * 10 8 7 12 12 C 1.53185 * 108.77580 * 126.39058 * 11 10 8 13 13 C 1.53038 * 109.31357 * 54.63689 * 12 11 10 14 14 C 1.53033 * 109.53866 * 298.63533 * 13 12 11 15 15 C 1.46925 * 120.62917 * 180.44605 * 10 8 7 16 16 H 1.09001 * 109.70509 * 113.74981 * 15 10 8 17 17 C 1.53001 * 109.58807 * 353.39615 * 15 10 8 18 18 H 1.08999 * 109.87512 * 54.33251 * 17 15 10 19 19 C 1.54315 * 109.88271 * 293.15230 * 17 15 10 20 20 C 1.55158 * 102.94618 * 218.38798 * 19 17 15 21 21 C 1.54913 * 101.57802 * 35.50512 * 20 19 17 22 22 N 1.47028 * 109.88151 * 175.34291 * 17 15 10 23 23 C 1.36933 * 125.65079 * 298.09190 * 22 17 15 24 24 H 1.08001 * 120.00174 * 148.21170 * 23 22 17 25 25 C 1.38816 * 119.99945 * 328.21282 * 23 22 17 26 26 N 1.31621 * 119.99825 * 162.57036 * 25 23 22 27 27 Si 1.86800 * 120.00044 * 342.57077 * 25 23 22 28 28 H 1.48500 * 109.47319 * 87.08994 * 27 25 23 29 29 H 1.48495 * 109.47141 * 207.09018 * 27 25 23 30 30 H 1.48499 * 109.46807 * 327.09093 * 27 25 23 31 31 H 1.09001 * 109.47212 * 270.16821 * 1 2 3 32 32 H 1.08996 * 109.47474 * 30.16555 * 1 2 3 33 33 H 1.08995 * 109.47322 * 150.17252 * 1 2 3 34 34 H 1.08008 * 125.99005 * 359.97313 * 3 2 1 35 35 H 1.08001 * 125.65060 * 180.02562 * 5 4 3 36 36 H 1.08999 * 109.47523 * 146.70300 * 7 6 5 37 37 H 1.09008 * 109.47020 * 26.70457 * 7 6 5 38 38 H 1.08998 * 109.58563 * 6.60139 * 11 10 8 39 39 H 1.08997 * 109.70591 * 246.25058 * 11 10 8 40 40 H 1.09002 * 109.50274 * 294.68379 * 12 11 10 41 41 H 1.09001 * 109.52328 * 174.60621 * 12 11 10 42 42 H 1.08996 * 109.46009 * 178.61244 * 13 12 11 43 43 H 1.09000 * 109.46059 * 58.65723 * 13 12 11 44 44 H 1.09006 * 109.49853 * 301.40878 * 14 13 12 45 45 H 1.09005 * 109.52766 * 181.33139 * 14 13 12 46 46 H 1.09001 * 110.72377 * 336.75378 * 19 17 15 47 47 H 1.08999 * 110.72210 * 100.02508 * 19 17 15 48 48 H 1.09002 * 111.00694 * 153.57096 * 20 19 17 49 49 H 1.08992 * 111.00686 * 277.43288 * 20 19 17 50 50 H 1.09001 * 110.36517 * 204.15514 * 21 20 19 51 51 H 1.08998 * 110.37283 * 81.82665 * 21 20 19 52 52 H 0.96996 * 119.99663 * 180.02562 * 26 25 23 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 1.5070 0.0000 0.0000 3 6 2.3097 1.0813 0.0000 4 7 3.5812 0.6541 -0.0063 5 6 3.5968 -0.6508 -0.0044 6 7 2.3229 -1.0991 0.0038 7 6 1.8943 -2.4999 0.0090 8 6 1.6611 -2.9591 -1.4072 9 8 1.7606 -2.1716 -2.3242 10 7 1.3420 -4.2449 -1.6548 11 6 1.2082 -5.2084 -0.5537 12 6 -0.1607 -5.8882 -0.6570 13 6 -0.3178 -6.5007 -2.0506 14 6 -0.2467 -5.3952 -3.1065 15 6 1.1212 -4.7098 -3.0310 16 1 1.9011 -5.4188 -3.3090 17 6 1.1499 -3.5153 -3.9867 18 1 2.0772 -2.9577 -3.8552 19 6 -0.0610 -2.5977 -3.7163 20 6 -0.4813 -2.1481 -5.1406 21 6 -0.1873 -3.4238 -5.9688 22 7 1.0410 -3.9838 -5.3760 23 6 1.9352 -4.8003 -6.0154 24 1 1.5916 -5.4892 -6.7729 25 6 3.2835 -4.7424 -5.6899 26 7 4.0855 -5.7291 -6.0302 27 14 3.9595 -3.2644 -4.7691 28 1 3.8074 -3.4797 -3.3077 29 1 5.3975 -3.0922 -5.0971 30 1 3.2109 -2.0464 -5.1706 31 1 -0.3634 0.0030 1.0277 32 1 -0.3634 0.8884 -0.5164 33 1 -0.3634 -0.8915 -0.5111 34 1 1.9864 2.1118 -0.0004 35 1 4.4818 -1.2697 -0.0079 36 1 0.9699 -2.5949 0.5787 37 1 2.6686 -3.1150 0.4676 38 1 1.2860 -4.6865 0.4000 39 1 1.9953 -5.9591 -0.6246 40 1 -0.9465 -5.1508 -0.4930 41 1 -0.2354 -6.6729 0.0959 42 1 -1.2810 -7.0063 -2.1185 43 1 0.4826 -7.2201 -2.2235 44 1 -1.0316 -4.6624 -2.9195 45 1 -0.3822 -5.8286 -4.0974 46 1 -0.8656 -3.1529 -3.2341 47 1 0.2327 -1.7395 -3.1120 48 1 -1.5413 -1.8964 -5.1740 49 1 0.1283 -1.3116 -5.4820 50 1 -0.0205 -3.1669 -7.0149 51 1 -1.0098 -4.1331 -5.8780 52 1 5.0275 -5.6888 -5.8024 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 ZINC001025253659.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 04:54:57 Heat of formation + Delta-G solvation = 98.589412 kcal Electronic energy + Delta-G solvation = -34081.658154 eV Core-core repulsion = 30084.805193 eV Total energy + Delta-G solvation = -3996.852960 eV No. of doubly occupied orbitals = 66 Molecular weight (most abundant/longest-lived isotopes) = 346.211 amu Computer time = 0.93 seconds Orbital eigenvalues (eV) -42.14450 -40.67602 -37.62899 -36.99006 -34.11861 -32.80849 -32.47270 -31.96859 -31.42460 -29.85900 -28.19416 -27.21396 -26.41803 -24.81263 -24.17217 -22.98236 -21.47800 -21.28761 -20.81855 -19.94453 -19.66239 -18.64774 -17.60769 -17.08409 -16.19627 -15.75668 -15.57259 -15.45756 -14.94651 -14.75723 -14.40015 -14.25832 -13.98955 -13.82013 -13.53088 -13.43267 -13.16596 -13.05342 -12.99009 -12.84471 -12.78967 -12.49469 -12.41820 -11.92915 -11.85114 -11.51810 -11.48207 -11.04657 -10.94320 -10.83513 -10.62333 -10.43946 -10.34248 -10.12705 -9.90616 -9.85240 -9.81579 -9.68673 -9.35319 -8.84532 -8.44958 -8.23235 -8.13846 -6.73237 -5.95035 -3.33879 1.97259 2.57410 2.64668 3.15598 3.27517 3.44470 3.56440 3.71878 4.32940 4.46942 4.59287 4.61469 4.70799 4.74479 4.78711 4.85401 5.00113 5.09768 5.16515 5.26059 5.33205 5.38366 5.41016 5.42611 5.44375 5.53925 5.70418 5.74036 5.74854 5.78907 5.80365 5.85437 5.91623 6.05480 6.18632 6.26563 6.27831 6.31562 6.37787 6.49828 6.57061 6.64312 6.74193 6.79731 6.90676 6.91822 6.97840 7.16526 7.30263 7.54502 7.94230 8.13192 8.32774 8.36285 8.93101 9.72594 10.31390 11.20520 Molecular weight = 346.21amu Principal moments of inertia in cm(-1) A = 0.010305 B = 0.005423 C = 0.004753 Principal moments of inertia in units of 10**(-40)*gram-cm**2 A = 2716.539485 B = 5162.282415 C = 5889.876357 Net atomic charges, atomic populations, and dipole contributions calculated with CM2 Atom NO. Type Charge No. of electrons 1 C -0.075 4.075 2 C -0.013 4.013 3 C -0.032 4.032 4 N -0.492 5.492 5 C 0.189 3.811 6 N -0.440 5.440 7 C 0.084 3.916 8 C 0.478 3.522 9 O -0.490 6.490 10 N -0.598 5.598 11 C 0.104 3.896 12 C -0.131 4.131 13 C -0.121 4.121 14 C -0.122 4.122 15 C 0.138 3.862 16 H 0.085 0.915 17 C 0.146 3.854 18 H 0.088 0.912 19 C -0.127 4.127 20 C -0.138 4.138 21 C 0.130 3.870 22 N -0.607 5.607 23 C -0.243 4.243 24 H 0.084 0.916 25 C 0.031 3.969 26 N -0.909 5.909 27 Si 0.897 3.103 28 H -0.285 1.285 29 H -0.312 1.312 30 H -0.275 1.275 31 H 0.068 0.932 32 H 0.081 0.919 33 H 0.063 0.937 34 H 0.166 0.834 35 H 0.200 0.800 36 H 0.115 0.885 37 H 0.117 0.883 38 H 0.075 0.925 39 H 0.072 0.928 40 H 0.064 0.936 41 H 0.071 0.929 42 H 0.060 0.940 43 H 0.065 0.935 44 H 0.063 0.937 45 H 0.084 0.916 46 H 0.058 0.942 47 H 0.086 0.914 48 H 0.056 0.944 49 H 0.061 0.939 50 H 0.045 0.955 51 H 0.022 0.978 52 H 0.262 0.738 For the charges calculated by CM2: Dipole moment (debyes) X Y Z Total from point charges -10.861 2.806 17.302 20.621 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 -0.133 4.133 2 C -0.127 4.127 3 C -0.179 4.179 4 N -0.210 5.210 5 C -0.093 4.093 6 N -0.123 5.123 7 C -0.043 4.043 8 C 0.264 3.736 9 O -0.365 6.365 10 N -0.333 5.333 11 C -0.020 4.020 12 C -0.169 4.169 13 C -0.159 4.159 14 C -0.160 4.160 15 C 0.035 3.965 16 H 0.103 0.897 17 C 0.040 3.960 18 H 0.104 0.896 19 C -0.165 4.165 20 C -0.176 4.176 21 C 0.005 3.995 22 N -0.333 5.333 23 C -0.371 4.371 24 H 0.101 0.899 25 C -0.169 4.169 26 N -0.552 5.552 27 Si 0.730 3.270 28 H -0.212 1.212 29 H -0.241 1.241 30 H -0.201 1.201 31 H 0.087 0.913 32 H 0.100 0.900 33 H 0.082 0.918 34 H 0.183 0.817 35 H 0.217 0.783 36 H 0.133 0.867 37 H 0.135 0.865 38 H 0.093 0.907 39 H 0.091 0.909 40 H 0.082 0.918 41 H 0.090 0.910 42 H 0.079 0.921 43 H 0.083 0.917 44 H 0.081 0.919 45 H 0.103 0.897 46 H 0.076 0.924 47 H 0.104 0.896 48 H 0.075 0.925 49 H 0.080 0.920 50 H 0.063 0.937 51 H 0.040 0.960 52 H 0.072 0.928 Dipole moment (debyes) X Y Z Total from point charges -9.919 3.480 16.722 19.751 hybrid contribution -0.078 -0.083 0.492 0.505 sum -9.997 3.398 17.214 20.194 Atomic orbital electron populations 1.20188 0.87492 1.03628 1.02029 1.21160 0.94416 0.86665 1.10445 1.21964 0.88450 0.98243 1.09222 1.70246 1.22468 1.08723 1.19547 1.24832 0.86999 0.91820 1.05632 1.44893 1.07408 1.05362 1.54663 1.21777 1.03860 0.81273 0.97360 1.20495 0.79726 0.82928 0.90478 1.90788 1.48548 1.53745 1.43374 1.48207 1.68672 1.07867 1.08569 1.21762 0.98312 0.92711 0.89186 1.21885 0.96633 1.00020 0.98352 1.21547 1.01826 0.98412 0.94117 1.21947 0.97166 0.97087 0.99812 1.22005 0.97173 0.99114 0.78241 0.89690 1.22002 0.99298 0.90847 0.83810 0.89580 1.23094 0.96800 0.99923 0.96633 1.22781 0.99235 0.98676 0.96950 1.21689 0.89723 0.91905 0.96168 1.44935 1.24521 1.57292 1.06568 1.18564 0.86138 1.12361 1.20031 0.89873 1.25288 0.95753 0.97097 0.98714 1.69810 1.05068 1.30619 1.49705 0.86745 0.75953 0.85166 0.79139 1.21222 1.24105 1.20140 0.91284 0.89970 0.91799 0.81655 0.78315 0.86694 0.86459 0.90655 0.90923 0.91760 0.91015 0.92097 0.91662 0.91864 0.89749 0.92373 0.89584 0.92501 0.92044 0.93695 0.95981 0.92840 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 -0.08 -0.73 10.05 36.01 0.36 -0.37 16 2 C -0.01 -0.17 6.94 -81.60 -0.57 -0.73 16 3 C -0.03 -0.46 11.79 -17.81 -0.21 -0.67 16 4 N -0.49 -8.12 11.25 -14.66 -0.16 -8.28 16 5 C 0.19 2.78 12.56 -90.38 -1.14 1.64 16 6 N -0.44 -5.88 2.24 -115.28 -0.26 -6.13 16 7 C 0.08 0.91 4.64 -5.20 -0.02 0.89 16 8 C 0.48 7.40 7.24 -10.99 -0.08 7.32 16 9 O -0.49 -9.75 9.02 5.56 0.05 -9.70 16 10 N -0.60 -8.95 2.94 -165.23 -0.49 -9.44 16 11 C 0.10 1.06 6.31 -3.72 -0.02 1.04 16 12 C -0.13 -1.22 6.08 -26.62 -0.16 -1.39 16 13 C -0.12 -1.49 5.88 -26.69 -0.16 -1.64 16 14 C -0.12 -1.94 4.96 -26.62 -0.13 -2.07 16 15 C 0.14 2.61 2.55 -67.60 -0.17 2.44 16 16 H 0.09 1.95 7.60 -51.93 -0.39 1.56 16 17 C 0.15 3.18 1.06 -66.95 -0.07 3.11 16 18 H 0.09 2.16 1.02 -52.36 -0.05 2.10 16 19 C -0.13 -2.37 5.06 -24.90 -0.13 -2.50 16 20 C -0.14 -2.54 7.09 -24.58 -0.17 -2.72 16 21 C 0.13 2.70 7.23 -2.52 -0.02 2.68 16 22 N -0.61 -14.70 2.37 -162.57 -0.38 -15.09 16 23 C -0.24 -6.85 10.04 -15.06 -0.15 -7.00 16 24 H 0.08 2.50 8.06 -52.49 -0.42 2.08 16 25 C 0.03 0.91 5.19 -17.43 -0.09 0.82 16 26 N -0.91 -27.94 13.97 55.49 0.78 -27.16 16 27 Si 0.90 24.69 24.35 -169.99 -4.14 20.55 16 28 H -0.28 -7.56 6.63 56.52 0.37 -7.18 16 29 H -0.31 -8.79 7.11 56.52 0.40 -8.39 16 30 H -0.28 -7.97 7.02 56.52 0.40 -7.58 16 31 H 0.07 0.52 8.14 -51.93 -0.42 0.10 16 32 H 0.08 0.73 8.14 -51.93 -0.42 0.31 16 33 H 0.06 0.66 7.96 -51.93 -0.41 0.24 16 34 H 0.17 1.97 8.06 -52.48 -0.42 1.55 16 35 H 0.20 2.40 8.06 -52.49 -0.42 1.97 16 36 H 0.12 0.89 7.71 -51.93 -0.40 0.49 16 37 H 0.12 0.96 7.75 -51.92 -0.40 0.56 16 38 H 0.08 0.51 5.95 -51.93 -0.31 0.20 16 39 H 0.07 0.76 8.14 -51.93 -0.42 0.33 16 40 H 0.06 0.58 8.14 -51.93 -0.42 0.16 16 41 H 0.07 0.52 8.14 -51.93 -0.42 0.10 16 42 H 0.06 0.66 8.14 -51.93 -0.42 0.24 16 43 H 0.06 0.86 8.14 -51.93 -0.42 0.44 16 44 H 0.06 0.96 5.55 -51.93 -0.29 0.67 16 45 H 0.08 1.55 7.95 -51.93 -0.41 1.13 16 46 H 0.06 0.98 5.24 -51.93 -0.27 0.70 16 47 H 0.09 1.67 5.61 -51.91 -0.29 1.38 16 48 H 0.06 0.87 8.14 -51.93 -0.42 0.45 16 49 H 0.06 1.21 8.14 -51.93 -0.42 0.79 16 50 H 0.04 0.94 8.14 -51.93 -0.42 0.52 16 51 H 0.02 0.43 8.14 -51.93 -0.42 0.01 16 52 H 0.26 7.73 8.31 -40.82 -0.34 7.39 16 LS Contribution 385.97 15.07 5.82 5.82 Total: -1.00 -36.21 385.97 -10.05 -46.26 By element: Atomic # 1 Polarization: 10.65 SS G_CDS: -8.32 Total: 2.33 kcal Atomic # 6 Polarization: 3.78 SS G_CDS: -2.93 Total: 0.85 kcal Atomic # 7 Polarization: -65.58 SS G_CDS: -0.52 Total: -66.10 kcal Atomic # 8 Polarization: -9.75 SS G_CDS: 0.05 Total: -9.70 kcal Atomic # 14 Polarization: 24.69 SS G_CDS: -4.14 Total: 20.55 kcal Total LS contribution 5.82 Total: 5.82 kcal Total: -36.21 -10.05 -46.26 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. ZINC001025253659.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 144.850 kcal (2) G-P(sol) polarization free energy of solvation -36.213 kcal (3) G-ENP(sol) elect.-nuc.-pol. free energy of system 108.637 kcal (4) G-CDS(sol) cavity-dispersion-solvent structure free energy -10.047 kcal (5) G-P-CDS(sol) = G-P(sol) + G-CDS(sol) = (2) + (4) -46.261 kcal (6) G-S(sol) free energy of system = (1) + (5) 98.589 kcal 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED Total computer time = 0.93 seconds