Wall clock time and date at job start Sat Apr 11 2020 06:09:52 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= -1 * 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 C 1.52997 * 1 3 3 H 1.08996 * 109.46042 * 2 1 4 4 C 1.53043 * 109.46385 * 240.01945 * 2 1 3 5 5 H 1.09004 * 109.49964 * 60.82273 * 4 2 1 6 6 N 1.46499 * 109.50333 * 300.74684 * 4 2 1 7 7 C 1.34781 * 119.99966 * 154.99828 * 6 4 2 8 8 O 1.21274 * 119.99672 * 359.97438 * 7 6 4 9 9 C 1.50696 * 119.99869 * 180.02562 * 7 6 4 10 10 S 1.80999 * 109.46953 * 179.97438 * 9 7 6 11 11 C 1.76204 * 99.99996 * 179.97438 * 10 9 7 12 12 H 1.07997 * 119.99880 * 0.02562 * 11 10 9 13 13 C 1.38801 * 119.99721 * 179.97438 * 11 10 9 14 14 N 1.31624 * 120.00428 * 0.02562 * 13 11 10 15 15 Si 1.86803 * 119.99493 * 180.02562 * 13 11 10 16 16 H 1.48491 * 109.47393 * 60.00304 * 15 13 11 17 17 H 1.48509 * 109.46995 * 180.02562 * 15 13 11 18 18 H 1.48495 * 109.47205 * 299.99825 * 15 13 11 19 19 C 1.53120 * 109.27777 * 180.80574 * 4 2 1 20 20 C 1.53114 * 109.16118 * 57.65586 * 19 4 2 21 21 C 1.53037 * 109.27855 * 302.34674 * 20 19 4 22 22 N 1.46843 * 109.52773 * 59.17811 * 21 20 19 23 23 C 1.46896 * 111.00327 * 174.16185 * 22 21 20 24 24 C 1.53004 * 109.46959 * 308.19412 * 23 22 21 25 25 C 1.54268 * 110.03273 * 295.65634 * 24 23 22 26 26 C 1.54963 * 104.16180 * 217.13889 * 25 24 23 27 27 C 1.54890 * 102.77904 * 37.88876 * 26 25 24 28 28 C 1.53879 * 110.02883 * 178.44251 * 24 23 22 29 29 H 1.09002 * 109.47201 * 179.97438 * 1 2 3 30 30 H 1.08995 * 109.47422 * 299.97605 * 1 2 3 31 31 H 1.09005 * 109.47250 * 59.97893 * 1 2 3 32 32 H 0.97003 * 120.00219 * 335.00290 * 6 4 2 33 33 H 1.09001 * 109.47538 * 60.00183 * 9 7 6 34 34 H 1.09005 * 109.47300 * 300.00108 * 9 7 6 35 35 H 0.96999 * 120.00028 * 359.97438 * 14 13 11 36 36 H 1.09001 * 109.52102 * 177.56147 * 19 4 2 37 37 H 1.08996 * 109.52029 * 297.75033 * 19 4 2 38 38 H 1.09002 * 109.50465 * 182.40323 * 20 19 4 39 39 H 1.09003 * 109.53790 * 62.30241 * 20 19 4 40 40 H 1.09004 * 109.46094 * 299.15838 * 21 20 19 41 41 H 1.09004 * 109.46325 * 179.20029 * 21 20 19 42 42 H 1.08997 * 109.47278 * 68.19162 * 23 22 21 43 43 H 1.09000 * 109.47158 * 188.19278 * 23 22 21 44 44 H 1.08999 * 110.01443 * 57.05132 * 24 23 22 45 45 H 1.09004 * 110.48684 * 335.78984 * 25 24 23 46 46 H 1.09006 * 110.48386 * 98.42535 * 25 24 23 47 47 H 1.08997 * 110.71803 * 279.57465 * 26 25 24 48 48 H 1.08995 * 110.92233 * 156.29802 * 26 25 24 49 49 H 1.08998 * 110.48992 * 203.41111 * 27 26 25 50 50 H 1.08998 * 110.59607 * 80.81476 * 27 26 25 51 51 H 1.09000 * 110.02593 * 238.56812 * 28 24 23 52 52 H 1.08995 * 110.03202 * 359.94988 * 28 24 23 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 1.5300 0.0000 0.0000 3 1 1.8931 1.0277 0.0000 4 6 2.0399 -0.7211 -1.2499 5 1 1.6889 -0.1988 -2.1399 6 7 1.5373 -2.0971 -1.2600 7 6 1.4088 -2.7590 -2.4271 8 8 1.7089 -2.2153 -3.4687 9 6 0.8912 -4.1742 -2.4375 10 16 0.8338 -4.7830 -4.1411 11 6 0.2121 -6.4084 -3.8644 12 1 -0.0069 -6.7390 -2.8599 13 6 0.0028 -7.2633 -4.9377 14 7 0.2693 -6.8602 -6.1620 15 14 -0.6570 -8.9862 -4.6443 16 1 -1.9864 -8.9021 -3.9882 17 1 -0.7895 -9.6933 -5.9435 18 1 0.2811 -9.7330 -3.7683 19 6 3.5710 -0.7362 -1.2355 20 6 4.0548 -1.4188 0.0469 21 6 3.4864 -0.6776 1.2591 22 7 2.0192 -0.6916 1.1995 23 6 1.4372 -0.1103 2.4165 24 6 2.0442 -0.7887 3.6463 25 6 1.6558 -2.2815 3.6720 26 6 1.4322 -2.5892 5.1743 27 6 0.7546 -1.2961 5.6917 28 6 1.4718 -0.1623 4.9300 29 1 -0.3634 -1.0277 -0.0005 30 1 -0.3634 0.5134 0.8901 31 1 -0.3634 0.5142 -0.8898 32 1 1.2968 -2.5318 -0.4269 33 1 -0.1111 -4.1978 -2.0098 34 1 1.5532 -4.8077 -1.8470 35 1 0.6115 -5.9655 -6.3143 36 1 3.9380 -1.2865 -2.1018 37 1 3.9456 0.2868 -1.2672 38 1 5.1439 -1.3947 0.0834 39 1 3.7130 -2.4538 0.0601 40 1 3.8403 0.3534 1.2532 41 1 3.8174 -1.1697 2.1737 42 1 1.6521 0.9578 2.4477 43 1 0.3581 -0.2639 2.4123 44 1 3.1291 -0.6853 3.6320 45 1 0.7376 -2.4466 3.1082 46 1 2.4649 -2.8931 3.2728 47 1 2.3835 -2.7556 5.6795 48 1 0.7733 -3.4481 5.3018 49 1 0.9063 -1.1894 6.7658 50 1 -0.3096 -1.3002 5.4561 51 1 2.2792 0.2442 5.5391 52 1 0.7624 0.6255 4.6769 RHF calculation, no. of doubly occupied orbitals= 63 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=-1 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 ZINC001486163528.mol2 52 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED SCF FIELD WAS ACHIEVED Wall clock time and date at job start Sat Apr 11 2020 06:09:52 Heat of formation + Delta-G solvation = -61.415661 kcal Electronic energy + Delta-G solvation = -28491.333017 eV Core-core repulsion = 24808.460446 eV Total energy + Delta-G solvation = -3682.872571 eV No. of doubly occupied orbitals = 63 Molecular weight (most abundant/longest-lived isotopes) = 340.193 amu Computer time = 0.84 seconds Orbital eigenvalues (eV) -40.53832 -38.98797 -37.80133 -34.58560 -33.32786 -32.49119 -31.79528 -29.81232 -28.99510 -28.61128 -26.99190 -25.41049 -24.78064 -22.86807 -21.74237 -21.04109 -20.62052 -19.73601 -19.09717 -18.30839 -16.89775 -16.40575 -16.17414 -15.65039 -15.38268 -15.11338 -14.99217 -14.57631 -14.24729 -14.09562 -13.81698 -13.79644 -13.57837 -13.32354 -13.18193 -12.90767 -12.35495 -12.31369 -12.18969 -12.14862 -11.93490 -11.87460 -11.56407 -11.46142 -11.33322 -11.28149 -11.12643 -10.95033 -10.92707 -10.89290 -10.84526 -10.49853 -10.23858 -10.15145 -9.53071 -9.37756 -8.98444 -8.81239 -8.53120 -8.17408 -6.62117 -6.58709 -3.95652 3.01572 3.11592 3.37246 3.40199 3.47766 3.59541 3.78335 4.28758 4.30584 4.30805 4.36863 4.46610 4.63227 4.76942 4.84932 4.97552 5.02552 5.07329 5.11688 5.15403 5.18302 5.23002 5.25908 5.30139 5.30607 5.36236 5.44224 5.46277 5.49625 5.56366 5.57384 5.60752 5.61320 5.67990 5.70862 5.81157 5.82939 5.86498 5.89068 5.98253 6.00705 6.04679 6.09715 6.15515 6.16681 6.18824 6.70623 6.82208 6.89364 7.85991 7.95951 8.53689 8.67157 9.30887 10.85300 Molecular weight = 340.19amu Principal moments of inertia in cm(-1) A = 0.013022 B = 0.002619 C = 0.002324 Principal moments of inertia in units of 10**(-40)*gram-cm**2 A = 2149.674951 B =10690.051784 C =12043.514235 Net atomic charges, atomic populations, and dipole contributions calculated with CM2 Atom NO. Type Charge No. of electrons 1 C -0.148 4.148 2 C 0.077 3.923 3 H 0.051 0.949 4 C 0.159 3.841 5 H 0.089 0.911 6 N -0.717 5.717 7 C 0.530 3.470 8 O -0.524 6.524 9 C -0.129 4.129 10 S -0.117 6.117 11 C -0.606 4.606 12 H 0.065 0.935 13 C 0.035 3.965 14 N -0.885 5.885 15 Si 1.084 2.916 16 H -0.285 1.285 17 H -0.278 1.278 18 H -0.285 1.285 19 C -0.134 4.134 20 C -0.115 4.115 21 C 0.052 3.948 22 N -0.530 5.530 23 C 0.062 3.938 24 C -0.095 4.095 25 C -0.106 4.106 26 C -0.129 4.129 27 C -0.124 4.124 28 C -0.120 4.120 29 H 0.068 0.932 30 H 0.056 0.944 31 H 0.062 0.938 32 H 0.405 0.595 33 H 0.090 0.910 34 H 0.090 0.910 35 H 0.278 0.722 36 H 0.073 0.927 37 H 0.064 0.936 38 H 0.064 0.936 39 H 0.073 0.927 40 H 0.030 0.970 41 H 0.081 0.919 42 H 0.029 0.971 43 H 0.081 0.919 44 H 0.073 0.927 45 H 0.071 0.929 46 H 0.065 0.935 47 H 0.062 0.938 48 H 0.064 0.936 49 H 0.061 0.939 50 H 0.064 0.936 51 H 0.061 0.939 52 H 0.062 0.938 For the charges calculated by CM2: Dipole moment (debyes) X Y Z Total from point charges 4.053 16.072 24.765 29.800 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 -0.206 4.206 2 C -0.032 4.032 3 H 0.069 0.931 4 C 0.053 3.947 5 H 0.107 0.893 6 N -0.372 5.372 7 C 0.316 3.684 8 O -0.399 6.399 9 C -0.280 4.280 10 S 0.109 5.891 11 C -0.754 4.754 12 H 0.083 0.917 13 C -0.176 4.176 14 N -0.519 5.519 15 Si 0.910 3.090 16 H -0.212 1.212 17 H -0.203 1.203 18 H -0.212 1.212 19 C -0.173 4.173 20 C -0.153 4.153 21 C -0.076 4.076 22 N -0.256 5.256 23 C -0.066 4.066 24 C -0.114 4.114 25 C -0.143 4.143 26 C -0.167 4.167 27 C -0.162 4.162 28 C -0.158 4.158 29 H 0.087 0.913 30 H 0.075 0.925 31 H 0.081 0.919 32 H 0.240 0.760 33 H 0.108 0.892 34 H 0.108 0.892 35 H 0.090 0.910 36 H 0.092 0.908 37 H 0.083 0.917 38 H 0.083 0.917 39 H 0.092 0.908 40 H 0.048 0.952 41 H 0.099 0.901 42 H 0.048 0.952 43 H 0.099 0.901 44 H 0.091 0.909 45 H 0.090 0.910 46 H 0.083 0.917 47 H 0.081 0.919 48 H 0.083 0.917 49 H 0.079 0.921 50 H 0.083 0.917 51 H 0.080 0.920 52 H 0.081 0.919 Dipole moment (debyes) X Y Z Total from point charges 3.967 15.123 22.205 27.157 hybrid contribution 0.263 1.391 2.620 2.978 sum 4.230 16.514 24.826 30.115 Atomic orbital electron populations 1.21901 0.93721 1.03179 1.01759 1.21887 0.95970 0.95472 0.89891 0.93110 1.20859 0.93206 0.83502 0.97112 0.89287 1.45882 1.67788 1.14248 1.09261 1.20254 0.77166 0.87617 0.83393 1.90683 1.48845 1.68586 1.31804 1.23297 1.03781 0.95103 1.05844 1.84790 1.86302 1.16006 1.01987 1.23706 1.54252 0.99109 0.98358 0.91684 1.26042 0.94913 1.04804 0.91818 1.70793 1.38974 1.21205 1.20955 0.83337 0.76175 0.73506 0.76015 1.21155 1.20320 1.21160 1.21992 0.95716 1.00878 0.98737 1.21549 0.99589 1.00637 0.93534 1.22209 0.87226 0.98789 0.99334 1.61902 1.07223 1.54944 1.01496 1.22310 0.99902 0.95667 0.88677 1.21925 1.00044 0.95966 0.93433 1.22296 1.02003 0.94600 0.95447 1.22552 1.00302 0.97362 0.96475 1.22341 0.99673 0.94864 0.99277 1.22172 0.99712 0.98018 0.95888 0.91289 0.92493 0.91934 0.75964 0.89184 0.89165 0.90998 0.90783 0.91749 0.91698 0.90821 0.95198 0.90105 0.95243 0.90100 0.90915 0.91017 0.91653 0.91889 0.91687 0.92062 0.91695 0.92044 0.91883 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 -0.15 -1.32 8.60 37.16 0.32 -1.00 16 2 C 0.08 0.70 2.15 -67.72 -0.15 0.55 16 3 H 0.05 0.45 8.14 -51.93 -0.42 0.03 16 4 C 0.16 1.88 2.26 -67.85 -0.15 1.73 16 5 H 0.09 1.23 7.58 -51.93 -0.39 0.83 16 6 N -0.72 -9.69 3.70 -53.73 -0.20 -9.89 16 7 C 0.53 9.86 7.82 -10.99 -0.09 9.78 16 8 O -0.52 -11.77 15.52 5.56 0.09 -11.68 16 9 C -0.13 -2.66 6.16 36.00 0.22 -2.43 16 10 S -0.12 -3.19 19.60 -107.50 -2.11 -5.30 16 11 C -0.61 -17.68 9.50 30.94 0.29 -17.38 16 12 H 0.06 1.82 7.80 -52.49 -0.41 1.41 16 13 C 0.03 1.02 5.49 -17.43 -0.10 0.92 16 14 N -0.88 -27.82 13.67 55.49 0.76 -27.06 16 15 Si 1.08 25.19 29.92 -169.99 -5.09 20.10 16 16 H -0.29 -6.27 7.11 56.52 0.40 -5.87 16 17 H -0.28 -6.43 7.11 56.52 0.40 -6.03 16 18 H -0.29 -6.28 7.11 56.52 0.40 -5.87 16 19 C -0.13 -1.51 5.67 -26.61 -0.15 -1.67 16 20 C -0.12 -1.11 5.92 -26.65 -0.16 -1.27 16 21 C 0.05 0.42 5.05 -3.84 -0.02 0.40 16 22 N -0.53 -4.33 3.81 -226.69 -0.86 -5.19 16 23 C 0.06 0.44 3.49 -3.82 -0.01 0.43 16 24 C -0.10 -0.63 2.43 -89.50 -0.22 -0.84 16 25 C -0.11 -0.77 6.11 -25.03 -0.15 -0.93 16 26 C -0.13 -0.87 6.91 -24.70 -0.17 -1.04 16 27 C -0.12 -0.76 6.83 -25.07 -0.17 -0.93 16 28 C -0.12 -0.72 6.46 -25.61 -0.17 -0.88 16 29 H 0.07 0.69 7.40 -51.93 -0.38 0.30 16 30 H 0.06 0.43 6.41 -51.93 -0.33 0.10 16 31 H 0.06 0.58 8.14 -51.93 -0.42 0.16 16 32 H 0.40 4.85 7.92 -40.82 -0.32 4.52 16 33 H 0.09 1.74 8.14 -51.91 -0.42 1.32 16 34 H 0.09 1.75 8.14 -51.91 -0.42 1.33 16 35 H 0.28 8.92 7.12 -40.82 -0.29 8.62 16 36 H 0.07 1.04 8.14 -51.93 -0.42 0.61 16 37 H 0.06 0.64 8.14 -51.93 -0.42 0.22 16 38 H 0.06 0.57 8.14 -51.93 -0.42 0.15 16 39 H 0.07 0.81 7.73 -51.93 -0.40 0.41 16 40 H 0.03 0.24 8.14 -51.93 -0.42 -0.18 16 41 H 0.08 0.61 5.78 -51.93 -0.30 0.31 16 42 H 0.03 0.21 8.14 -51.93 -0.42 -0.21 16 43 H 0.08 0.59 6.40 -51.93 -0.33 0.26 16 44 H 0.07 0.50 6.05 -51.93 -0.31 0.18 16 45 H 0.07 0.59 7.82 -51.93 -0.41 0.18 16 46 H 0.06 0.52 8.14 -51.93 -0.42 0.10 16 47 H 0.06 0.41 8.14 -51.93 -0.42 -0.01 16 48 H 0.06 0.44 8.14 -51.93 -0.42 0.01 16 49 H 0.06 0.34 8.14 -51.93 -0.42 -0.08 16 50 H 0.06 0.40 8.14 -51.93 -0.42 -0.02 16 51 H 0.06 0.35 8.14 -51.93 -0.42 -0.07 16 52 H 0.06 0.37 7.67 -51.93 -0.40 -0.03 16 LS Contribution 406.18 15.07 6.12 6.12 Total: -1.00 -33.21 406.18 -11.58 -44.78 By element: Atomic # 1 Polarization: 12.10 SS G_CDS: -9.42 Total: 2.68 kcal Atomic # 6 Polarization: -13.70 SS G_CDS: -0.86 Total: -14.57 kcal Atomic # 7 Polarization: -41.83 SS G_CDS: -0.30 Total: -42.14 kcal Atomic # 8 Polarization: -11.77 SS G_CDS: 0.09 Total: -11.68 kcal Atomic # 14 Polarization: 25.19 SS G_CDS: -5.09 Total: 20.10 kcal Atomic # 16 Polarization: -3.19 SS G_CDS: -2.11 Total: -5.30 kcal Total LS contribution 6.12 Total: 6.12 kcal Total: -33.21 -11.58 -44.78 kcal The number of atoms in the molecule is 52 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. ZINC001486163528.mol2 52 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 -16.633 kcal (2) G-P(sol) polarization free energy of solvation -33.206 kcal (3) G-ENP(sol) elect.-nuc.-pol. free energy of system -49.839 kcal (4) G-CDS(sol) cavity-dispersion-solvent structure free energy -11.577 kcal (5) G-P-CDS(sol) = G-P(sol) + G-CDS(sol) = (2) + (4) -44.783 kcal (6) G-S(sol) free energy of system = (1) + (5) -61.416 kcal 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED Total computer time = 0.84 seconds