Wall clock time and date at job start Sat Mar 6 2021 11:11:54 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 1.53007 * 1 3 3 C 1.52998 * 109.47203 * 2 1 4 4 C 1.52996 * 109.47500 * 294.22714 * 3 2 1 5 5 C 1.52995 * 109.47129 * 174.22117 * 3 2 1 6 6 C 1.50699 * 109.47150 * 177.81900 * 5 3 2 7 7 O 1.21288 * 120.00201 * 245.99843 * 6 5 3 8 8 N 1.34775 * 119.99940 * 65.99770 * 6 5 3 9 9 C 1.46501 * 120.00146 * 185.06075 * 8 6 5 10 10 H 1.08995 * 112.84967 * 336.19598 * 9 8 6 11 11 C 1.53782 * 113.61538 * 107.50176 * 9 8 6 12 12 C 1.53786 * 87.07863 * 89.11755 * 11 9 8 13 13 H 1.09005 * 113.68743 * 270.87209 * 12 11 9 14 14 C 1.50699 * 113.61032 * 139.98320 * 12 11 9 15 15 C 1.38236 * 119.99072 * 322.22601 * 14 12 11 16 16 C 1.38226 * 120.00827 * 179.73239 * 15 14 12 17 17 C 1.38324 * 119.98814 * 0.54226 * 16 15 14 18 18 Br 1.89101 * 120.00984 * 179.70735 * 17 16 15 19 19 C 1.38325 * 119.98177 * 359.72729 * 17 16 15 20 20 C 1.38226 * 119.99038 * 0.02562 * 19 17 16 21 21 C 1.53781 * 87.08308 * 25.43314 * 12 11 9 22 22 N 1.46504 * 109.46766 * 57.82182 * 5 3 2 23 23 C 1.36344 * 125.63751 * 66.63272 * 22 5 3 24 24 C 1.34849 * 108.21787 * 179.82809 * 23 22 5 25 25 C 1.40888 * 107.41545 * 0.42528 * 24 23 22 26 26 C 1.34848 * 107.42105 * 359.73097 * 25 24 23 27 27 C 1.50699 * 125.89238 * 179.97438 * 26 25 24 28 28 O 1.42892 * 109.47234 * 150.02927 * 27 26 25 29 29 Si 1.86306 * 109.47087 * 30.02837 * 27 26 25 30 30 H 1.08996 * 109.46962 * 299.99342 * 1 2 3 31 31 H 1.09003 * 109.47219 * 59.99752 * 1 2 3 32 32 H 1.08999 * 109.46688 * 180.02562 * 1 2 3 33 33 H 1.09005 * 109.46873 * 240.00575 * 2 1 3 34 34 H 1.09000 * 109.47365 * 120.00760 * 2 1 3 35 35 H 1.09005 * 109.46671 * 54.22657 * 3 2 1 36 36 H 1.09003 * 109.46858 * 68.98401 * 4 3 2 37 37 H 1.08991 * 109.47330 * 188.98638 * 4 3 2 38 38 H 1.09006 * 109.46804 * 308.99273 * 4 3 2 39 39 H 1.08995 * 109.47496 * 297.82440 * 5 3 2 40 40 H 0.96997 * 119.99822 * 5.05850 * 8 6 5 41 41 H 1.08995 * 113.61357 * 203.66207 * 11 9 8 42 42 H 1.08993 * 113.61335 * 334.56827 * 11 9 8 43 43 H 1.07994 * 119.99671 * 359.97438 * 15 14 12 44 44 H 1.08001 * 120.00479 * 180.24872 * 16 15 14 45 45 H 1.07999 * 120.00917 * 179.97438 * 19 17 16 46 46 H 1.07995 * 119.99284 * 179.97438 * 20 19 17 47 47 H 1.08997 * 113.61044 * 220.02193 * 21 12 11 48 48 H 1.08994 * 113.61326 * 89.11609 * 21 12 11 49 49 H 1.08004 * 125.88729 * 359.97438 * 23 22 5 50 50 H 1.08000 * 126.28553 * 180.15980 * 24 23 22 51 51 H 1.08005 * 126.28920 * 179.73725 * 25 24 23 52 52 H 1.08999 * 109.47169 * 270.02966 * 27 26 25 53 53 H 0.96709 * 113.99843 * 300.00044 * 28 27 26 54 54 H 1.48500 * 109.99620 * 58.68008 * 29 27 26 55 55 H 1.48495 * 110.00071 * 180.02562 * 29 27 26 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 1.5301 0.0000 0.0000 3 6 2.0401 1.4425 0.0000 4 6 1.6521 2.1207 -1.3154 5 6 3.5631 1.4449 0.1452 6 6 4.0706 2.8629 0.0915 7 8 4.7661 3.2234 -0.8345 8 7 3.7517 3.7304 1.0724 9 6 4.1509 5.1359 0.9656 10 1 5.0108 5.2832 0.3122 11 6 2.9801 6.0882 0.6702 12 6 2.7916 6.2020 2.1922 13 1 2.1229 5.4483 2.6082 14 6 2.4623 7.5972 2.6570 15 6 3.0627 8.6863 2.0533 16 6 2.7567 9.9664 2.4756 17 6 1.8582 10.1570 3.5098 18 35 1.4454 11.9077 4.0935 19 6 1.2619 9.0667 4.1172 20 6 1.5645 7.7871 3.6909 21 6 4.2813 5.8441 2.3244 22 7 4.1590 0.6712 -0.9469 23 6 4.1340 1.0112 -2.2670 24 6 4.7874 0.0570 -2.9605 25 6 5.2235 -0.9124 -2.0358 26 6 4.8251 -0.5107 -0.8118 27 6 5.0729 -1.2423 0.4822 28 8 5.1654 -0.2997 1.5522 29 14 6.6660 -2.2001 0.3589 30 1 -0.3633 0.5137 0.8900 31 1 -0.3634 0.5139 -0.8900 32 1 -0.3633 -1.0277 0.0005 33 1 1.8934 -0.5138 -0.8901 34 1 1.8934 -0.5139 0.8899 35 1 1.5947 1.9852 0.8338 36 1 0.5717 2.2626 -1.3461 37 1 2.1478 3.0888 -1.3851 38 1 1.9601 1.4936 -2.1521 39 1 3.8378 0.9966 1.1000 40 1 3.2578 3.4241 1.8489 41 1 3.2852 7.0215 0.1971 42 1 2.1444 5.6079 0.1614 43 1 3.7679 8.5371 1.2491 44 1 3.2228 10.8174 2.0013 45 1 0.5606 9.2150 4.9251 46 1 1.0993 6.9358 4.1654 47 1 4.4959 5.1668 3.1510 48 1 4.9420 6.7107 2.3035 49 1 3.6727 1.8939 -2.6849 50 1 4.9436 0.0373 -4.0290 51 1 5.7754 -1.8119 -2.2652 52 1 4.2493 -1.9300 0.6742 53 1 5.8786 0.3451 1.4478 54 1 7.7920 -1.2773 0.0657 55 1 6.9215 -2.9266 1.6286 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). Br: (AM1): M.J.S. DEWAR AND E. G. ZOEBISCH, THEOCHEM, 180, 1 (1988). 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_10390340_12360566.mol2 55 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED SCF FIELD WAS ACHIEVED Wall clock time and date at job start Sat Mar 6 2021 11:11:54 Heat of formation + Delta-G solvation = 48.082476 kcal Electronic energy + Delta-G solvation = -36854.714911 eV Core-core repulsion = 32292.534682 eV Total energy + Delta-G solvation = -4562.180229 eV No. of doubly occupied orbitals = 72 and no. of open levels = 1 Molecular weight (most abundant/longest-lived isotopes) = 447.120 amu Computer time = 1.39 seconds Orbital eigenvalues (eV) -42.85727 -41.55599 -40.39321 -38.94269 -37.96701 -37.62363 -34.78523 -33.38933 -32.94609 -32.06295 -31.20457 -30.55311 -30.23747 -28.20903 -26.74896 -26.12194 -25.84729 -25.06390 -23.91211 -22.59844 -22.13404 -21.53971 -21.43961 -20.41276 -20.13925 -18.75277 -18.30016 -17.86617 -17.25991 -16.93430 -16.75386 -16.45695 -16.32788 -16.15549 -16.09966 -15.47556 -15.33972 -15.32169 -14.99210 -14.68682 -14.51194 -14.49335 -14.39252 -14.27868 -14.09176 -13.98183 -13.73078 -13.53934 -13.48175 -13.16773 -13.05333 -13.00556 -12.90921 -12.53174 -12.43797 -12.23314 -12.09902 -12.03767 -11.91394 -11.90077 -11.77767 -11.55424 -11.44710 -11.30961 -11.26411 -11.11501 -10.74411 -10.19036 -10.03281 -9.53730 -9.48191 -8.83117 -4.88000 0.02813 0.29572 0.63374 1.03568 1.34318 1.46345 1.65903 1.73282 1.94427 2.17422 2.29261 2.53628 3.10827 3.34598 3.40513 3.57284 3.61498 3.65996 3.67606 3.79859 3.81761 3.92365 3.92470 3.95415 4.16512 4.17500 4.29455 4.32992 4.38790 4.40265 4.48154 4.56381 4.58142 4.58980 4.65275 4.68303 4.73573 4.74953 4.76690 4.80264 4.85853 4.92155 4.96802 4.99250 5.01421 5.08723 5.09958 5.16752 5.21090 5.21483 5.32625 5.37065 5.42711 5.44103 5.45246 5.60755 5.81368 6.03239 6.25030 6.27522 6.36378 6.50170 7.03957 Net atomic charges, atomic populations, and dipole contributions calculated with CM2 Atom NO. Type Charge No. of electrons 1 C -0.151 4.151 2 C -0.110 4.110 3 C -0.085 4.085 4 C -0.158 4.158 5 C 0.102 3.898 6 C 0.512 3.488 7 O -0.561 6.561 8 N -0.693 5.693 9 C 0.117 3.883 10 H 0.083 0.917 11 C -0.141 4.141 12 C -0.065 4.065 13 H 0.119 0.881 14 C -0.056 4.056 15 C -0.115 4.115 16 C -0.100 4.100 17 C -0.110 4.110 18 Br -0.064 7.064 19 C -0.099 4.099 20 C -0.112 4.112 21 C -0.126 4.126 22 N -0.413 5.413 23 C 0.014 3.986 24 C -0.227 4.227 25 C -0.196 4.196 26 C -0.028 4.028 27 C -0.048 4.048 28 O -0.540 6.540 29 Si 0.788 3.212 30 H 0.064 0.936 31 H 0.053 0.947 32 H 0.055 0.945 33 H 0.052 0.948 34 H 0.070 0.930 35 H 0.111 0.889 36 H 0.073 0.927 37 H 0.043 0.957 38 H 0.058 0.942 39 H 0.160 0.840 40 H 0.417 0.583 41 H 0.095 0.905 42 H 0.072 0.928 43 H 0.144 0.856 44 H 0.136 0.864 45 H 0.139 0.861 46 H 0.153 0.847 47 H 0.089 0.911 48 H 0.099 0.901 49 H 0.152 0.848 50 H 0.139 0.861 51 H 0.162 0.838 52 H 0.137 0.863 53 H 0.382 0.618 54 H -0.304 1.304 55 H -0.290 1.290 For the charges calculated by CM2: Dipole moment (debyes) X Y Z Total from point charges -3.202 -3.537 2.893 5.580 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 -0.208 4.208 2 C -0.148 4.148 3 C -0.104 4.104 4 C -0.216 4.216 5 C -0.003 4.003 6 C 0.297 3.703 7 O -0.439 6.439 8 N -0.345 5.345 9 C 0.011 3.989 10 H 0.101 0.899 11 C -0.179 4.179 12 C -0.083 4.083 13 H 0.137 0.863 14 C -0.057 4.057 15 C -0.134 4.134 16 C -0.120 4.120 17 C -0.189 4.189 18 Br 0.022 6.978 19 C -0.119 4.119 20 C -0.130 4.130 21 C -0.163 4.163 22 N -0.089 5.089 23 C -0.117 4.117 24 C -0.251 4.251 25 C -0.220 4.220 26 C -0.138 4.138 27 C -0.157 4.157 28 O -0.347 6.347 29 Si 0.693 3.307 30 H 0.083 0.917 31 H 0.072 0.928 32 H 0.074 0.926 33 H 0.071 0.929 34 H 0.088 0.912 35 H 0.129 0.871 36 H 0.091 0.909 37 H 0.062 0.938 38 H 0.077 0.923 39 H 0.177 0.823 40 H 0.254 0.746 41 H 0.114 0.886 42 H 0.090 0.910 43 H 0.162 0.838 44 H 0.154 0.846 45 H 0.157 0.843 46 H 0.170 0.830 47 H 0.108 0.892 48 H 0.117 0.883 49 H 0.170 0.830 50 H 0.156 0.844 51 H 0.180 0.820 52 H 0.154 0.846 53 H 0.231 0.769 54 H -0.231 1.231 55 H -0.217 1.217 Dipole moment (debyes) X Y Z Total from point charges -2.732 -2.872 3.272 5.139 hybrid contribution 0.087 1.276 0.221 1.298 sum -2.645 -1.596 3.493 4.663 Atomic orbital electron populations 1.21778 0.94728 1.02076 1.02207 1.21466 0.96563 0.94474 1.02248 1.21492 0.89980 0.98735 1.00226 1.22140 1.02436 0.99585 0.97392 1.22010 0.95462 0.89176 0.93688 1.20828 0.79486 0.87785 0.82174 1.90784 1.38510 1.79031 1.35534 1.45449 1.57894 1.08201 1.22991 1.21831 0.98009 0.79961 0.99085 0.89881 1.23545 0.98565 1.00005 0.95792 1.21647 0.97588 0.93082 0.95958 0.86312 1.20015 0.95267 0.95441 0.94963 1.21236 1.00403 0.91177 1.00580 1.21293 0.96467 0.98822 0.95376 1.21983 1.03862 0.91196 1.01888 1.96758 1.93905 1.17644 1.89525 1.21340 0.99132 0.91764 0.99647 1.21362 0.97875 0.96926 0.96858 1.23377 0.95776 1.00834 0.96357 1.43509 1.42391 1.17407 1.05589 1.21828 1.05717 1.01124 0.83007 1.21071 1.06767 0.97377 0.99870 1.20869 1.07515 1.02293 0.91338 1.20922 1.04770 0.90773 0.97380 1.24856 1.13789 0.94887 0.82169 1.86419 1.56359 1.46019 1.45926 0.93342 0.71969 0.82281 0.83090 0.91719 0.92815 0.92608 0.92900 0.91162 0.87056 0.90852 0.93801 0.92293 0.82294 0.74550 0.88627 0.90958 0.83793 0.84598 0.84326 0.82974 0.89234 0.88300 0.83013 0.84365 0.82047 0.84590 0.76893 1.23086 1.21687 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 0.69 9.69 71.98 0.70 1.39 16 2 C -0.11 0.41 5.11 30.60 0.16 0.57 16 3 C -0.09 0.41 2.26 -10.80 -0.02 0.38 16 4 C -0.16 0.27 7.33 71.98 0.53 0.80 16 5 C 0.10 -0.21 2.45 44.24 0.11 -0.10 16 6 C 0.51 0.34 5.56 87.66 0.49 0.83 16 7 O -0.56 -5.60 14.47 -3.05 -0.04 -5.65 16 8 N -0.69 4.00 5.23 -440.03 -2.30 1.70 16 9 C 0.12 -0.53 4.36 45.52 0.20 -0.33 16 10 H 0.08 0.09 7.42 -2.39 -0.02 0.07 16 11 C -0.14 0.81 7.25 31.12 0.23 1.04 16 12 C -0.06 0.54 3.86 -11.01 -0.04 0.49 16 13 H 0.12 -1.38 8.09 -2.38 -0.02 -1.40 16 14 C -0.06 0.25 5.29 -19.86 -0.11 0.14 16 15 C -0.12 0.32 8.59 22.27 0.19 0.51 16 16 C -0.10 -0.02 9.79 22.29 0.22 0.20 16 17 C -0.11 -0.20 6.22 22.31 0.14 -0.06 16 18 Br -0.06 -0.20 33.70 -20.37 -0.69 -0.89 16 19 C -0.10 0.06 9.79 22.29 0.22 0.28 16 20 C -0.11 0.43 9.71 22.27 0.22 0.64 16 21 C -0.13 1.00 7.29 31.12 0.23 1.22 16 22 N -0.41 -1.09 1.75 -491.52 -0.86 -1.95 16 23 C 0.01 0.09 7.47 83.21 0.62 0.71 16 24 C -0.23 -1.42 10.86 22.14 0.24 -1.18 16 25 C -0.20 -0.63 9.43 22.14 0.21 -0.42 16 26 C -0.03 -0.05 6.16 41.08 0.25 0.20 16 27 C -0.05 0.11 2.99 71.24 0.21 0.32 16 28 O -0.54 1.20 9.78 -148.98 -1.46 -0.26 16 29 Si 0.79 -1.38 31.14 68.60 2.14 0.75 16 30 H 0.06 -0.41 8.14 -2.39 -0.02 -0.43 16 31 H 0.05 -0.19 6.80 -2.39 -0.02 -0.21 16 32 H 0.05 -0.21 8.14 -2.39 -0.02 -0.23 16 33 H 0.05 0.03 7.71 -2.38 -0.02 0.01 16 34 H 0.07 -0.31 8.14 -2.39 -0.02 -0.33 16 35 H 0.11 -1.04 8.14 -2.38 -0.02 -1.06 16 36 H 0.07 -0.24 7.04 -2.39 -0.02 -0.26 16 37 H 0.04 0.04 6.84 -2.39 -0.02 0.03 16 38 H 0.06 0.09 5.49 -2.38 -0.01 0.08 16 39 H 0.16 -0.70 5.01 -2.39 -0.01 -0.71 16 40 H 0.42 -4.85 8.71 -92.71 -0.81 -5.65 16 41 H 0.10 -0.51 6.32 -2.39 -0.02 -0.53 16 42 H 0.07 -0.32 8.14 -2.39 -0.02 -0.34 16 43 H 0.14 -0.84 6.67 -2.91 -0.02 -0.86 16 44 H 0.14 -0.18 8.06 -2.91 -0.02 -0.20 16 45 H 0.14 -0.35 8.06 -2.91 -0.02 -0.37 16 46 H 0.15 -1.31 8.05 -2.91 -0.02 -1.33 16 47 H 0.09 -0.85 8.14 -2.39 -0.02 -0.87 16 48 H 0.10 -0.71 7.71 -2.39 -0.02 -0.73 16 49 H 0.15 1.08 6.32 -2.91 -0.02 1.07 16 50 H 0.14 0.61 8.06 -2.91 -0.02 0.59 16 51 H 0.16 -0.31 6.89 -2.91 -0.02 -0.33 16 52 H 0.14 -0.71 7.96 -2.39 -0.02 -0.73 16 53 H 0.38 -1.62 8.70 -74.05 -0.64 -2.27 16 54 H -0.30 -1.79 7.11 99.48 0.71 -1.08 16 55 H -0.29 -1.10 7.11 99.48 0.71 -0.40 16 Total: 0.00 -18.40 446.52 1.27 -17.12 By element: Atomic # 1 Polarization: -17.98 SS G_CDS: -0.49 Total: -18.47 kcal Atomic # 6 Polarization: 2.66 SS G_CDS: 4.98 Total: 7.64 kcal Atomic # 7 Polarization: 2.91 SS G_CDS: -3.16 Total: -0.25 kcal Atomic # 8 Polarization: -4.41 SS G_CDS: -1.50 Total: -5.91 kcal Atomic # 14 Polarization: -1.38 SS G_CDS: 2.14 Total: 0.75 kcal Atomic # 35 Polarization: -0.20 SS G_CDS: -0.69 Total: -0.89 kcal Total: -18.40 1.27 -17.12 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_10390340_12360566.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 65.206 kcal (2) G-P(sol) polarization free energy of solvation -18.395 kcal (3) G-ENP(sol) elect.-nuc.-pol. free energy of system 46.811 kcal (4) G-CDS(sol) cavity-dispersion-solvent structure free energy 1.272 kcal (5) G-P-CDS(sol) = G-P(sol) + G-CDS(sol) = (2) + (4) -17.124 kcal (6) G-S(sol) free energy of system = (1) + (5) 48.082 kcal 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED Total computer time = 1.39 seconds