Wall clock time and date at job start Tue Mar 9 2021 12:58:19 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 O 1.42902 * 1 3 3 C 1.35951 * 117.00082 * 2 1 4 4 C 1.38908 * 120.06321 * 180.02562 * 3 2 1 5 5 F 1.35102 * 120.04746 * 0.04316 * 4 3 2 6 6 C 1.38331 * 119.90841 * 180.02562 * 4 3 2 7 7 C 1.38260 * 120.02867 * 0.02562 * 6 4 3 8 8 C 1.50698 * 119.94126 * 180.02562 * 7 6 4 9 9 H 1.09008 * 112.90445 * 11.24545 * 8 7 6 10 10 C 1.53777 * 113.61860 * 142.49837 * 8 7 6 11 11 C 1.53774 * 87.08381 * 139.98091 * 10 8 7 12 12 H 1.08997 * 113.69521 * 220.00978 * 11 10 8 13 13 N 1.46505 * 113.61385 * 89.11575 * 11 10 8 14 14 C 1.34773 * 120.00095 * 107.50726 * 13 11 10 15 15 O 1.21593 * 119.99894 * 359.97438 * 14 13 11 16 16 C 1.47565 * 120.00303 * 179.72713 * 14 13 11 17 17 C 1.40204 * 120.12442 * 180.27510 * 16 14 13 18 18 O 1.35649 * 120.00014 * 359.97438 * 17 16 14 19 19 C 1.38822 * 119.99738 * 179.97438 * 17 16 14 20 20 C 1.37761 * 120.24072 * 359.97438 * 19 17 16 21 21 C 1.39841 * 120.24912 * 359.97438 * 20 19 17 22 22 C 1.47816 * 120.00238 * 180.02562 * 21 20 19 23 23 C 1.35941 * 125.93054 * 0.02562 * 22 21 20 24 24 C 1.40963 * 106.74299 * 179.97438 * 23 22 21 25 25 C 1.34712 * 107.03097 * 359.97438 * 24 23 22 26 26 C 1.50694 * 125.66426 * 179.97438 * 25 24 23 27 27 O 1.42905 * 109.46921 * 65.00864 * 26 25 24 28 28 Si 1.86302 * 109.47034 * 185.00479 * 26 25 24 29 29 O 1.34340 * 108.66799 * 359.76346 * 25 24 23 30 30 C 1.39178 * 120.00238 * 359.72393 * 21 20 19 31 31 C 1.53783 * 113.61467 * 239.99959 * 8 7 6 32 32 C 1.38268 * 120.12568 * 0.26814 * 7 6 4 33 33 C 1.38186 * 120.09227 * 359.45998 * 32 7 6 34 34 H 1.08998 * 109.46803 * 59.99598 * 1 2 3 35 35 H 1.09001 * 109.47235 * 180.02562 * 1 2 3 36 36 H 1.09003 * 109.46971 * 299.99755 * 1 2 3 37 37 H 1.08003 * 119.99049 * 180.02562 * 6 4 3 38 38 H 1.09001 * 113.61290 * 25.43350 * 10 8 7 39 39 H 1.09000 * 113.61684 * 254.53373 * 10 8 7 40 40 H 0.97000 * 119.99792 * 287.50291 * 13 11 10 41 41 H 0.96701 * 114.00167 * 90.00195 * 18 17 16 42 42 H 1.07999 * 119.87540 * 179.97438 * 19 17 16 43 43 H 1.08004 * 119.87568 * 179.97438 * 20 19 17 44 44 H 1.07998 * 126.62725 * 359.93514 * 23 22 21 45 45 H 1.07998 * 126.48618 * 180.02562 * 24 23 22 46 46 H 1.09001 * 109.47518 * 305.00861 * 26 25 24 47 47 H 0.96696 * 113.99716 * 179.97438 * 27 26 25 48 48 H 1.48502 * 109.99959 * 178.68252 * 28 26 25 49 49 H 1.48504 * 110.00129 * 300.00356 * 28 26 25 50 50 H 1.07999 * 120.12636 * 180.29473 * 30 21 20 51 51 H 1.08995 * 113.61832 * 105.46433 * 31 8 7 52 52 H 1.09003 * 113.61236 * 334.56352 * 31 8 7 53 53 H 1.07991 * 119.95403 * 179.70705 * 32 7 6 54 54 H 1.07997 * 120.01368 * 180.27512 * 33 32 7 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 8 1.4290 0.0000 0.0000 3 6 2.0462 1.2113 0.0000 4 6 3.4333 1.2855 -0.0005 5 9 4.1713 0.1539 -0.0019 6 6 4.0580 2.5198 0.0000 7 6 3.3025 3.6777 0.0016 8 6 3.9851 5.0212 0.0016 9 1 5.0550 4.9534 -0.1955 10 6 3.2666 6.0773 -0.8546 11 6 3.5898 7.0866 0.2595 12 1 2.7779 7.7831 0.4687 13 7 4.8826 7.7546 0.0894 14 6 4.9284 9.0497 -0.2806 15 8 3.8968 9.6637 -0.4736 16 6 6.2304 9.7242 -0.4462 17 6 6.2809 11.0730 -0.8254 18 8 5.1316 11.7604 -1.0413 19 6 7.5072 11.7051 -0.9798 20 6 8.6775 11.0119 -0.7613 21 6 8.6389 9.6665 -0.3817 22 6 9.8979 8.9281 -0.1481 23 6 11.1538 9.4351 -0.2661 24 6 12.0451 8.3891 0.0476 25 6 11.2971 7.3073 0.3390 26 6 11.8271 5.9526 0.7324 27 8 12.5046 6.0521 1.9867 28 14 10.4108 4.7520 0.8851 29 8 10.0000 7.6381 0.2251 30 6 7.4150 9.0245 -0.2178 31 6 3.6374 5.8888 1.2228 32 6 1.9217 3.6053 0.0083 33 6 1.2923 2.3751 0.0021 34 1 -0.3633 0.5139 -0.8899 35 1 -0.3634 -1.0277 0.0005 36 1 -0.3633 0.5138 0.8900 37 1 5.1364 2.5790 -0.0008 38 1 2.2000 5.8884 -0.9767 39 1 3.7701 6.2914 -1.7973 40 1 5.7055 7.2646 0.2431 41 1 4.7819 12.1993 -0.2538 42 1 7.5438 12.7441 -1.2724 43 1 9.6283 11.5094 -0.8836 44 1 11.4175 10.4441 -0.5467 45 1 13.1236 8.4447 0.0541 46 1 12.5224 5.5993 -0.0291 47 1 12.8722 5.2154 2.3026 48 1 10.9233 3.4046 1.2416 49 1 9.4555 5.2224 1.9203 50 1 7.3829 7.9868 0.0799 51 1 4.4404 5.9507 1.9573 52 1 2.6723 5.6483 1.6687 53 1 1.3343 4.5115 0.0143 54 1 0.2138 2.3201 0.0028 There are 80 doubly filled levels RHF calculation, no. of doubly occupied orbitals= 80 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_9824364_13259648.mol2 54 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED SCF FIELD WAS ACHIEVED Wall clock time and date at job start Tue Mar 9 2021 12:58:19 Heat of formation + Delta-G solvation = -77.290896 kcal Electronic energy + Delta-G solvation = -42126.600140 eV Core-core repulsion = 36492.434971 eV Total energy + Delta-G solvation = -5634.165169 eV No. of doubly occupied orbitals = 80 and no. of open levels = 1 Molecular weight (most abundant/longest-lived isotopes) = 440.156 amu Computer time = 1.48 seconds Orbital eigenvalues (eV) -49.86896 -43.68314 -41.86214 -41.22285 -40.41643 -39.28251 -38.14910 -37.92163 -37.75108 -34.68001 -34.13445 -32.81991 -32.36890 -31.82778 -31.03244 -30.10320 -28.39854 -26.67633 -26.34795 -26.20524 -25.10063 -23.89280 -23.51098 -23.01056 -22.53976 -21.81253 -21.18229 -20.33646 -19.54499 -19.40029 -18.99128 -18.78918 -18.12431 -17.85445 -17.54876 -17.23395 -17.19044 -17.05399 -16.73348 -16.51287 -16.30936 -16.13165 -16.08894 -15.86822 -15.83535 -15.66194 -15.41112 -15.28159 -15.09042 -14.55664 -14.41436 -14.26206 -14.08345 -14.06019 -13.94515 -13.70235 -13.63609 -13.56649 -13.35595 -13.16238 -13.09520 -13.04928 -12.97117 -12.79336 -12.35709 -12.19981 -12.11667 -11.89846 -11.79926 -11.47565 -11.26683 -11.05147 -10.91447 -10.68621 -10.43772 -10.30166 -10.04616 -9.96136 -9.12221 -8.88833 -4.97021 -0.54816 -0.19972 0.08789 0.16962 0.76441 1.15699 1.39744 1.50437 1.71951 1.87589 1.92834 2.00337 2.18015 2.46502 2.63783 3.11921 3.17313 3.21672 3.43227 3.45708 3.58731 3.58958 3.67212 3.72889 3.77552 3.84333 3.95787 4.02763 4.03803 4.08213 4.16102 4.20215 4.22607 4.32284 4.33001 4.33407 4.42967 4.51688 4.62325 4.65755 4.67965 4.69166 4.78803 4.80349 4.85182 4.88097 4.90426 4.90748 5.03143 5.03785 5.07597 5.14428 5.17504 5.17727 5.22574 5.45207 5.46127 5.52365 5.63030 5.64257 6.01545 6.25497 6.41864 6.50740 6.74371 7.12615 Net atomic charges, atomic populations, and dipole contributions calculated with CM2 Atom NO. Type Charge No. of electrons 1 C 0.018 3.982 2 O -0.340 6.340 3 C 0.074 3.926 4 C 0.035 3.965 5 F -0.151 7.151 6 C -0.112 4.112 7 C -0.078 4.078 8 C -0.064 4.064 9 H 0.112 0.888 10 C -0.140 4.140 11 C 0.115 3.885 12 H 0.092 0.908 13 N -0.701 5.701 14 C 0.561 3.439 15 O -0.556 6.556 16 C -0.179 4.179 17 C 0.165 3.835 18 O -0.494 6.494 19 C -0.146 4.146 20 C -0.044 4.044 21 C -0.041 4.041 22 C 0.022 3.978 23 C -0.189 4.189 24 C -0.181 4.181 25 C -0.018 4.018 26 C -0.044 4.044 27 O -0.555 6.555 28 Si 0.761 3.239 29 O -0.175 6.175 30 C -0.052 4.052 31 C -0.127 4.127 32 C -0.081 4.081 33 C -0.178 4.178 34 H 0.070 0.930 35 H 0.114 0.886 36 H 0.070 0.930 37 H 0.156 0.844 38 H 0.105 0.895 39 H 0.068 0.932 40 H 0.410 0.590 41 H 0.411 0.589 42 H 0.165 0.835 43 H 0.165 0.835 44 H 0.177 0.823 45 H 0.163 0.837 46 H 0.125 0.875 47 H 0.404 0.596 48 H -0.269 1.269 49 H -0.299 1.299 50 H 0.147 0.853 51 H 0.083 0.917 52 H 0.108 0.892 53 H 0.157 0.843 54 H 0.160 0.840 For the charges calculated by CM2: Dipole moment (debyes) X Y Z Total from point charges 1.880 0.983 -0.197 2.131 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 -0.076 4.076 2 O -0.254 6.254 3 C 0.028 3.972 4 C 0.016 3.984 5 F -0.130 7.130 6 C -0.131 4.131 7 C -0.078 4.078 8 C -0.082 4.082 9 H 0.130 0.870 10 C -0.179 4.179 11 C 0.009 3.991 12 H 0.110 0.890 13 N -0.353 5.353 14 C 0.349 3.651 15 O -0.435 6.435 16 C -0.183 4.183 17 C 0.118 3.882 18 O -0.308 6.308 19 C -0.165 4.165 20 C -0.062 4.062 21 C -0.042 4.042 22 C -0.027 4.027 23 C -0.208 4.208 24 C -0.201 4.201 25 C -0.068 4.068 26 C -0.152 4.152 27 O -0.367 6.367 28 Si 0.664 3.336 29 O -0.073 6.073 30 C -0.070 4.070 31 C -0.164 4.164 32 C -0.099 4.099 33 C -0.196 4.196 34 H 0.089 0.911 35 H 0.133 0.867 36 H 0.089 0.911 37 H 0.173 0.827 38 H 0.123 0.877 39 H 0.087 0.913 40 H 0.248 0.752 41 H 0.271 0.729 42 H 0.182 0.818 43 H 0.183 0.817 44 H 0.194 0.806 45 H 0.181 0.819 46 H 0.142 0.858 47 H 0.257 0.743 48 H -0.194 1.194 49 H -0.226 1.226 50 H 0.165 0.835 51 H 0.102 0.898 52 H 0.126 0.874 53 H 0.174 0.826 54 H 0.177 0.823 Dipole moment (debyes) X Y Z Total from point charges 0.442 0.834 -0.371 1.014 hybrid contribution 1.220 -0.592 1.358 1.919 sum 1.662 0.242 0.987 1.948 Atomic orbital electron populations 1.23400 0.75803 1.05723 1.02711 1.86108 1.24022 1.26458 1.88804 1.19323 0.91000 0.86477 1.00372 1.17420 0.86605 0.83266 1.11133 1.91455 1.76816 1.50107 1.94638 1.21124 1.01915 0.89236 1.00826 1.19579 0.93427 0.94070 1.00746 1.21578 1.00326 0.88960 0.97358 0.86967 1.23577 1.02240 0.94369 0.97681 1.21896 0.85921 0.93674 0.97561 0.88965 1.45550 1.09716 1.10707 1.69314 1.18206 0.88489 0.82064 0.76335 1.90808 1.35767 1.65785 1.51136 1.20251 0.93200 0.95874 1.08984 1.18872 0.87012 0.89213 0.93055 1.84704 1.38140 1.68831 1.39089 1.21578 0.90117 1.02369 1.02388 1.21417 0.99996 0.91337 0.93499 1.17695 0.88440 0.93624 1.04393 1.20461 0.94779 0.81781 1.05688 1.22164 0.90590 1.02057 1.05961 1.21796 1.01730 0.92069 1.04463 1.21708 0.80495 0.98027 1.06555 1.24025 1.05562 0.96392 0.89227 1.86520 1.74435 1.38908 1.36819 0.93825 0.76901 0.74564 0.88297 1.83880 1.27951 1.27133 1.68304 1.21399 0.89989 1.00204 0.95449 1.23430 1.04310 0.92666 0.96038 1.21204 0.94115 0.97872 0.96739 1.21420 1.01439 0.90818 1.05927 0.91131 0.86748 0.91106 0.82650 0.87697 0.91340 0.75202 0.72864 0.81790 0.81710 0.80563 0.81916 0.85775 0.74331 1.19408 1.22560 0.83495 0.89827 0.87355 0.82558 0.82296 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 0.02 -0.05 9.81 113.37 1.11 1.06 16 2 O -0.34 -2.26 10.36 -93.00 -0.96 -3.22 16 3 C 0.07 0.40 6.69 22.53 0.15 0.55 16 4 C 0.04 0.25 7.31 22.45 0.16 0.41 16 5 F -0.15 -1.74 17.11 44.97 0.77 -0.97 16 6 C -0.11 -0.14 9.68 22.30 0.22 0.08 16 7 C -0.08 0.17 5.29 -19.85 -0.11 0.06 16 8 C -0.06 0.35 3.85 -11.01 -0.04 0.31 16 9 H 0.11 -0.85 8.09 -2.38 -0.02 -0.87 16 10 C -0.14 0.52 7.25 31.12 0.23 0.75 16 11 C 0.11 -0.24 4.32 45.52 0.20 -0.04 16 12 H 0.09 0.15 7.46 -2.39 -0.02 0.13 16 13 N -0.70 0.64 5.21 -443.17 -2.31 -1.67 16 14 C 0.56 3.04 7.76 86.70 0.67 3.71 16 15 O -0.56 -7.04 14.74 16.98 0.25 -6.79 16 16 C -0.18 -0.51 5.88 -20.04 -0.12 -0.63 16 17 C 0.17 0.44 6.72 22.89 0.15 0.60 16 18 O -0.49 -2.33 11.55 -68.64 -0.79 -3.12 16 19 C -0.15 0.34 9.96 22.30 0.22 0.56 16 20 C -0.04 0.16 9.54 22.54 0.22 0.37 16 21 C -0.04 0.02 5.87 -20.13 -0.12 -0.10 16 22 C 0.02 0.03 7.03 24.27 0.17 0.20 16 23 C -0.19 0.05 10.26 22.40 0.23 0.28 16 24 C -0.18 -0.22 10.78 22.13 0.24 0.02 16 25 C -0.02 -0.04 6.24 24.87 0.16 0.12 16 26 C -0.04 0.11 2.97 71.23 0.21 0.32 16 27 O -0.55 0.11 12.86 -148.98 -1.92 -1.80 16 28 Si 0.76 -2.29 32.11 68.60 2.20 -0.08 16 29 O -0.17 -0.48 8.80 -6.57 -0.06 -0.54 16 30 C -0.05 0.02 9.20 22.79 0.21 0.22 16 31 C -0.13 0.75 7.29 31.12 0.23 0.98 16 32 C -0.08 0.25 8.59 22.26 0.19 0.44 16 33 C -0.18 0.13 9.04 22.36 0.20 0.33 16 34 H 0.07 -0.39 7.67 -2.39 -0.02 -0.41 16 35 H 0.11 -0.63 8.14 -2.39 -0.02 -0.65 16 36 H 0.07 -0.40 7.66 -2.39 -0.02 -0.42 16 37 H 0.16 -0.41 8.05 -2.91 -0.02 -0.43 16 38 H 0.10 -0.57 6.32 -2.39 -0.02 -0.58 16 39 H 0.07 -0.09 8.14 -2.39 -0.02 -0.11 16 40 H 0.41 -2.26 6.73 -92.71 -0.62 -2.88 16 41 H 0.41 -1.01 9.06 -74.06 -0.67 -1.68 16 42 H 0.16 -1.06 8.06 -2.91 -0.02 -1.09 16 43 H 0.17 -1.49 6.96 -2.91 -0.02 -1.51 16 44 H 0.18 -1.03 7.24 -2.91 -0.02 -1.05 16 45 H 0.16 -0.25 8.06 -2.91 -0.02 -0.28 16 46 H 0.12 -1.01 7.96 -2.39 -0.02 -1.03 16 47 H 0.40 -3.65 8.74 -74.06 -0.65 -4.30 16 48 H -0.27 0.10 7.11 99.48 0.71 0.81 16 49 H -0.30 -1.53 7.11 99.48 0.71 -0.83 16 50 H 0.15 -0.58 6.24 -2.91 -0.02 -0.60 16 51 H 0.08 -0.54 8.14 -2.39 -0.02 -0.55 16 52 H 0.11 -0.77 7.71 -2.39 -0.02 -0.79 16 53 H 0.16 -1.22 6.67 -2.92 -0.02 -1.24 16 54 H 0.16 -0.90 6.30 -2.91 -0.02 -0.91 16 Total: 0.00 -29.96 457.70 1.09 -28.87 By element: Atomic # 1 Polarization: -20.39 SS G_CDS: -0.88 Total: -21.27 kcal Atomic # 6 Polarization: 5.82 SS G_CDS: 4.78 Total: 10.60 kcal Atomic # 7 Polarization: 0.64 SS G_CDS: -2.31 Total: -1.67 kcal Atomic # 8 Polarization: -12.00 SS G_CDS: -3.48 Total: -15.48 kcal Atomic # 9 Polarization: -1.74 SS G_CDS: 0.77 Total: -0.97 kcal Atomic # 14 Polarization: -2.29 SS G_CDS: 2.20 Total: -0.08 kcal Total: -29.96 1.09 -28.87 kcal The number of atoms in the molecule is 54 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_9824364_13259648.mol2 54 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 -48.417 kcal (2) G-P(sol) polarization free energy of solvation -29.959 kcal (3) G-ENP(sol) elect.-nuc.-pol. free energy of system -78.376 kcal (4) G-CDS(sol) cavity-dispersion-solvent structure free energy 1.086 kcal (5) G-P-CDS(sol) = G-P(sol) + G-CDS(sol) = (2) + (4) -28.874 kcal (6) G-S(sol) free energy of system = (1) + (5) -77.291 kcal 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED Total computer time = 1.48 seconds