Wall clock time and date at job start Sun Mar 7 2021 12:22:59 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 * DEV - DEVELOPER OPTIONS ARE ALLOWED * SM5.42R - SM5.42R CALCULATIONS WILL BE PERFORMED * - CHARGE MODEL 2 WILL BE USED (CM2A) * - THE SOLVENT IS USER-SPECIFIED * DIELEC - THE SOLVENT DIELECTRIC CONSTANT IS 2.06 * IOFR - THE SOLVENT INDEX OF REFRACTION IS 1.4345 * ALPHA - THE SOLVENT ALPHA IS 0.00 * BETA - THE SOLVENT BETA IS 0.00 * GAMMA - THE SOLVENT MACROSCOPIC SURFACE TENSION IS * 38.93 CAL MOL^-1 ANGSTROM^-2 * FACARB - THE FRACTION OF AROMATIC CARBONS IS 0.00 * FEHALO - THE FRACTION OF ELECTRONEGATIVE HALOGENS IS 0.00 ******************************************************************************* 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 S 1.81400 * 1 3 3 O 1.42100 * 108.58113 * 2 1 4 4 O 1.42102 * 108.57917 * 228.97130 * 2 1 3 5 5 C 1.81401 * 101.91856 * 114.48797 * 2 1 3 6 6 H 1.08995 * 112.85102 * 53.79905 * 5 2 1 7 7 C 1.53784 * 113.61446 * 185.00325 * 5 2 1 8 8 C 1.53779 * 87.08291 * 139.97696 * 7 5 2 9 9 H 1.08996 * 113.61679 * 219.93198 * 8 7 5 10 10 C 1.53001 * 113.61276 * 89.11432 * 8 7 5 11 11 N 1.46498 * 109.46977 * 176.52659 * 10 8 7 12 12 C 1.34775 * 120.00229 * 179.97438 * 11 10 8 13 13 O 1.21282 * 119.99935 * 0.02562 * 12 11 10 14 14 C 1.50697 * 120.00447 * 180.02562 * 12 11 10 15 15 N 1.46505 * 109.47408 * 180.02562 * 14 12 11 16 16 C 1.35031 * 125.93144 * 124.71756 * 15 14 12 17 17 C 1.35086 * 107.98042 * 179.89594 * 16 15 14 18 18 C 1.50696 * 126.07511 * 180.13699 * 17 16 15 19 19 O 1.42898 * 109.47076 * 105.23242 * 18 17 16 20 20 Si 1.86295 * 109.47494 * 345.23213 * 18 17 16 21 21 C 1.40849 * 107.84902 * 0.36707 * 17 16 15 22 22 C 1.48415 * 126.04163 * 179.75511 * 21 17 16 23 23 C 1.39329 * 120.11280 * 316.94471 * 22 21 17 24 24 C 1.38030 * 119.87251 * 179.69842 * 23 22 21 25 25 C 1.38317 * 120.11967 * 0.57567 * 24 23 22 26 26 C 1.38321 * 120.24063 * 359.72182 * 25 24 23 27 27 C 1.38019 * 120.12476 * 359.97438 * 26 25 24 28 28 N 1.31630 * 107.92144 * 359.77059 * 21 17 16 29 29 C 1.53779 * 87.17373 * 334.52238 * 8 7 5 30 30 H 1.09000 * 109.47354 * 305.51820 * 1 2 3 31 31 H 1.09004 * 109.46981 * 65.51286 * 1 2 3 32 32 H 1.08991 * 109.47355 * 185.50980 * 1 2 3 33 33 H 1.09000 * 113.61457 * 25.42921 * 7 5 2 34 34 H 1.09003 * 113.61264 * 254.52630 * 7 5 2 35 35 H 1.08999 * 109.47220 * 296.53060 * 10 8 7 36 36 H 1.08998 * 109.47066 * 56.53022 * 10 8 7 37 37 H 0.97003 * 120.00459 * 0.02562 * 11 10 8 38 38 H 1.08999 * 109.47254 * 300.00224 * 14 12 11 39 39 H 1.08998 * 109.46928 * 60.00122 * 14 12 11 40 40 H 1.07998 * 126.01384 * 359.97438 * 16 15 14 41 41 H 1.08998 * 109.47415 * 225.22886 * 18 17 16 42 42 H 0.96703 * 113.99776 * 299.99998 * 19 18 17 43 43 H 1.48500 * 110.00361 * 179.97438 * 20 18 17 44 44 H 1.48502 * 110.00033 * 301.31770 * 20 18 17 45 45 H 1.07997 * 120.06194 * 359.97438 * 23 22 21 46 46 H 1.07999 * 119.93599 * 180.29355 * 24 23 22 47 47 H 1.07999 * 119.87947 * 179.74122 * 25 24 23 48 48 H 1.08004 * 119.94086 * 179.97438 * 26 25 24 49 49 H 1.07994 * 120.06348 * 180.02562 * 27 26 25 50 50 H 1.09007 * 113.61293 * 140.01858 * 29 8 7 51 51 H 1.08991 * 113.61702 * 270.92706 * 29 8 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 16 1.8140 0.0000 0.0000 3 8 2.2668 1.3469 0.0000 4 8 2.2668 -0.8842 -1.0161 5 6 2.1886 -0.7357 1.6152 6 1 1.6956 -1.6957 1.7677 7 6 3.6893 -0.7535 1.9509 8 6 3.2920 -0.3792 3.3885 9 1 3.9584 0.3494 3.8501 10 6 3.0230 -1.5896 4.2849 11 7 2.7349 -1.1341 5.6471 12 6 2.4653 -2.0321 6.6152 13 8 2.4617 -3.2175 6.3588 14 6 2.1685 -1.5635 8.0164 15 7 1.9110 -2.7225 8.8747 16 6 2.5551 -3.0156 10.0248 17 6 2.0294 -4.1581 10.5178 18 6 2.4467 -4.8506 11.7894 19 8 1.4586 -4.6306 12.7980 20 14 4.0817 -4.1653 12.3620 21 6 1.0254 -4.5899 9.6293 22 6 0.1912 -5.8082 9.7797 23 6 0.7730 -7.0084 10.1825 24 6 -0.0085 -8.1369 10.3268 25 6 -1.3647 -8.0806 10.0609 26 6 -1.9463 -6.8932 9.6547 27 6 -1.1753 -5.7571 9.5132 28 7 0.9579 -3.7223 8.6417 29 6 2.0174 0.2420 2.7934 30 1 -0.3634 0.5970 0.8364 31 1 -0.3633 0.4260 -0.9353 32 1 -0.3633 -1.0228 0.0987 33 1 4.2603 0.0216 1.4398 34 1 4.1439 -1.7407 1.8665 35 1 2.1680 -2.1447 3.8989 36 1 3.9007 -2.2358 4.2959 37 1 2.7374 -0.1860 5.8523 38 1 3.0233 -1.0086 8.4027 39 1 1.2908 -0.9173 8.0050 40 1 3.3499 -2.4375 10.4725 41 1 2.5457 -5.9203 11.6051 42 1 1.3175 -3.6985 13.0137 43 1 4.5041 -4.8397 13.6158 44 1 5.1106 -4.3594 11.3089 45 1 1.8327 -7.0546 10.3857 46 1 0.4405 -9.0666 10.6436 47 1 -1.9719 -8.9670 10.1711 48 1 -3.0057 -6.8548 9.4480 49 1 -1.6305 -4.8304 9.1964 50 1 1.1229 0.0581 3.3888 51 1 2.1320 1.2888 2.5123 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). S: (AM1): M.J.S. DEWAR, Y.-C. YUAN, INORGANIC CHEM., 29, 589 (1990) 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=GENORG IOFR=1.4345 ALPHA=0.00 BETA=0.00 GAMMA=38.93 & DIELEC=2.06 FACARB=0.00 FEHALO=0.00 DEV s_22_17836384_12622748.mol2 51 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 12:22:59 Heat of formation + Delta-G solvation = 13.546208 kcal Electronic energy + Delta-G solvation = -35303.815825 eV Core-core repulsion = 30493.629424 eV Total energy + Delta-G solvation = -4810.186402 eV No. of doubly occupied orbitals = 72 and no. of open levels = 1 Molecular weight (most abundant/longest-lived isotopes) = 406.144 amu Computer time = 3.12 seconds Orbital eigenvalues (eV) -42.47798 -41.19328 -40.11114 -39.61311 -38.02702 -37.64801 -37.07710 -35.65975 -34.79331 -32.32223 -31.91568 -31.36466 -30.77742 -29.97372 -28.28789 -27.18018 -26.09147 -25.34356 -23.93137 -23.31157 -21.97938 -21.56104 -21.03323 -20.59905 -19.86980 -18.79529 -18.58271 -18.40141 -17.60359 -17.44865 -17.28358 -17.07813 -16.83528 -16.70802 -16.28480 -16.17256 -15.94863 -15.61465 -15.52366 -15.38588 -15.16120 -14.83220 -14.47275 -14.32130 -14.30672 -14.25901 -14.20699 -14.07689 -13.95348 -13.89461 -13.67663 -13.47446 -13.33578 -13.18981 -13.06607 -12.91864 -12.41724 -12.33790 -12.12859 -12.02446 -11.97488 -11.91620 -11.78858 -11.66627 -11.34027 -11.14613 -10.58189 -10.33844 -10.21142 -9.72009 -9.69849 -9.22095 -5.10091 -1.10912 0.26114 0.62562 0.77499 1.17992 1.33937 1.36448 1.59511 1.62564 1.81706 1.88265 1.99573 2.40228 2.65785 2.98165 3.02333 3.10729 3.16912 3.27840 3.28759 3.45217 3.56696 3.62517 3.69442 3.71391 3.76632 3.78145 3.92578 4.07596 4.08581 4.14902 4.20010 4.24527 4.26592 4.31307 4.44854 4.46491 4.51366 4.56823 4.57349 4.60325 4.65311 4.65587 4.82538 4.87362 4.89958 5.08925 5.13240 5.23045 5.38835 5.68596 5.72212 5.74041 5.79942 6.15708 6.18083 6.65492 6.71804 6.95802 Net atomic charges, atomic populations, and dipole contributions calculated with CM2 Atom NO. Type Charge No. of electrons 1 C -0.655 4.655 2 S 2.423 3.577 3 O -0.936 6.936 4 O -0.938 6.938 5 C -0.610 4.610 6 H 0.153 0.847 7 C -0.097 4.097 8 C -0.113 4.113 9 H 0.097 0.903 10 C 0.137 3.863 11 N -0.729 5.729 12 C 0.497 3.503 13 O -0.503 6.503 14 C 0.117 3.883 15 N -0.360 5.360 16 C 0.064 3.936 17 C -0.250 4.250 18 C -0.028 4.028 19 O -0.538 6.538 20 Si 0.680 3.320 21 C 0.132 3.868 22 C -0.007 4.007 23 C -0.093 4.093 24 C -0.119 4.119 25 C -0.113 4.113 26 C -0.120 4.120 27 C -0.091 4.091 28 N -0.249 5.249 29 C -0.112 4.112 30 H 0.129 0.871 31 H 0.130 0.870 32 H 0.128 0.872 33 H 0.102 0.898 34 H 0.093 0.907 35 H 0.074 0.926 36 H 0.076 0.924 37 H 0.403 0.597 38 H 0.130 0.870 39 H 0.119 0.881 40 H 0.181 0.819 41 H 0.112 0.888 42 H 0.375 0.625 43 H -0.253 1.253 44 H -0.256 1.256 45 H 0.121 0.879 46 H 0.125 0.875 47 H 0.124 0.876 48 H 0.125 0.875 49 H 0.123 0.877 50 H 0.089 0.911 51 H 0.109 0.891 For the charges calculated by CM2: Dipole moment (debyes) X Y Z Total from point charges -0.536 6.838 3.655 7.772 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 -0.804 4.804 2 S 2.605 3.395 3 O -0.933 6.933 4 O -0.935 6.935 5 C -0.719 4.719 6 H 0.171 0.829 7 C -0.136 4.136 8 C -0.133 4.133 9 H 0.116 0.884 10 C 0.014 3.986 11 N -0.384 5.384 12 C 0.280 3.720 13 O -0.375 6.375 14 C -0.009 4.009 15 N -0.141 5.141 16 C -0.080 4.080 17 C -0.262 4.262 18 C -0.140 4.140 19 O -0.342 6.342 20 Si 0.582 3.418 21 C -0.034 4.034 22 C -0.009 4.009 23 C -0.113 4.113 24 C -0.137 4.137 25 C -0.131 4.131 26 C -0.138 4.138 27 C -0.110 4.110 28 N -0.069 5.069 29 C -0.150 4.150 30 H 0.147 0.853 31 H 0.148 0.852 32 H 0.147 0.853 33 H 0.121 0.879 34 H 0.112 0.888 35 H 0.092 0.908 36 H 0.094 0.906 37 H 0.238 0.762 38 H 0.148 0.852 39 H 0.137 0.863 40 H 0.198 0.802 41 H 0.129 0.871 42 H 0.222 0.778 43 H -0.177 1.177 44 H -0.181 1.181 45 H 0.139 0.861 46 H 0.143 0.857 47 H 0.142 0.858 48 H 0.143 0.857 49 H 0.141 0.859 50 H 0.107 0.893 51 H 0.128 0.872 Dipole moment (debyes) X Y Z Total from point charges 0.327 5.900 1.758 6.165 hybrid contribution -0.519 -0.406 0.859 1.082 sum -0.191 5.494 2.617 6.089 Atomic orbital electron populations 1.30230 1.26588 1.11682 1.11904 1.07812 0.78503 0.75867 0.77279 1.93609 1.79220 1.34145 1.86306 1.93618 1.79084 1.66981 1.53806 1.31830 1.07689 1.12253 1.20090 0.82861 1.22593 0.90722 1.04591 0.95714 1.22443 0.98116 0.97622 0.95138 0.88426 1.21168 1.02059 0.95344 0.80065 1.45851 1.72912 1.10081 1.09522 1.20569 0.77751 0.86904 0.86743 1.90855 1.48480 1.16167 1.82039 1.21501 1.05090 0.85744 0.88524 1.47844 1.28676 1.19943 1.17652 1.22218 0.98982 0.97881 0.88958 1.20466 1.03881 0.99639 1.02187 1.24401 1.01660 1.02380 0.85573 1.86530 1.60621 1.30750 1.56296 0.95406 0.75385 0.90208 0.80821 1.20596 0.95973 0.94685 0.92182 1.17694 0.92194 0.90007 1.01017 1.21082 0.99745 0.91794 0.98644 1.21070 0.94077 0.98212 1.00345 1.21251 0.95096 0.98026 0.98736 1.21101 1.00000 0.92714 1.00027 1.21155 0.92635 0.98786 0.98465 1.77803 1.09947 0.98583 1.20561 1.22889 0.99646 0.98248 0.94203 0.85269 0.85159 0.85303 0.87929 0.88821 0.90818 0.90597 0.76214 0.85242 0.86318 0.80232 0.87086 0.77844 1.17745 1.18081 0.86108 0.85662 0.85825 0.85697 0.85889 0.89279 0.87243 Number of geometries 1 Number of calculations of the screened coulomb radii 1 The total number of SCF iterations 29. 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 -0.65 2.75 10.62 101.05 1.07 3.82 16 2 S 2.42 -3.88 5.30 -107.50 -0.57 -4.45 16 3 O -0.94 -1.58 17.34 -57.83 -1.00 -2.59 16 4 O -0.94 -2.80 18.10 -57.83 -1.05 -3.85 16 5 C -0.61 2.44 3.82 -25.77 -0.10 2.34 16 6 H 0.15 -0.84 7.70 -51.93 -0.40 -1.24 16 7 C -0.10 0.33 7.26 -25.92 -0.19 0.14 16 8 C -0.11 0.53 3.93 -89.81 -0.35 0.18 16 9 H 0.10 -0.56 8.14 -51.93 -0.42 -0.99 16 10 C 0.14 -0.40 5.35 -4.04 -0.02 -0.42 16 11 N -0.73 2.83 5.56 -60.30 -0.33 2.49 16 12 C 0.50 -0.26 7.86 -10.99 -0.09 -0.34 16 13 O -0.50 -2.65 15.70 5.56 0.09 -2.56 16 14 C 0.12 -0.41 6.99 -5.19 -0.04 -0.45 16 15 N -0.36 -0.29 3.40 -62.58 -0.21 -0.51 16 16 C 0.06 -0.04 9.96 -17.26 -0.17 -0.21 16 17 C -0.25 -0.40 5.35 -104.76 -0.56 -0.96 16 18 C -0.03 -0.02 2.52 36.00 0.09 0.07 16 19 O -0.54 -0.56 12.88 -35.23 -0.45 -1.01 16 20 Si 0.68 -0.87 30.73 -169.99 -5.22 -6.10 16 21 C 0.13 0.56 6.66 -82.77 -0.55 0.01 16 22 C -0.01 -0.03 5.74 -104.90 -0.60 -0.63 16 23 C -0.09 -0.32 8.88 -39.25 -0.35 -0.67 16 24 C -0.12 -0.28 10.03 -39.63 -0.40 -0.68 16 25 C -0.11 -0.23 10.04 -39.52 -0.40 -0.62 16 26 C -0.12 -0.28 10.03 -39.63 -0.40 -0.68 16 27 C -0.09 -0.33 9.78 -39.26 -0.38 -0.72 16 28 N -0.25 -1.16 11.67 33.43 0.39 -0.77 16 29 C -0.11 0.56 7.19 -25.77 -0.19 0.38 16 30 H 0.13 -0.77 8.14 -51.92 -0.42 -1.20 16 31 H 0.13 -0.53 8.14 -51.92 -0.42 -0.95 16 32 H 0.13 -0.71 8.14 -51.93 -0.42 -1.13 16 33 H 0.10 -0.35 8.10 -51.93 -0.42 -0.77 16 34 H 0.09 -0.33 8.10 -51.93 -0.42 -0.75 16 35 H 0.07 -0.13 7.37 -51.93 -0.38 -0.52 16 36 H 0.08 -0.12 8.14 -51.93 -0.42 -0.54 16 37 H 0.40 -2.95 8.47 -40.82 -0.35 -3.30 16 38 H 0.13 -1.00 8.07 -51.93 -0.42 -1.42 16 39 H 0.12 -0.68 8.14 -51.93 -0.42 -1.10 16 40 H 0.18 -0.92 6.40 -52.49 -0.34 -1.25 16 41 H 0.11 0.18 5.57 -51.93 -0.29 -0.11 16 42 H 0.37 -1.14 8.70 45.56 0.40 -0.75 16 43 H -0.25 -0.52 7.11 56.52 0.40 -0.12 16 44 H -0.26 -0.33 7.11 56.52 0.40 0.07 16 45 H 0.12 0.29 6.24 -52.49 -0.33 -0.04 16 46 H 0.13 0.04 8.06 -52.49 -0.42 -0.38 16 47 H 0.12 -0.01 8.06 -52.49 -0.42 -0.43 16 48 H 0.13 0.03 8.06 -52.48 -0.42 -0.39 16 49 H 0.12 0.37 8.06 -52.49 -0.42 -0.05 16 50 H 0.09 -0.54 8.10 -51.92 -0.42 -0.96 16 51 H 0.11 -0.56 7.49 -51.93 -0.39 -0.95 16 LS Contribution 438.30 15.07 6.61 6.61 Total: 0.00 -18.93 438.30 -12.56 -31.49 By element: Atomic # 1 Polarization: -12.11 SS G_CDS: -7.18 Total: -19.29 kcal Atomic # 6 Polarization: 4.16 SS G_CDS: -3.62 Total: 0.54 kcal Atomic # 7 Polarization: 1.37 SS G_CDS: -0.16 Total: 1.21 kcal Atomic # 8 Polarization: -7.60 SS G_CDS: -2.42 Total: -10.01 kcal Atomic # 14 Polarization: -0.87 SS G_CDS: -5.22 Total: -6.10 kcal Atomic # 16 Polarization: -3.88 SS G_CDS: -0.57 Total: -4.45 kcal Total LS contribution 6.61 Total: 6.61 kcal Total: -18.93 -12.56 -31.49 kcal The number of atoms in the molecule is 51 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_17836384_12622748.mol2 51 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 45.032 kcal (2) G-P(sol) polarization free energy of solvation -18.926 kcal (3) G-ENP(sol) elect.-nuc.-pol. free energy of system 26.105 kcal (4) G-CDS(sol) cavity-dispersion-solvent structure free energy -12.559 kcal (5) G-P-CDS(sol) = G-P(sol) + G-CDS(sol) = (2) + (4) -31.485 kcal (6) G-S(sol) free energy of system = (1) + (5) 13.546 kcal 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED Total computer time = 3.12 seconds