Wall clock time and date at job start Sun Mar 7 2021 06:19:21 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= 0 * AM1 - THE AM1 HAMILTONIAN TO BE USED * SM5.42R - SM5.42R CALCULATIONS WILL BE PERFORMED * - CHARGE MODEL 2 WILL BE USED (CM2A) * - THE SOLVENT IS WATER ******************************************************************************* 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 N 1.46499 * 1 3 3 C 1.34664 * 124.84980 * 2 1 4 4 C 1.36774 * 108.39265 * 179.82889 * 3 2 1 5 5 C 1.47262 * 126.93802 * 180.15993 * 4 3 2 6 6 O 1.21636 * 119.99886 * 180.30570 * 5 4 3 7 7 N 1.34773 * 120.00078 * 0.30550 * 5 4 3 8 8 C 1.46506 * 119.99745 * 179.97438 * 7 5 4 9 9 C 1.53006 * 109.46973 * 179.97438 * 8 7 5 10 10 C 1.52995 * 109.47163 * 179.97438 * 9 8 7 11 11 H 1.09002 * 112.84967 * 43.80919 * 10 9 8 12 12 C 1.53780 * 113.61578 * 175.00286 * 10 9 8 13 13 C 1.53780 * 87.08193 * 139.98184 * 12 10 9 14 14 H 1.09001 * 113.61437 * 220.01561 * 13 12 10 15 15 N 1.46497 * 113.61301 * 89.20123 * 13 12 10 16 16 C 1.34780 * 120.00377 * 154.99901 * 15 13 12 17 17 O 1.21512 * 119.99704 * 0.02562 * 16 15 13 18 18 O 1.34632 * 120.00332 * 180.02562 * 16 15 13 19 19 C 1.45203 * 117.00105 * 180.02562 * 18 16 15 20 20 C 1.53005 * 109.47186 * 59.99596 * 19 18 16 21 21 C 1.53001 * 109.47260 * 179.97438 * 19 18 16 22 22 C 1.53003 * 109.46860 * 300.00096 * 19 18 16 23 23 C 1.53778 * 87.08242 * 334.57150 * 13 12 10 24 24 C 1.46686 * 106.11767 * 0.41460 * 4 3 2 25 25 C 1.34489 * 106.33410 * 359.74157 * 24 4 3 26 26 C 1.50694 * 125.57301 * 180.02562 * 25 24 4 27 27 O 1.42898 * 109.47414 * 209.97884 * 26 25 24 28 28 Si 1.86299 * 109.47209 * 329.97821 * 26 25 24 29 29 H 1.09002 * 109.47391 * 269.69950 * 1 2 3 30 30 H 1.09001 * 109.46813 * 149.70006 * 1 2 3 31 31 H 1.09004 * 109.47041 * 29.70134 * 1 2 3 32 32 H 1.07997 * 125.80164 * 359.97438 * 3 2 1 33 33 H 0.96993 * 120.00223 * 0.02562 * 7 5 4 34 34 H 1.08994 * 109.47470 * 299.99917 * 8 7 5 35 35 H 1.09006 * 109.46873 * 59.99986 * 8 7 5 36 36 H 1.08994 * 109.47241 * 300.00409 * 9 8 7 37 37 H 1.09006 * 109.46663 * 60.00061 * 9 8 7 38 38 H 1.08998 * 113.61501 * 254.53361 * 12 10 9 39 39 H 1.08999 * 113.60928 * 25.35012 * 12 10 9 40 40 H 0.97001 * 120.00345 * 334.99721 * 15 13 12 41 41 H 1.08997 * 109.46743 * 60.00294 * 20 19 18 42 42 H 1.08993 * 109.46951 * 180.02562 * 20 19 18 43 43 H 1.09000 * 109.46880 * 300.00725 * 20 19 18 44 44 H 1.09000 * 109.46610 * 60.00021 * 21 19 18 45 45 H 1.08996 * 109.46776 * 179.97438 * 21 19 18 46 46 H 1.08994 * 109.46926 * 299.99728 * 21 19 18 47 47 H 1.08996 * 109.47625 * 59.99513 * 22 19 18 48 48 H 1.08993 * 109.47101 * 180.02562 * 22 19 18 49 49 H 1.09002 * 109.46724 * 299.99672 * 22 19 18 50 50 H 1.09005 * 113.61210 * 270.88759 * 23 13 12 51 51 H 1.08992 * 113.61789 * 139.98479 * 23 13 12 52 52 H 1.07996 * 126.83688 * 179.74874 * 24 4 3 53 53 H 1.09004 * 109.46846 * 89.97959 * 26 25 24 54 54 H 0.96705 * 114.00064 * 59.99916 * 27 26 25 55 55 H 1.48505 * 109.99798 * 179.97438 * 28 26 25 56 56 H 1.48493 * 110.00201 * 301.31928 * 28 26 25 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 7 1.4650 0.0000 0.0000 3 6 2.2345 1.1051 0.0000 4 6 3.5462 0.7177 0.0039 5 6 4.7284 1.5958 0.0086 6 8 5.8447 1.1128 0.0061 7 7 4.5733 2.9345 0.0156 8 6 5.7495 3.8081 0.0208 9 6 5.2987 5.2702 0.0277 10 6 6.5270 6.1825 0.0338 11 1 7.2998 5.8565 -0.6623 12 6 6.1847 7.6772 -0.0818 13 6 7.2946 7.9308 0.9520 14 1 7.0393 8.6923 1.6888 15 7 8.6164 8.1373 0.3550 16 6 9.5533 8.8424 1.0196 17 8 9.3018 9.3063 2.1142 18 8 10.7679 9.0327 0.4708 19 6 11.7274 9.8012 1.2435 20 6 11.9849 9.1006 2.5791 21 6 13.0395 9.9104 0.4641 22 6 11.1689 11.2021 1.5018 23 6 7.0566 6.4933 1.4437 24 6 3.5375 -0.7492 -0.0038 25 6 2.2447 -1.1198 -0.0058 26 6 1.7398 -2.5396 -0.0127 27 8 0.4807 -2.5942 -0.6863 28 14 2.9647 -3.6300 -0.8966 29 1 -0.3634 -0.0054 1.0276 30 1 -0.3633 -0.8873 -0.5185 31 1 -0.3633 0.8927 -0.5092 32 1 1.8767 2.1241 -0.0004 33 1 3.6832 3.3197 0.0179 34 1 6.3471 3.6076 0.9100 35 1 6.3480 3.6169 -0.8700 36 1 4.7013 5.4705 -0.8617 37 1 4.7000 5.4616 0.9182 38 1 6.3979 8.0994 -1.0638 39 1 5.1861 7.9255 0.2780 40 1 8.8174 7.7667 -0.5185 41 1 12.3827 8.1027 2.3950 42 1 12.7047 9.6778 3.1592 43 1 11.0502 9.0224 3.1344 44 1 12.8562 10.4094 -0.4876 45 1 13.7595 10.4877 1.0439 46 1 13.4370 8.9123 0.2805 47 1 10.2343 11.1240 2.0572 48 1 11.8893 11.7792 2.0814 49 1 10.9855 11.7012 0.5503 50 1 6.2969 6.4182 2.2217 51 1 7.9736 5.9597 1.6932 52 1 4.3980 -1.4017 -0.0072 53 1 1.6183 -2.8870 1.0133 54 1 0.5138 -2.2986 -1.6065 55 1 2.4785 -5.0332 -0.9097 56 1 3.1632 -3.1478 -2.2870 There are 72 doubly filled levels RHF calculation, no. of doubly occupied orbitals= 72 No. of singly occupied orbitals= 1 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=0 AM1 1SCF TLIMIT=15 GEO-OK SM5.42R & SOLVNT=WATER s_22_16498394_13287730.mol2 56 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED SCF FIELD WAS ACHIEVED Wall clock time and date at job start Sun Mar 7 2021 06:19:21 Heat of formation + Delta-G solvation = -77.027143 kcal Electronic energy + Delta-G solvation = -34243.703458 eV Core-core repulsion = 29542.266579 eV Total energy + Delta-G solvation = -4701.436879 eV No. of doubly occupied orbitals = 72 and no. of open levels = 1 Molecular weight (most abundant/longest-lived isotopes) = 380.219 amu Computer time = 1.29 seconds Orbital eigenvalues (eV) -42.44441 -41.94696 -40.59339 -40.05392 -38.00427 -37.94005 -36.23459 -35.32986 -34.16921 -33.72818 -32.03308 -30.80439 -28.38945 -28.32263 -27.66676 -26.71533 -26.52541 -25.66447 -24.03193 -23.19629 -22.60770 -21.18636 -20.99167 -20.60582 -20.07042 -19.31953 -18.99951 -17.60944 -17.46886 -17.22999 -17.03033 -16.83776 -16.73696 -16.50386 -16.38291 -15.80118 -15.76119 -15.43857 -15.42044 -15.24440 -15.10783 -14.76571 -14.64627 -14.45727 -14.30781 -14.10778 -13.74232 -13.45939 -13.37368 -13.36705 -13.21381 -13.15708 -13.00264 -12.93886 -12.88942 -12.69501 -12.50511 -12.35556 -12.33368 -12.21623 -11.97639 -11.88535 -11.43654 -11.38799 -11.15711 -11.11475 -10.92520 -10.89117 -10.16128 -10.11091 -9.54423 -9.19991 -4.89493 0.75563 1.03201 1.13281 1.45237 1.62840 1.71253 1.80792 2.07007 2.33818 2.58403 3.11342 3.16046 3.52788 3.53669 3.57648 3.72200 3.77156 3.88048 3.88744 3.91996 3.92409 3.96523 4.17334 4.33383 4.38518 4.45738 4.46013 4.47047 4.52269 4.55204 4.58854 4.59302 4.69330 4.74362 4.79253 4.81540 4.84695 4.85607 4.86972 4.91331 4.94220 4.96516 5.00019 5.06341 5.10243 5.15603 5.24998 5.26315 5.29139 5.33902 5.51341 5.52370 5.65485 5.66784 5.97297 6.24269 6.32354 6.37390 6.68070 7.32040 7.37501 Net atomic charges, atomic populations, and dipole contributions calculated with CM2 Atom NO. Type Charge No. of electrons 1 C 0.046 3.954 2 N -0.427 5.427 3 C 0.071 3.929 4 C -0.263 4.263 5 C 0.584 3.416 6 O -0.597 6.597 7 N -0.717 5.717 8 C 0.121 3.879 9 C -0.108 4.108 10 C -0.101 4.101 11 H 0.093 0.907 12 C -0.123 4.123 13 C 0.124 3.876 14 H 0.090 0.910 15 N -0.684 5.684 16 C 0.645 3.355 17 O -0.594 6.594 18 O -0.370 6.370 19 C 0.127 3.873 20 C -0.180 4.180 21 C -0.138 4.138 22 C -0.180 4.180 23 C -0.149 4.149 24 C -0.156 4.156 25 C -0.024 4.024 26 C -0.043 4.043 27 O -0.538 6.538 28 Si 0.771 3.229 29 H 0.079 0.921 30 H 0.110 0.890 31 H 0.105 0.895 32 H 0.209 0.791 33 H 0.413 0.587 34 H 0.050 0.950 35 H 0.053 0.947 36 H 0.089 0.911 37 H 0.086 0.914 38 H 0.084 0.916 39 H 0.116 0.884 40 H 0.416 0.584 41 H 0.060 0.940 42 H 0.087 0.913 43 H 0.063 0.937 44 H 0.070 0.930 45 H 0.099 0.901 46 H 0.068 0.932 47 H 0.063 0.937 48 H 0.087 0.913 49 H 0.062 0.938 50 H 0.103 0.897 51 H 0.055 0.945 52 H 0.153 0.847 53 H 0.132 0.868 54 H 0.388 0.612 55 H -0.287 1.287 56 H -0.294 1.294 For the charges calculated by CM2: Dipole moment (debyes) X Y Z Total from point charges -5.763 3.001 -2.239 6.872 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 -0.094 4.094 2 N -0.100 5.100 3 C -0.066 4.066 4 C -0.273 4.273 5 C 0.374 3.626 6 O -0.479 6.479 7 N -0.369 5.369 8 C -0.002 4.002 9 C -0.146 4.146 10 C -0.120 4.120 11 H 0.111 0.889 12 C -0.161 4.161 13 C 0.020 3.980 14 H 0.108 0.892 15 N -0.343 5.343 16 C 0.398 3.602 17 O -0.485 6.485 18 O -0.285 6.285 19 C 0.091 3.909 20 C -0.237 4.237 21 C -0.195 4.195 22 C -0.237 4.237 23 C -0.188 4.188 24 C -0.180 4.180 25 C -0.133 4.133 26 C -0.152 4.152 27 O -0.346 6.346 28 Si 0.675 3.325 29 H 0.097 0.903 30 H 0.128 0.872 31 H 0.124 0.876 32 H 0.225 0.775 33 H 0.250 0.750 34 H 0.068 0.932 35 H 0.072 0.928 36 H 0.107 0.893 37 H 0.104 0.896 38 H 0.102 0.898 39 H 0.134 0.866 40 H 0.253 0.747 41 H 0.079 0.921 42 H 0.106 0.894 43 H 0.082 0.918 44 H 0.089 0.911 45 H 0.117 0.883 46 H 0.087 0.913 47 H 0.082 0.918 48 H 0.106 0.894 49 H 0.081 0.919 50 H 0.121 0.879 51 H 0.074 0.926 52 H 0.171 0.829 53 H 0.150 0.850 54 H 0.238 0.762 55 H -0.214 1.214 56 H -0.221 1.221 Dipole moment (debyes) X Y Z Total from point charges -5.453 2.160 -1.789 6.132 hybrid contribution -0.739 0.386 -0.792 1.150 sum -6.192 2.546 -2.581 7.175 Atomic orbital electron populations 1.22739 0.74623 1.07054 1.04951 1.43733 1.08035 1.04614 1.53660 1.22427 0.89006 0.93250 1.01914 1.20351 0.92271 0.93996 1.20702 1.17723 0.87778 0.82347 0.74728 1.90754 1.27832 1.76297 1.53008 1.45698 1.10850 1.04903 1.75445 1.21340 0.87692 0.90058 1.01129 1.21701 0.97823 0.90680 1.04364 1.22485 0.97792 0.94816 0.96886 0.88867 1.23352 0.98541 0.94900 0.99289 1.21937 0.80498 0.98129 0.97414 0.89215 1.44406 1.11631 1.55467 1.22783 1.18343 0.80835 0.78290 0.82707 1.90900 1.81154 1.54802 1.21601 1.86310 1.21888 1.70189 1.50103 1.22361 0.87148 0.90133 0.91273 1.22475 1.03494 1.01140 0.96640 1.21894 0.92928 1.03744 1.00923 1.22471 1.03166 0.95151 1.02889 1.23587 1.01701 0.95421 0.98085 1.21818 0.95588 0.93622 1.07015 1.20801 0.90436 0.89826 1.12267 1.24716 0.92416 0.94046 1.04060 1.86537 1.29561 1.88453 1.30093 0.93299 0.84632 0.74707 0.79866 0.90289 0.87169 0.87611 0.77482 0.74967 0.93161 0.92847 0.89251 0.89588 0.89772 0.86595 0.74739 0.92088 0.89386 0.91836 0.91103 0.88254 0.91273 0.91780 0.89419 0.91860 0.87889 0.92613 0.82908 0.85011 0.76218 1.21393 1.22102 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 0.05 -0.39 10.71 127.77 1.37 0.97 16 2 N -0.43 1.21 3.09 -533.23 -1.65 -0.43 16 3 C 0.07 -0.23 10.83 83.92 0.91 0.67 16 4 C -0.26 -1.12 6.29 -19.04 -0.12 -1.24 16 5 C 0.58 4.63 7.81 86.62 0.68 5.30 16 6 O -0.60 -10.57 16.97 -4.14 -0.07 -10.64 16 7 N -0.72 0.50 5.55 -466.50 -2.59 -2.09 16 8 C 0.12 -0.11 5.67 86.38 0.49 0.38 16 9 C -0.11 0.88 5.17 30.59 0.16 1.04 16 10 C -0.10 0.67 3.53 -10.27 -0.04 0.64 16 11 H 0.09 -0.56 8.13 -2.39 -0.02 -0.58 16 12 C -0.12 0.94 7.39 31.12 0.23 1.17 16 13 C 0.12 -0.18 4.32 45.52 0.20 0.02 16 14 H 0.09 0.21 7.46 -2.39 -0.02 0.19 16 15 N -0.68 -0.73 5.27 -567.62 -2.99 -3.72 16 16 C 0.64 4.94 8.06 129.79 1.05 5.98 16 17 O -0.59 -7.71 11.48 19.80 0.23 -7.48 16 18 O -0.37 -2.42 9.94 -55.42 -0.55 -2.97 16 19 C 0.13 0.49 1.13 -10.79 -0.01 0.48 16 20 C -0.18 -0.79 8.37 71.98 0.60 -0.19 16 21 C -0.14 0.17 8.85 71.98 0.64 0.81 16 22 C -0.18 -0.68 8.37 71.98 0.60 -0.08 16 23 C -0.15 0.42 7.43 31.12 0.23 0.65 16 24 C -0.16 -0.72 9.49 23.62 0.22 -0.50 16 25 C -0.02 -0.01 6.14 40.98 0.25 0.24 16 26 C -0.04 0.09 2.98 71.23 0.21 0.30 16 27 O -0.54 1.42 9.95 -148.98 -1.48 -0.06 16 28 Si 0.77 -0.60 31.12 68.60 2.13 1.54 16 29 H 0.08 -0.68 8.14 -2.39 -0.02 -0.70 16 30 H 0.11 -0.90 4.93 -2.39 -0.01 -0.91 16 31 H 0.11 -1.39 8.13 -2.38 -0.02 -1.41 16 32 H 0.21 -2.54 7.45 -2.91 -0.02 -2.56 16 33 H 0.41 -3.41 7.42 -92.71 -0.69 -4.10 16 34 H 0.05 0.16 8.14 -2.39 -0.02 0.14 16 35 H 0.05 0.12 8.14 -2.38 -0.02 0.10 16 36 H 0.09 -0.95 8.14 -2.39 -0.02 -0.97 16 37 H 0.09 -0.86 7.84 -2.38 -0.02 -0.88 16 38 H 0.08 -0.70 8.14 -2.39 -0.02 -0.72 16 39 H 0.12 -1.19 8.10 -2.39 -0.02 -1.21 16 40 H 0.42 -1.30 8.81 -92.71 -0.82 -2.12 16 41 H 0.06 0.24 8.14 -2.39 -0.02 0.22 16 42 H 0.09 0.06 8.14 -2.39 -0.02 0.04 16 43 H 0.06 0.62 5.88 -2.39 -0.01 0.61 16 44 H 0.07 -0.12 8.14 -2.39 -0.02 -0.14 16 45 H 0.10 -0.46 8.14 -2.39 -0.02 -0.48 16 46 H 0.07 -0.09 8.14 -2.39 -0.02 -0.10 16 47 H 0.06 0.58 5.88 -2.39 -0.01 0.57 16 48 H 0.09 0.02 8.14 -2.39 -0.02 0.00 16 49 H 0.06 0.18 8.14 -2.39 -0.02 0.17 16 50 H 0.10 -0.45 7.90 -2.38 -0.02 -0.46 16 51 H 0.06 0.07 8.14 -2.39 -0.02 0.05 16 52 H 0.15 0.62 6.89 -2.91 -0.02 0.60 16 53 H 0.13 -0.51 7.96 -2.39 -0.02 -0.53 16 54 H 0.39 -2.88 8.38 -74.05 -0.62 -3.50 16 55 H -0.29 -1.40 7.11 99.48 0.71 -0.70 16 56 H -0.29 -1.61 7.11 99.48 0.71 -0.90 16 Total: 0.00 -28.97 447.12 -0.48 -29.45 By element: Atomic # 1 Polarization: -19.08 SS G_CDS: -1.18 Total: -20.26 kcal Atomic # 6 Polarization: 8.99 SS G_CDS: 7.67 Total: 16.66 kcal Atomic # 7 Polarization: 0.98 SS G_CDS: -7.22 Total: -6.24 kcal Atomic # 8 Polarization: -19.27 SS G_CDS: -1.88 Total: -21.15 kcal Atomic # 14 Polarization: -0.60 SS G_CDS: 2.13 Total: 1.54 kcal Total: -28.97 -0.48 -29.45 kcal The number of atoms in the molecule is 56 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. s_22_16498394_13287730.mol2 56 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 -47.579 kcal (2) G-P(sol) polarization free energy of solvation -28.971 kcal (3) G-ENP(sol) elect.-nuc.-pol. free energy of system -76.550 kcal (4) G-CDS(sol) cavity-dispersion-solvent structure free energy -0.477 kcal (5) G-P-CDS(sol) = G-P(sol) + G-CDS(sol) = (2) + (4) -29.449 kcal (6) G-S(sol) free energy of system = (1) + (5) -77.027 kcal 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED Total computer time = 1.29 seconds