Wall clock time and date at job start Thu Mar 4 2021 15:23:42 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= 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 C 1.50700 * 1 3 3 C 1.36414 * 125.80382 * 2 1 4 4 C 1.47375 * 127.18949 * 359.97438 * 3 2 1 5 5 O 1.21610 * 120.00322 * 359.43281 * 4 3 2 6 6 N 1.34784 * 119.99840 * 179.70617 * 4 3 2 7 7 C 1.46499 * 119.99893 * 179.72634 * 6 4 3 8 8 C 1.53003 * 109.46708 * 180.02562 * 7 6 4 9 9 F 1.39897 * 112.85275 * 50.32849 * 8 7 6 10 10 C 1.53785 * 113.61057 * 181.52736 * 8 7 6 11 11 C 1.53791 * 87.07923 * 139.97717 * 10 8 7 12 12 H 1.09001 * 113.61420 * 220.01741 * 11 10 8 13 13 C 1.52998 * 113.61010 * 89.19912 * 11 10 8 14 14 N 1.46503 * 109.46728 * 175.00130 * 13 11 10 15 15 C 1.34780 * 120.00015 * 180.02562 * 14 13 11 16 16 O 1.21512 * 119.99668 * 359.97438 * 15 14 13 17 17 O 1.34637 * 119.99995 * 179.97438 * 15 14 13 18 18 C 1.45199 * 116.99974 * 179.97438 * 17 15 14 19 19 C 1.52999 * 109.47070 * 60.00003 * 18 17 15 20 20 C 1.52998 * 109.47025 * 180.02562 * 18 17 15 21 21 C 1.53001 * 109.47125 * 299.99944 * 18 17 15 22 22 C 1.53787 * 113.61067 * 279.13001 * 8 7 6 23 23 C 1.47024 * 105.61607 * 179.73601 * 3 2 1 24 24 C 1.34179 * 105.94911 * 0.22593 * 23 3 2 25 25 C 1.50709 * 125.43084 * 180.02562 * 24 23 3 26 26 O 1.42894 * 109.47075 * 64.99968 * 25 24 23 27 27 Si 1.86305 * 109.46841 * 185.00032 * 25 24 23 28 28 O 1.33658 * 125.80002 * 180.11756 * 2 1 3 29 29 H 1.09009 * 109.46980 * 89.99806 * 1 2 3 30 30 H 1.08998 * 109.47576 * 209.99851 * 1 2 3 31 31 H 1.08999 * 109.47013 * 330.00474 * 1 2 3 32 32 H 0.97005 * 119.99846 * 359.72422 * 6 4 3 33 33 H 1.08998 * 109.47134 * 299.99552 * 7 6 4 34 34 H 1.08994 * 109.47397 * 59.99843 * 7 6 4 35 35 H 1.08995 * 113.61294 * 254.52512 * 10 8 7 36 36 H 1.09003 * 113.61477 * 25.34594 * 10 8 7 37 37 H 1.08998 * 109.47430 * 294.99830 * 13 11 10 38 38 H 1.09001 * 109.47197 * 55.00187 * 13 11 10 39 39 H 0.97004 * 120.00336 * 359.97438 * 14 13 11 40 40 H 1.08994 * 109.47375 * 60.00061 * 19 18 17 41 41 H 1.08999 * 109.47084 * 180.02562 * 19 18 17 42 42 H 1.09004 * 109.47258 * 299.99731 * 19 18 17 43 43 H 1.08994 * 109.47133 * 59.99903 * 20 18 17 44 44 H 1.09007 * 109.46949 * 180.02562 * 20 18 17 45 45 H 1.08994 * 109.47063 * 299.99720 * 20 18 17 46 46 H 1.08997 * 109.47078 * 59.99941 * 21 18 17 47 47 H 1.08999 * 109.47346 * 179.97438 * 21 18 17 48 48 H 1.09000 * 109.46715 * 299.99996 * 21 18 17 49 49 H 1.08998 * 113.61483 * 334.57566 * 22 8 7 50 50 H 1.09008 * 113.60999 * 105.47570 * 22 8 7 51 51 H 1.07998 * 127.02477 * 180.20779 * 23 3 2 52 52 H 1.08998 * 109.46832 * 304.99444 * 25 24 23 53 53 H 0.96702 * 113.99808 * 60.00290 * 26 25 24 54 54 H 1.48501 * 109.99974 * 58.67871 * 27 25 24 55 55 H 1.48490 * 110.00066 * 179.97438 * 27 25 24 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 2.3050 1.1064 0.0000 4 6 1.8740 2.5157 -0.0005 5 8 0.6891 2.7892 -0.0115 6 7 2.7931 3.5015 0.0055 7 6 2.3647 4.9024 -0.0010 8 6 3.5950 5.8119 0.0073 9 9 4.5293 5.4710 -0.9766 10 6 3.2527 7.3109 0.0387 11 6 4.4242 7.4774 1.0211 12 1 4.2171 8.1739 1.8335 13 6 5.7653 7.7460 0.3355 14 7 6.7889 8.0071 1.3506 15 6 8.0566 8.2715 0.9769 16 8 8.3505 8.2928 -0.2020 17 8 8.9972 8.5119 1.9097 18 6 10.3411 8.7887 1.4347 19 6 10.3206 10.0310 0.5418 20 6 11.2640 9.0344 2.6300 21 6 10.8549 7.5919 0.6318 22 6 4.2116 6.0013 1.4033 23 6 3.6849 0.5990 0.0065 24 6 3.5858 -0.7391 0.0047 25 6 4.7458 -1.7012 0.0102 26 8 5.4692 -1.5682 1.2353 27 14 4.1076 -3.4443 -0.1482 28 8 2.2888 -1.0840 -0.0022 29 1 -0.3633 0.0000 -1.0278 30 1 -0.3634 -0.8900 0.5138 31 1 -0.3633 0.8900 0.5138 32 1 3.7383 3.2833 0.0143 33 1 1.7750 5.0978 -0.8966 34 1 1.7593 5.1014 0.8832 35 1 3.4080 7.8143 -0.9154 36 1 2.2788 7.5272 0.4779 37 1 6.0525 6.8757 -0.2546 38 1 5.6721 8.6133 -0.3180 39 1 6.5542 7.9904 2.2916 40 1 9.9546 10.8836 1.1137 41 1 11.3294 10.2385 0.1848 42 1 9.6632 9.8555 -0.3098 43 1 11.2785 8.1492 3.2658 44 1 12.2728 9.2426 2.2734 45 1 10.8982 9.8868 3.2023 46 1 10.1975 7.4165 -0.2197 47 1 11.8635 7.7999 0.2748 48 1 10.8694 6.7070 1.2680 49 1 3.5010 5.8590 2.2175 50 1 5.1401 5.4490 1.5491 51 1 4.5929 1.1838 0.0115 52 1 5.4063 -1.4786 -0.8278 53 1 4.9423 -1.7520 2.0251 54 1 3.3265 -3.5872 -1.4030 55 1 5.2419 -4.4027 -0.1446 There are 75 doubly filled levels RHF calculation, no. of doubly occupied orbitals= 75 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) F: (AM1): M.J.S. DEWAR AND E. G. ZOEBISCH, THEOCHEM, 180, 1 (1988). 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 m_22_16498492_13308374.mol2 55 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED SCF FIELD WAS ACHIEVED Wall clock time and date at job start Thu Mar 4 2021 15:23:42 Heat of formation + Delta-G solvation = -157.102584 kcal Electronic energy + Delta-G solvation = -38173.940532 eV Core-core repulsion = 32901.858683 eV Total energy + Delta-G solvation = -5272.081849 eV No. of doubly occupied orbitals = 75 and no. of open levels = 1 Molecular weight (most abundant/longest-lived isotopes) = 399.198 amu Computer time = 1.74 seconds Orbital eigenvalues (eV) -48.92080 -43.80036 -41.85008 -40.65120 -39.82739 -38.26536 -38.01901 -36.15667 -35.50812 -34.72145 -34.16616 -33.13529 -30.47470 -29.30295 -28.40108 -28.32729 -27.54151 -27.00828 -25.69950 -24.26390 -23.39368 -22.89686 -22.06196 -21.33769 -20.89187 -20.16579 -19.05743 -19.02273 -18.09369 -17.86092 -17.70985 -17.48784 -17.35419 -17.07800 -16.89020 -16.52552 -16.26309 -16.04351 -15.96358 -15.72023 -15.68884 -15.52204 -15.33755 -14.89746 -14.65631 -14.53147 -14.29890 -14.18935 -14.17393 -14.07882 -13.99563 -13.81428 -13.63072 -13.37476 -13.24842 -13.05479 -12.94646 -12.89517 -12.89293 -12.78835 -12.56535 -12.43054 -12.29880 -12.26272 -12.07450 -11.49035 -11.42495 -11.32628 -11.17731 -11.07586 -10.98004 -10.62712 -10.26987 -10.25188 -9.61980 -5.02286 0.19443 0.78486 1.11590 1.14943 1.38351 1.71538 1.73228 1.89599 2.02163 2.19306 3.01780 3.12205 3.17998 3.21400 3.26393 3.40864 3.45734 3.57597 3.70623 3.71630 3.74402 3.76644 3.91587 3.94194 4.08487 4.28598 4.30163 4.40576 4.43170 4.50358 4.53456 4.57960 4.58217 4.59649 4.64201 4.67766 4.69197 4.73475 4.75197 4.77984 4.81914 4.85130 4.87682 4.93779 4.99177 5.06932 5.10769 5.18252 5.20937 5.23944 5.25373 5.31996 5.32939 5.55708 5.85707 6.34163 6.35460 6.60832 7.04892 7.30275 Net atomic charges, atomic populations, and dipole contributions calculated with CM2 Atom NO. Type Charge No. of electrons 1 C -0.085 4.085 2 C 0.089 3.911 3 C -0.272 4.272 4 C 0.591 3.409 5 O -0.569 6.569 6 N -0.714 5.714 7 C 0.114 3.886 8 C 0.070 3.930 9 F -0.200 7.200 10 C -0.131 4.131 11 C -0.115 4.115 12 H 0.122 0.878 13 C 0.148 3.852 14 N -0.696 5.696 15 C 0.641 3.359 16 O -0.596 6.596 17 O -0.368 6.368 18 C 0.127 3.873 19 C -0.180 4.180 20 C -0.137 4.137 21 C -0.181 4.181 22 C -0.141 4.141 23 C -0.152 4.152 24 C -0.058 4.058 25 C -0.026 4.026 26 O -0.540 6.540 27 Si 0.781 3.219 28 O -0.169 6.169 29 H 0.095 0.905 30 H 0.104 0.896 31 H 0.100 0.900 32 H 0.410 0.590 33 H 0.070 0.930 34 H 0.104 0.896 35 H 0.085 0.915 36 H 0.135 0.865 37 H 0.063 0.937 38 H 0.066 0.934 39 H 0.419 0.581 40 H 0.063 0.937 41 H 0.087 0.913 42 H 0.062 0.938 43 H 0.070 0.930 44 H 0.098 0.902 45 H 0.070 0.930 46 H 0.061 0.939 47 H 0.087 0.913 48 H 0.062 0.938 49 H 0.127 0.873 50 H 0.079 0.921 51 H 0.170 0.830 52 H 0.137 0.863 53 H 0.400 0.600 54 H -0.296 1.296 55 H -0.279 1.279 For the charges calculated by CM2: Dipole moment (debyes) X Y Z Total from point charges -1.119 0.222 6.830 6.924 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 -0.141 4.141 2 C 0.036 3.964 3 C -0.276 4.276 4 C 0.381 3.619 5 O -0.450 6.450 6 N -0.366 5.366 7 C -0.010 4.010 8 C 0.051 3.949 9 F -0.181 7.181 10 C -0.170 4.170 11 C -0.134 4.134 12 H 0.140 0.860 13 C 0.026 3.974 14 N -0.357 5.357 15 C 0.394 3.606 16 O -0.487 6.487 17 O -0.283 6.283 18 C 0.091 3.909 19 C -0.237 4.237 20 C -0.194 4.194 21 C -0.238 4.238 22 C -0.179 4.179 23 C -0.171 4.171 24 C -0.106 4.106 25 C -0.136 4.136 26 O -0.348 6.348 27 Si 0.686 3.314 28 O -0.066 6.066 29 H 0.114 0.886 30 H 0.122 0.878 31 H 0.118 0.882 32 H 0.246 0.754 33 H 0.089 0.911 34 H 0.122 0.878 35 H 0.103 0.897 36 H 0.153 0.847 37 H 0.081 0.919 38 H 0.085 0.915 39 H 0.256 0.744 40 H 0.082 0.918 41 H 0.105 0.895 42 H 0.081 0.919 43 H 0.089 0.911 44 H 0.117 0.883 45 H 0.089 0.911 46 H 0.080 0.920 47 H 0.105 0.895 48 H 0.081 0.919 49 H 0.146 0.854 50 H 0.098 0.902 51 H 0.187 0.813 52 H 0.154 0.846 53 H 0.251 0.749 54 H -0.223 1.223 55 H -0.205 1.205 Dipole moment (debyes) X Y Z Total from point charges -1.289 -0.417 5.363 5.532 hybrid contribution 0.861 0.588 -0.608 1.207 sum -0.428 0.170 4.755 4.778 Atomic orbital electron populations 1.20735 0.82251 1.05934 1.05141 1.23276 0.94869 0.82850 0.95438 1.21196 0.94112 0.93607 1.18707 1.17290 0.85084 0.84297 0.75274 1.90759 1.17573 1.84494 1.52214 1.45589 1.10206 1.05745 1.75027 1.21895 0.95623 0.79061 1.04373 1.22411 0.87275 0.96803 0.88379 1.92845 1.67259 1.93478 1.64507 1.23594 1.00533 0.91480 1.01349 1.22495 0.92456 0.98449 0.99980 0.85980 1.21262 0.85231 1.01426 0.89512 1.44634 1.05066 1.73926 1.12068 1.18368 0.82484 0.76393 0.83314 1.90918 1.81419 1.58013 1.18392 1.86306 1.20355 1.83111 1.38487 1.22354 0.76900 0.95533 0.96118 1.22474 1.04287 0.96572 1.00411 1.21889 0.98336 1.03356 0.95834 1.22477 1.02953 0.97402 1.00942 1.23776 1.02858 0.95956 0.95285 1.22764 0.96437 0.93823 1.04082 1.22884 0.82980 0.95887 1.08853 1.24505 0.90318 1.07416 0.91396 1.86536 1.39632 1.93156 1.15489 0.93263 0.79684 0.72564 0.85927 1.83673 1.16616 1.34929 1.71386 0.88638 0.87762 0.88174 0.75439 0.91130 0.87820 0.89674 0.84682 0.91852 0.91519 0.74428 0.91794 0.89468 0.91948 0.91123 0.88332 0.91059 0.92007 0.89453 0.91902 0.85446 0.90222 0.81261 0.84635 0.74911 1.22282 1.20550 Number of geometries 1 Number of calculations of the screened coulomb radii 1 The total number of SCF iterations 14. 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 0.04 9.88 71.24 0.70 0.74 16 2 C 0.09 0.30 7.37 25.26 0.19 0.49 16 3 C -0.27 -1.22 6.31 -18.99 -0.12 -1.34 16 4 C 0.59 3.52 7.81 86.65 0.68 4.20 16 5 O -0.57 -6.30 14.85 -4.06 -0.06 -6.36 16 6 N -0.71 -0.55 5.47 -466.42 -2.55 -3.10 16 7 C 0.11 -0.25 5.35 86.38 0.46 0.21 16 8 C 0.07 -0.30 1.63 -10.26 -0.02 -0.32 16 9 F -0.20 -0.47 15.08 44.97 0.68 0.20 16 10 C -0.13 1.03 7.13 31.13 0.22 1.25 16 11 C -0.12 0.92 3.94 -10.21 -0.04 0.88 16 12 H 0.12 -1.44 8.14 -2.39 -0.02 -1.46 16 13 C 0.15 -0.14 5.29 86.38 0.46 0.32 16 14 N -0.70 -0.05 5.56 -590.84 -3.29 -3.33 16 15 C 0.64 4.66 8.06 129.79 1.05 5.70 16 16 O -0.60 -8.01 11.88 19.80 0.24 -7.78 16 17 O -0.37 -2.09 9.94 -55.46 -0.55 -2.64 16 18 C 0.13 0.43 1.13 -10.79 -0.01 0.41 16 19 C -0.18 -0.67 8.37 71.98 0.60 -0.07 16 20 C -0.14 0.28 8.85 71.98 0.64 0.92 16 21 C -0.18 -0.73 8.37 71.98 0.60 -0.12 16 22 C -0.14 1.13 7.08 31.18 0.22 1.35 16 23 C -0.15 -0.23 10.48 23.65 0.25 0.02 16 24 C -0.06 -0.05 6.18 24.76 0.15 0.11 16 25 C -0.03 0.06 2.97 71.24 0.21 0.27 16 26 O -0.54 1.45 12.88 -148.98 -1.92 -0.47 16 27 Si 0.78 -1.78 32.09 68.60 2.20 0.43 16 28 O -0.17 -0.36 8.90 4.52 0.04 -0.32 16 29 H 0.10 -0.12 8.14 -2.38 -0.02 -0.14 16 30 H 0.10 -0.53 8.14 -2.39 -0.02 -0.55 16 31 H 0.10 0.22 6.50 -2.39 -0.02 0.20 16 32 H 0.41 -0.63 7.40 -92.70 -0.69 -1.31 16 33 H 0.07 0.03 8.14 -2.39 -0.02 0.01 16 34 H 0.10 -0.46 7.98 -2.39 -0.02 -0.48 16 35 H 0.08 -0.50 8.10 -2.39 -0.02 -0.52 16 36 H 0.14 -1.64 8.10 -2.39 -0.02 -1.66 16 37 H 0.06 0.23 6.32 -2.39 -0.02 0.22 16 38 H 0.07 0.08 8.14 -2.39 -0.02 0.06 16 39 H 0.42 -2.24 8.58 -92.71 -0.80 -3.03 16 40 H 0.06 0.17 8.14 -2.39 -0.02 0.16 16 41 H 0.09 0.02 8.14 -2.39 -0.02 0.00 16 42 H 0.06 0.58 5.88 -2.38 -0.01 0.57 16 43 H 0.07 -0.16 8.14 -2.39 -0.02 -0.18 16 44 H 0.10 -0.51 8.14 -2.38 -0.02 -0.53 16 45 H 0.07 -0.18 8.14 -2.39 -0.02 -0.19 16 46 H 0.06 0.60 5.88 -2.39 -0.01 0.59 16 47 H 0.09 0.04 8.14 -2.39 -0.02 0.02 16 48 H 0.06 0.20 8.14 -2.39 -0.02 0.18 16 49 H 0.13 -1.47 7.99 -2.39 -0.02 -1.49 16 50 H 0.08 -0.47 8.10 -2.38 -0.02 -0.49 16 51 H 0.17 -0.32 7.74 -2.91 -0.02 -0.34 16 52 H 0.14 -0.37 7.96 -2.39 -0.02 -0.39 16 53 H 0.40 -4.17 8.70 -74.06 -0.64 -4.81 16 54 H -0.30 -1.44 7.11 99.48 0.71 -0.73 16 55 H -0.28 -0.87 7.11 99.48 0.71 -0.16 16 Total: 0.00 -24.71 450.02 -0.11 -24.83 By element: Atomic # 1 Polarization: -15.33 SS G_CDS: -1.14 Total: -16.47 kcal Atomic # 6 Polarization: 8.78 SS G_CDS: 6.24 Total: 15.02 kcal Atomic # 7 Polarization: -0.59 SS G_CDS: -5.84 Total: -6.43 kcal Atomic # 8 Polarization: -15.31 SS G_CDS: -2.25 Total: -17.57 kcal Atomic # 9 Polarization: -0.47 SS G_CDS: 0.68 Total: 0.20 kcal Atomic # 14 Polarization: -1.78 SS G_CDS: 2.20 Total: 0.43 kcal Total: -24.71 -0.11 -24.83 kcal The number of atoms in the molecule is 55 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. m_22_16498492_13308374.mol2 55 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 -132.275 kcal (2) G-P(sol) polarization free energy of solvation -24.715 kcal (3) G-ENP(sol) elect.-nuc.-pol. free energy of system -156.989 kcal (4) G-CDS(sol) cavity-dispersion-solvent structure free energy -0.113 kcal (5) G-P-CDS(sol) = G-P(sol) + G-CDS(sol) = (2) + (4) -24.828 kcal (6) G-S(sol) free energy of system = (1) + (5) -157.103 kcal 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED Total computer time = 1.74 seconds