Wall clock time and date at job start Sun Mar 7 2021 04:34:52 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 O 2 2 C 1.42898 * 1 3 3 Si 1.86292 * 109.47323 * 2 1 4 4 C 1.50700 * 109.47360 * 120.00368 * 2 1 3 5 5 C 1.38319 * 119.88033 * 64.99443 * 4 2 1 6 6 C 1.38021 * 120.12442 * 180.02562 * 5 4 2 7 7 C 1.39337 * 119.87409 * 359.97438 * 6 5 4 8 8 C 1.48392 * 120.11866 * 179.97438 * 7 6 5 9 9 C 1.39318 * 120.12152 * 236.64808 * 8 7 6 10 10 C 1.50698 * 120.05983 * 0.02748 * 9 8 7 11 11 C 1.50704 * 109.47222 * 84.27464 * 10 9 8 12 12 O 1.21275 * 119.99728 * 5.62182 * 11 10 9 13 13 N 1.34780 * 119.99649 * 185.61964 * 11 10 9 14 14 C 1.46505 * 119.99530 * 179.97438 * 13 11 10 15 15 H 1.08998 * 112.84991 * 336.19995 * 14 13 11 16 16 C 1.53779 * 113.61330 * 107.50483 * 14 13 11 17 17 C 1.53779 * 87.08227 * 89.11308 * 16 14 13 18 18 H 1.09001 * 113.61646 * 270.88714 * 17 16 14 19 19 C 1.52999 * 113.69110 * 139.98755 * 17 16 14 20 20 N 1.46504 * 109.46785 * 87.46725 * 19 17 16 21 21 C 1.34951 * 126.03313 * 124.99957 * 20 19 17 22 22 C 1.35321 * 107.74298 * 179.97438 * 21 20 19 23 23 C 1.39867 * 107.92173 * 0.02562 * 22 21 20 24 24 N 1.30840 * 108.19982 * 359.74280 * 23 22 21 25 25 C 1.53772 * 113.61227 * 205.00314 * 14 13 11 26 26 C 1.38044 * 119.88036 * 180.02562 * 9 8 7 27 27 C 1.38304 * 120.11751 * 359.97438 * 26 9 8 28 28 C 1.38342 * 120.24272 * 359.97438 * 27 26 9 29 29 C 1.37996 * 120.12495 * 359.76585 * 28 27 26 30 30 C 1.39337 * 119.76013 * 0.02562 * 7 6 5 31 31 C 1.38016 * 119.87437 * 359.97438 * 30 7 6 32 32 H 0.96702 * 114.00022 * 299.99566 * 1 2 3 33 33 H 1.09005 * 109.47095 * 239.99706 * 2 1 3 34 34 H 1.48500 * 110.00321 * 300.00138 * 3 2 1 35 35 H 1.48499 * 109.99836 * 61.31911 * 3 2 1 36 36 H 1.08002 * 119.93855 * 0.28360 * 5 4 2 37 37 H 1.08005 * 120.06353 * 180.02562 * 6 5 4 38 38 H 1.09000 * 109.47080 * 204.27833 * 10 9 8 39 39 H 1.09004 * 109.47246 * 324.27853 * 10 9 8 40 40 H 0.96995 * 120.00255 * 0.02562 * 13 11 10 41 41 H 1.08997 * 113.61642 * 203.66478 * 16 14 13 42 42 H 1.09000 * 113.61251 * 334.56803 * 16 14 13 43 43 H 1.09000 * 109.47260 * 207.46357 * 19 17 16 44 44 H 1.09003 * 109.47318 * 327.47398 * 19 17 16 45 45 H 1.07998 * 126.13078 * 359.95708 * 21 20 19 46 46 H 1.07998 * 126.03670 * 179.97438 * 22 21 20 47 47 H 1.07998 * 125.90001 * 179.97438 * 23 22 21 48 48 H 1.08999 * 113.62019 * 25.42958 * 25 14 13 49 49 H 1.08997 * 113.61419 * 156.25581 * 25 14 13 50 50 H 1.07995 * 119.93944 * 180.02562 * 26 9 8 51 51 H 1.07995 * 119.87677 * 180.02562 * 27 26 9 52 52 H 1.08008 * 119.93639 * 180.02562 * 28 27 26 53 53 H 1.08004 * 120.06324 * 180.25697 * 29 28 27 54 54 H 1.08002 * 120.06243 * 179.97438 * 30 7 6 55 55 H 1.08003 * 119.93538 * 179.97438 * 31 30 7 Note: An asterisk (*) indicates this parameter was or will be optimized. Cartesian coordinates (angstroms) NO. Atom X Y Z 1 8 0.0000 0.0000 0.0000 2 6 1.4290 0.0000 0.0000 3 14 2.0500 1.7564 0.0000 4 6 1.9314 -0.7105 1.2304 5 6 1.6831 -2.0611 1.3959 6 6 2.1405 -2.7167 2.5210 7 6 2.8539 -2.0155 3.4910 8 6 3.3476 -2.7148 4.7031 9 6 2.9844 -2.2606 5.9691 10 6 2.0880 -1.0575 6.1109 11 6 0.6483 -1.4871 5.9938 12 8 0.3715 -2.6652 5.9154 13 7 -0.3317 -0.5619 5.9764 14 6 -1.7313 -0.9795 5.8620 15 1 -1.8441 -1.9590 5.3974 16 6 -2.5307 -0.8182 7.1657 17 6 -2.8619 0.6075 6.6940 18 1 -2.1297 1.3520 7.0065 19 6 -4.3026 1.0322 6.9852 20 7 -4.3790 1.6105 8.3291 21 6 -4.8638 2.8304 8.6421 22 6 -4.7587 2.9846 9.9823 23 6 -4.1898 1.8192 10.5063 24 7 -3.9665 0.9928 9.5168 25 6 -2.6481 0.0977 5.2589 26 6 3.4469 -2.9146 7.0933 27 6 4.2691 -4.0193 6.9645 28 6 4.6321 -4.4752 5.7098 29 6 4.1711 -3.8323 4.5791 30 6 3.1011 -0.6550 3.3192 31 6 2.6390 -0.0096 2.1901 32 1 -0.3933 0.4416 0.7651 33 1 1.7923 -0.5139 -0.8900 34 1 1.5615 2.4679 -1.2084 35 1 1.5879 2.4584 1.2242 36 1 1.1340 -2.6046 0.6412 37 1 1.9464 -3.7715 2.6490 38 1 2.2514 -0.5955 7.0845 39 1 2.3177 -0.3385 5.3244 40 1 -0.1102 0.3804 6.0387 41 1 -3.4014 -1.4710 7.2277 42 1 -1.9129 -0.8486 8.0633 43 1 -4.6179 1.7745 6.2519 44 1 -4.9569 0.1624 6.9263 45 1 -5.2636 3.5542 7.9473 46 1 -5.0601 3.8542 10.5474 47 1 -3.9755 1.6322 11.5482 48 1 -2.1253 0.8068 4.6171 49 1 -3.5502 -0.3048 4.7982 50 1 3.1656 -2.5636 8.0751 51 1 4.6285 -4.5282 7.8466 52 1 5.2741 -5.3386 5.6149 53 1 4.4517 -4.1916 3.6000 54 1 3.6532 -0.1067 4.0681 55 1 2.8297 1.0450 2.0562 There are 74 doubly filled levels RHF calculation, no. of doubly occupied orbitals= 74 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_14688104_13158394.mol2 55 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 04:34:52 Heat of formation + Delta-G solvation = 100.618179 kcal Electronic energy + Delta-G solvation = -37814.532565 eV Core-core repulsion = 33171.655604 eV Total energy + Delta-G solvation = -4642.876961 eV No. of doubly occupied orbitals = 74 and no. of open levels = 1 Molecular weight (most abundant/longest-lived isotopes) = 404.189 amu Computer time = 1.40 seconds Orbital eigenvalues (eV) -42.08264 -41.61166 -40.87505 -39.88462 -39.14489 -37.68632 -35.05349 -34.34317 -33.64307 -33.20220 -31.97106 -30.96984 -30.74987 -29.20284 -28.14038 -26.74339 -26.57941 -24.44619 -23.95843 -23.50343 -22.87614 -21.93310 -21.88677 -21.62361 -21.31323 -20.32036 -18.71702 -18.34940 -17.98824 -17.95587 -17.16592 -16.91481 -16.75390 -16.52576 -16.42546 -16.15181 -15.90480 -15.76451 -15.53859 -15.44326 -15.22581 -14.89055 -14.81683 -14.71300 -14.58303 -14.42968 -14.11242 -13.99236 -13.73862 -13.67584 -13.60691 -13.43346 -13.35528 -13.22156 -13.02661 -12.78485 -12.40256 -12.36412 -12.22140 -12.03396 -11.79941 -11.68392 -11.59274 -11.57967 -11.26278 -11.04048 -10.60164 -10.34506 -10.19379 -10.09620 -9.95640 -9.76870 -9.49101 -9.24246 -4.89748 -0.11140 0.36636 0.38337 0.58987 1.01002 1.31698 1.58089 1.59668 1.66892 1.95486 1.96798 2.10332 2.60224 2.85254 3.31846 3.40308 3.44613 3.51703 3.63645 3.65858 3.74087 3.75207 3.87502 3.92946 3.97104 3.99729 4.00837 4.08021 4.16193 4.20411 4.28283 4.33980 4.37442 4.44246 4.47668 4.49085 4.56517 4.57473 4.65609 4.68544 4.70356 4.77006 4.80776 4.85018 4.91307 4.96579 4.99361 5.00372 5.01853 5.07341 5.14760 5.16002 5.32060 5.38814 5.47499 5.52064 5.55525 5.56537 5.63681 5.75495 5.91963 6.02935 6.18746 6.48116 6.48885 6.79489 7.21715 Net atomic charges, atomic populations, and dipole contributions calculated with CM2 Atom NO. Type Charge No. of electrons 1 O -0.548 6.548 2 C -0.087 4.087 3 Si 0.768 3.232 4 C -0.116 4.116 5 C -0.098 4.098 6 C -0.114 4.114 7 C -0.042 4.042 8 C -0.051 4.051 9 C -0.064 4.064 10 C -0.109 4.109 11 C 0.518 3.482 12 O -0.574 6.574 13 N -0.703 5.703 14 C 0.114 3.886 15 H 0.077 0.923 16 C -0.135 4.135 17 C -0.106 4.106 18 H 0.091 0.909 19 C 0.134 3.866 20 N -0.376 5.376 21 C 0.052 3.948 22 C -0.292 4.292 23 C 0.025 3.975 24 N -0.331 5.331 25 C -0.117 4.117 26 C -0.119 4.119 27 C -0.125 4.125 28 C -0.125 4.125 29 C -0.118 4.118 30 C -0.109 4.109 31 C -0.111 4.111 32 H 0.385 0.615 33 H 0.119 0.881 34 H -0.306 1.306 35 H -0.270 1.270 36 H 0.123 0.877 37 H 0.113 0.887 38 H 0.127 0.873 39 H 0.127 0.873 40 H 0.413 0.587 41 H 0.084 0.916 42 H 0.049 0.951 43 H 0.130 0.870 44 H 0.085 0.915 45 H 0.206 0.794 46 H 0.160 0.840 47 H 0.193 0.807 48 H 0.094 0.906 49 H 0.112 0.888 50 H 0.134 0.866 51 H 0.139 0.861 52 H 0.140 0.860 53 H 0.130 0.870 54 H 0.150 0.850 55 H 0.151 0.849 For the charges calculated by CM2: Dipole moment (debyes) X Y Z Total from point charges 1.942 7.583 -1.060 7.899 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 O -0.356 6.356 2 C -0.195 4.195 3 Si 0.673 3.327 4 C -0.116 4.116 5 C -0.116 4.116 6 C -0.132 4.132 7 C -0.042 4.042 8 C -0.051 4.051 9 C -0.064 4.064 10 C -0.148 4.148 11 C 0.306 3.694 12 O -0.452 6.452 13 N -0.355 5.355 14 C 0.008 3.992 15 H 0.096 0.904 16 C -0.174 4.174 17 C -0.125 4.125 18 H 0.110 0.890 19 C 0.014 3.986 20 N -0.158 5.158 21 C -0.094 4.094 22 C -0.322 4.322 23 C -0.160 4.160 24 N -0.153 5.153 25 C -0.156 4.156 26 C -0.137 4.137 27 C -0.143 4.143 28 C -0.143 4.143 29 C -0.136 4.136 30 C -0.127 4.127 31 C -0.129 4.129 32 H 0.234 0.766 33 H 0.137 0.863 34 H -0.235 1.235 35 H -0.195 1.195 36 H 0.141 0.859 37 H 0.131 0.869 38 H 0.145 0.855 39 H 0.145 0.855 40 H 0.250 0.750 41 H 0.103 0.897 42 H 0.068 0.932 43 H 0.148 0.852 44 H 0.104 0.896 45 H 0.223 0.777 46 H 0.177 0.823 47 H 0.210 0.790 48 H 0.112 0.888 49 H 0.130 0.870 50 H 0.152 0.848 51 H 0.157 0.843 52 H 0.158 0.842 53 H 0.148 0.852 54 H 0.168 0.832 55 H 0.168 0.832 Dipole moment (debyes) X Y Z Total from point charges 2.067 6.041 -2.147 6.736 hybrid contribution -1.485 0.314 1.080 1.862 sum 0.583 6.355 -1.067 6.470 Atomic orbital electron populations 1.86587 1.18534 1.80469 1.50038 1.25312 0.83464 1.12287 0.98443 0.93953 0.90396 0.71589 0.76763 1.20364 0.99749 0.94374 0.97104 1.21005 0.98860 0.94485 0.97258 1.21268 0.98093 0.99934 0.93954 1.18860 0.97991 0.94068 0.93291 1.18743 0.98287 0.96148 0.91896 1.19420 0.97415 0.97156 0.92413 1.20943 0.88954 0.97588 1.07341 1.20902 0.88182 0.85612 0.74711 1.90723 1.84762 1.19390 1.50364 1.45556 1.05155 1.10231 1.74528 1.21803 0.80764 0.99228 0.97436 0.90428 1.23343 0.99947 0.97043 0.97095 1.22732 0.95943 0.96630 0.97154 0.89047 1.22049 0.97672 1.00833 0.78019 1.48981 1.47520 1.12459 1.06871 1.23189 0.99070 0.89152 0.98002 1.21854 1.13679 1.02113 0.94518 1.24313 0.99012 0.92971 0.99689 1.77341 1.23770 1.22890 0.91297 1.23268 1.00061 0.97112 0.95125 1.21205 0.97789 0.96204 0.98468 1.21472 0.97911 0.96562 0.98353 1.21374 1.00246 1.00358 0.92339 1.21375 0.97727 0.94958 0.99545 1.21357 1.00038 0.92869 0.98422 1.21173 0.97779 1.00516 0.93387 0.76571 0.86294 1.23457 1.19547 0.85924 0.86915 0.85481 0.85506 0.74978 0.89731 0.93217 0.85227 0.89641 0.77737 0.82271 0.79043 0.88794 0.86963 0.84849 0.84289 0.84182 0.85220 0.83241 0.83158 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 O -0.55 -0.89 12.83 -148.98 -1.91 -2.81 16 2 C -0.09 0.13 2.80 71.24 0.20 0.33 16 3 Si 0.77 -3.15 29.87 68.60 2.05 -1.10 16 4 C -0.12 0.05 5.36 -19.83 -0.11 -0.06 16 5 C -0.10 -0.31 9.67 22.24 0.21 -0.09 16 6 C -0.11 -0.58 9.62 22.48 0.22 -0.37 16 7 C -0.04 -0.14 4.90 -20.04 -0.10 -0.24 16 8 C -0.05 -0.26 5.40 -20.04 -0.11 -0.37 16 9 C -0.06 -0.26 4.38 -19.65 -0.09 -0.35 16 10 C -0.11 0.10 5.33 29.10 0.16 0.25 16 11 C 0.52 2.48 7.81 87.66 0.68 3.16 16 12 O -0.57 -8.54 15.65 -3.01 -0.05 -8.59 16 13 N -0.70 0.68 5.26 -440.04 -2.32 -1.64 16 14 C 0.11 0.02 4.32 45.51 0.20 0.22 16 15 H 0.08 0.47 7.46 -2.39 -0.02 0.45 16 16 C -0.14 -0.18 7.43 31.12 0.23 0.05 16 17 C -0.11 0.47 3.70 -10.27 -0.04 0.43 16 18 H 0.09 -0.31 8.14 -2.39 -0.02 -0.33 16 19 C 0.13 -0.65 6.35 86.38 0.55 -0.10 16 20 N -0.38 -0.56 3.68 -348.04 -1.28 -1.84 16 21 C 0.05 -0.06 11.45 83.54 0.96 0.89 16 22 C -0.29 -0.38 10.80 21.99 0.24 -0.14 16 23 C 0.03 0.12 12.03 85.23 1.02 1.14 16 24 N -0.33 -2.46 12.42 -57.02 -0.71 -3.17 16 25 C -0.12 0.82 7.39 31.12 0.23 1.05 16 26 C -0.12 -0.48 9.67 22.24 0.22 -0.27 16 27 C -0.13 -0.43 10.04 22.31 0.22 -0.21 16 28 C -0.13 -0.45 10.03 22.24 0.22 -0.22 16 29 C -0.12 -0.57 9.62 22.48 0.22 -0.36 16 30 C -0.11 0.18 7.75 22.48 0.17 0.35 16 31 C -0.11 0.35 8.65 22.24 0.19 0.54 16 32 H 0.39 -1.74 8.70 -74.06 -0.64 -2.38 16 33 H 0.12 -0.24 7.96 -2.38 -0.02 -0.26 16 34 H -0.31 -1.30 7.11 99.48 0.71 -0.59 16 35 H -0.27 0.68 7.00 99.48 0.70 1.37 16 36 H 0.12 0.37 8.06 -2.91 -0.02 0.35 16 37 H 0.11 0.74 8.06 -2.91 -0.02 0.72 16 38 H 0.13 -0.72 8.05 -2.39 -0.02 -0.74 16 39 H 0.13 -0.66 4.71 -2.39 -0.01 -0.67 16 40 H 0.41 -2.88 8.70 -92.71 -0.81 -3.69 16 41 H 0.08 0.20 7.90 -2.39 -0.02 0.19 16 42 H 0.05 0.33 8.14 -2.39 -0.02 0.31 16 43 H 0.13 -1.47 8.07 -2.39 -0.02 -1.49 16 44 H 0.09 -0.37 7.85 -2.39 -0.02 -0.39 16 45 H 0.21 -1.89 8.06 -2.91 -0.02 -1.91 16 46 H 0.16 -0.39 8.06 -2.91 -0.02 -0.41 16 47 H 0.19 0.01 8.06 -2.91 -0.02 -0.02 16 48 H 0.09 -0.90 8.14 -2.39 -0.02 -0.92 16 49 H 0.11 -1.01 8.10 -2.39 -0.02 -1.03 16 50 H 0.13 0.10 8.06 -2.91 -0.02 0.08 16 51 H 0.14 -0.08 8.06 -2.91 -0.02 -0.10 16 52 H 0.14 -0.08 8.06 -2.91 -0.02 -0.11 16 53 H 0.13 0.33 8.06 -2.91 -0.02 0.31 16 54 H 0.15 -0.91 7.17 -2.91 -0.02 -0.93 16 55 H 0.15 -1.20 4.82 -2.91 -0.01 -1.21 16 Total: 0.00 -27.90 454.77 1.00 -26.91 By element: Atomic # 1 Polarization: -12.91 SS G_CDS: -0.49 Total: -13.40 kcal Atomic # 6 Polarization: -0.06 SS G_CDS: 5.70 Total: 5.64 kcal Atomic # 7 Polarization: -2.34 SS G_CDS: -4.30 Total: -6.64 kcal Atomic # 8 Polarization: -9.44 SS G_CDS: -1.96 Total: -11.40 kcal Atomic # 14 Polarization: -3.15 SS G_CDS: 2.05 Total: -1.10 kcal Total: -27.90 1.00 -26.91 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. s_22_14688104_13158394.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 127.525 kcal (2) G-P(sol) polarization free energy of solvation -27.902 kcal (3) G-ENP(sol) elect.-nuc.-pol. free energy of system 99.623 kcal (4) G-CDS(sol) cavity-dispersion-solvent structure free energy 0.995 kcal (5) G-P-CDS(sol) = G-P(sol) + G-CDS(sol) = (2) + (4) -26.907 kcal (6) G-S(sol) free energy of system = (1) + (5) 100.618 kcal 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED Total computer time = 1.40 seconds