Wall clock time and date at job start Sat Apr 11 2020 06:09:41 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 1.52994 * 1 3 3 N 1.46496 * 109.46852 * 2 1 4 4 C 1.46503 * 120.00290 * 270.00168 * 3 2 1 5 5 C 1.50704 * 109.47179 * 270.00119 * 4 3 2 6 6 H 1.08003 * 119.99865 * 359.97438 * 5 4 3 7 7 C 1.37873 * 120.00139 * 179.97438 * 5 4 3 8 8 N 1.31514 * 120.00173 * 0.02562 * 7 5 4 9 9 Si 1.86799 * 119.99961 * 180.02562 * 7 5 4 10 10 H 1.48496 * 109.47135 * 59.99898 * 9 7 5 11 11 H 1.48502 * 109.47157 * 179.97438 * 9 7 5 12 12 H 1.48499 * 109.47152 * 299.99802 * 9 7 5 13 13 C 1.34780 * 120.00101 * 90.00351 * 3 2 1 14 14 O 1.21283 * 120.00166 * 179.97438 * 13 3 2 15 15 C 1.50704 * 119.99877 * 359.97438 * 13 3 2 16 16 N 1.46899 * 109.47228 * 180.02562 * 15 13 3 17 17 C 1.46845 * 111.00136 * 65.78669 * 16 15 13 18 18 C 1.53032 * 109.52579 * 185.83764 * 17 16 15 19 19 C 1.53118 * 109.31433 * 300.84641 * 18 17 16 20 20 C 1.53125 * 109.15746 * 57.58782 * 19 18 17 21 21 H 1.09001 * 109.49595 * 62.37183 * 20 19 18 22 22 C 1.52999 * 109.50211 * 182.44669 * 20 19 18 23 23 C 1.53006 * 109.63020 * 299.92316 * 22 20 19 24 24 O 1.43361 * 109.63410 * 60.31864 * 22 20 19 25 25 C 1.43895 * 107.45174 * 120.35147 * 24 22 20 26 26 C 1.54916 * 103.01571 * 21.54692 * 25 24 22 27 27 O 1.43754 * 109.62990 * 179.53248 * 22 20 19 28 28 C 1.46844 * 111.00095 * 189.99908 * 16 15 13 29 29 H 1.08998 * 109.47663 * 299.99484 * 1 2 3 30 30 H 1.09003 * 109.47749 * 59.99760 * 1 2 3 31 31 H 1.09004 * 109.47430 * 180.02562 * 1 2 3 32 32 H 1.09003 * 109.47001 * 240.00786 * 2 1 3 33 33 H 1.08996 * 109.47465 * 120.00000 * 2 1 3 34 34 H 1.08997 * 109.47294 * 29.99850 * 4 3 2 35 35 H 1.09001 * 109.47170 * 150.00014 * 4 3 2 36 36 H 0.97001 * 120.00167 * 180.02562 * 8 7 5 37 37 H 1.09001 * 109.47146 * 60.00126 * 15 13 3 38 38 H 1.08998 * 109.46668 * 300.00582 * 15 13 3 39 39 H 1.09003 * 109.46389 * 305.86131 * 17 16 15 40 40 H 1.09007 * 109.46088 * 65.83500 * 17 16 15 41 41 H 1.08998 * 109.49965 * 60.76541 * 18 17 16 42 42 H 1.09001 * 109.50608 * 180.87815 * 18 17 16 43 43 H 1.08998 * 109.49133 * 297.70980 * 19 18 17 44 44 H 1.08993 * 109.55906 * 177.51611 * 19 18 17 45 45 H 1.09001 * 109.47002 * 59.99940 * 23 22 20 46 46 H 1.08993 * 109.46955 * 180.02562 * 23 22 20 47 47 H 1.09000 * 109.47050 * 300.00206 * 23 22 20 48 48 H 1.08991 * 110.77115 * 263.14632 * 25 24 22 49 49 H 1.09000 * 110.82676 * 139.96442 * 25 24 22 50 50 H 1.09000 * 110.97936 * 206.27978 * 26 25 24 51 51 H 1.09001 * 110.97895 * 82.48831 * 26 25 24 52 52 H 1.09002 * 109.45781 * 54.14476 * 28 16 15 53 53 H 1.08996 * 109.46495 * 294.17758 * 28 16 15 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 1.5299 0.0000 0.0000 3 7 2.0182 1.3812 0.0000 4 6 2.2623 2.0719 -1.2687 5 6 3.6856 1.8352 -1.7038 6 1 4.3428 1.2310 -1.0958 7 6 4.1489 2.3898 -2.8780 8 7 3.3489 3.1259 -3.6181 9 14 5.9129 2.0958 -3.4176 10 1 6.1400 0.6390 -3.5949 11 1 6.1601 2.7950 -4.7042 12 1 6.8408 2.6191 -2.3830 13 6 2.2429 2.0166 1.1672 14 8 2.6475 3.1599 1.1672 15 6 1.9913 1.3063 2.4724 16 7 2.3090 2.2064 3.5889 17 6 1.3866 3.3485 3.6231 18 6 1.8344 4.3355 4.7035 19 6 1.8503 3.6275 6.0610 20 6 2.7802 2.4134 5.9838 21 1 3.7964 2.7464 5.7725 22 6 2.7549 1.6649 7.3179 23 6 3.2278 2.5941 8.4377 24 8 1.4211 1.2177 7.5941 25 6 1.4612 -0.2163 7.7058 26 6 2.9498 -0.4998 8.0274 27 8 3.6188 0.5182 7.2447 28 6 2.3049 1.4822 4.8663 29 1 -0.3634 0.5137 0.8900 30 1 -0.3635 0.5139 -0.8899 31 1 -0.3634 -1.0277 0.0005 32 1 1.8933 -0.5137 -0.8901 33 1 1.8933 -0.5138 0.8899 34 1 1.5816 1.6878 -2.0284 35 1 2.0953 3.1411 -1.1383 36 1 3.6747 3.5159 -4.4443 37 1 2.6212 0.4186 2.5302 38 1 0.9432 1.0124 2.5298 39 1 1.3885 3.8460 2.6532 40 1 0.3801 2.9958 3.8483 41 1 2.8354 4.6992 4.4717 42 1 1.1407 5.1755 4.7392 43 1 0.8418 3.2984 6.3114 44 1 2.2109 4.3144 6.8266 45 1 2.5671 3.4591 8.4954 46 1 3.2092 2.0582 9.3866 47 1 4.2445 2.9269 8.2286 48 1 1.1742 -0.6854 6.7648 49 1 0.8197 -0.5599 8.5173 50 1 3.2373 -1.4979 7.6967 51 1 3.1511 -0.3695 9.0907 52 1 2.9739 0.6242 4.7994 53 1 1.2942 1.1382 5.0856 RHF calculation, no. of doubly occupied orbitals= 66 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=-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 ZINC000183911996.mol2 53 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 06:09:41 Heat of formation + Delta-G solvation = -118.633704 kcal Electronic energy + Delta-G solvation = -31848.810519 eV Core-core repulsion = 27720.703917 eV Total energy + Delta-G solvation = -4128.106602 eV No. of doubly occupied orbitals = 66 Molecular weight (most abundant/longest-lived isotopes) = 340.220 amu Computer time = 5.28 seconds Orbital eigenvalues (eV) -41.13300 -39.42919 -37.95683 -35.29553 -35.20768 -34.12671 -32.74684 -31.98189 -30.09544 -29.79941 -28.86168 -28.06303 -26.20301 -24.15124 -23.53515 -23.11700 -22.89915 -22.13313 -20.95889 -19.63760 -18.25501 -17.57960 -16.83819 -16.54645 -16.26695 -16.00788 -15.59963 -15.13266 -15.05037 -14.76656 -14.39809 -14.30005 -14.08136 -13.92051 -13.49814 -13.41519 -13.28516 -13.15591 -13.06322 -12.73916 -12.57725 -12.42316 -12.21895 -12.08352 -11.94360 -11.78470 -11.59856 -11.41865 -11.17537 -11.13512 -10.88572 -10.69879 -10.61677 -10.56086 -10.49743 -10.46901 -10.27012 -10.06882 -9.74617 -9.56530 -8.75322 -8.38033 -8.03029 -7.56554 -5.99056 -4.03331 3.09402 3.35926 3.40075 3.42871 3.53100 3.58478 3.75822 4.22446 4.25741 4.47774 4.50376 4.56142 4.64616 4.82259 4.87969 4.99146 5.06863 5.13407 5.15854 5.26062 5.32033 5.32931 5.35255 5.38443 5.45003 5.49671 5.56449 5.61343 5.64661 5.65902 5.68791 5.76697 5.79433 5.83015 5.85947 5.97854 6.05800 6.06848 6.15919 6.25661 6.39212 6.49314 6.50044 6.86108 7.04821 7.25374 7.31643 7.50928 7.63315 7.98168 8.29896 8.51415 8.97064 9.21550 9.61790 11.08958 Molecular weight = 340.22amu Principal moments of inertia in cm(-1) A = 0.015604 B = 0.002674 C = 0.002623 Principal moments of inertia in units of 10**(-40)*gram-cm**2 A = 1794.021312 B =10466.784633 C =10671.615226 Net atomic charges, atomic populations, and dipole contributions calculated with CM2 Atom NO. Type Charge No. of electrons 1 C -0.168 4.168 2 C 0.107 3.893 3 N -0.600 5.600 4 C 0.249 3.751 5 C -0.524 4.524 6 H 0.056 0.944 7 C 0.061 3.939 8 N -0.897 5.897 9 Si 0.897 3.103 10 H -0.277 1.277 11 H -0.287 1.287 12 H -0.276 1.276 13 C 0.507 3.493 14 O -0.522 6.522 15 C 0.039 3.961 16 N -0.518 5.518 17 C 0.051 3.949 18 C -0.113 4.113 19 C -0.111 4.111 20 C -0.083 4.083 21 H 0.095 0.905 22 C 0.260 3.740 23 C -0.171 4.171 24 O -0.374 6.374 25 C 0.020 3.980 26 C 0.015 3.985 27 O -0.367 6.367 28 C 0.069 3.931 29 H 0.048 0.952 30 H 0.061 0.939 31 H 0.058 0.942 32 H 0.082 0.918 33 H 0.062 0.938 34 H 0.030 0.970 35 H 0.042 0.958 36 H 0.263 0.737 37 H 0.095 0.905 38 H 0.053 0.947 39 H 0.099 0.901 40 H 0.022 0.978 41 H 0.074 0.926 42 H 0.066 0.934 43 H 0.066 0.934 44 H 0.064 0.936 45 H 0.078 0.922 46 H 0.060 0.940 47 H 0.077 0.923 48 H 0.075 0.925 49 H 0.097 0.903 50 H 0.108 0.892 51 H 0.073 0.927 52 H 0.075 0.925 53 H 0.033 0.967 For the charges calculated by CM2: Dipole moment (debyes) X Y Z Total from point charges -6.600 -7.857 24.663 26.713 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 -0.227 4.227 2 C -0.017 4.017 3 N -0.333 5.333 4 C 0.130 3.870 5 C -0.563 4.563 6 H 0.075 0.925 7 C -0.141 4.141 8 N -0.536 5.536 9 Si 0.725 3.275 10 H -0.203 1.203 11 H -0.212 1.212 12 H -0.201 1.201 13 C 0.293 3.707 14 O -0.398 6.398 15 C -0.092 4.092 16 N -0.242 5.242 17 C -0.077 4.077 18 C -0.150 4.150 19 C -0.148 4.148 20 C -0.102 4.102 21 H 0.113 0.887 22 C 0.183 3.817 23 C -0.228 4.228 24 O -0.295 6.295 25 C -0.057 4.057 26 C -0.062 4.062 27 O -0.287 6.287 28 C -0.059 4.059 29 H 0.067 0.933 30 H 0.080 0.920 31 H 0.077 0.923 32 H 0.100 0.900 33 H 0.080 0.920 34 H 0.048 0.952 35 H 0.060 0.940 36 H 0.073 0.927 37 H 0.113 0.887 38 H 0.071 0.929 39 H 0.117 0.883 40 H 0.040 0.960 41 H 0.093 0.907 42 H 0.085 0.915 43 H 0.085 0.915 44 H 0.083 0.917 45 H 0.097 0.903 46 H 0.079 0.921 47 H 0.096 0.904 48 H 0.093 0.907 49 H 0.115 0.885 50 H 0.126 0.874 51 H 0.092 0.908 52 H 0.094 0.906 53 H 0.051 0.949 Dipole moment (debyes) X Y Z Total from point charges -5.891 -6.813 24.284 25.901 hybrid contribution 0.156 -0.858 -0.156 0.886 sum -5.735 -7.671 24.128 25.959 Atomic orbital electron populations 1.22221 0.96972 1.01287 1.02208 1.21383 0.93347 0.84448 1.02544 1.48263 1.64173 1.13189 1.07712 1.19223 0.96140 0.93570 0.78111 1.21418 0.96976 1.31791 1.06118 0.92531 1.24926 0.97784 0.94960 0.96426 1.69924 1.35717 1.33566 1.14368 0.86570 0.84954 0.78193 0.77775 1.20309 1.21246 1.20139 1.20133 0.78765 0.87144 0.84692 1.90632 1.44597 1.17871 1.86749 1.22027 1.00111 0.96142 0.90886 1.61491 1.52602 1.08681 1.01467 1.22269 0.91881 0.92003 1.01502 1.21534 1.02670 0.97426 0.93415 1.21619 0.99524 0.95790 0.97878 1.21471 1.01894 0.95444 0.91394 0.88683 1.23434 0.76240 0.87007 0.94977 1.22389 1.02644 1.00090 0.97684 1.88831 1.28068 1.20047 1.92550 1.24117 0.97121 0.81913 1.02514 1.24362 0.91075 0.93906 0.96853 1.89308 1.44858 1.22875 1.71693 1.21967 0.99488 0.96002 0.88476 0.93292 0.92017 0.92267 0.89979 0.91959 0.95181 0.93986 0.92740 0.88705 0.92885 0.88292 0.95981 0.90747 0.91526 0.91530 0.91704 0.90319 0.92080 0.90435 0.90713 0.88492 0.87434 0.90849 0.90619 0.94909 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 -0.17 -2.29 10.24 37.15 0.38 -1.91 16 2 C 0.11 1.74 5.93 -4.05 -0.02 1.72 16 3 N -0.60 -12.85 2.46 -175.06 -0.43 -13.27 16 4 C 0.25 6.58 5.16 -5.19 -0.03 6.55 16 5 C -0.52 -15.11 9.39 -34.44 -0.32 -15.44 16 6 H 0.06 1.64 7.81 -52.48 -0.41 1.23 16 7 C 0.06 1.77 5.46 -17.82 -0.10 1.67 16 8 N -0.90 -27.01 13.29 55.43 0.74 -26.27 16 9 Si 0.90 22.27 29.54 -169.99 -5.02 17.25 16 10 H -0.28 -6.67 7.11 56.52 0.40 -6.26 16 11 H -0.29 -6.99 7.11 56.52 0.40 -6.59 16 12 H -0.28 -6.91 7.11 56.52 0.40 -6.51 16 13 C 0.51 10.78 7.35 -10.98 -0.08 10.70 16 14 O -0.52 -13.31 13.91 5.56 0.08 -13.23 16 15 C 0.04 0.64 4.00 -4.97 -0.02 0.62 16 16 N -0.52 -8.27 4.40 -236.12 -1.04 -9.31 16 17 C 0.05 0.79 5.11 -3.84 -0.02 0.77 16 18 C -0.11 -1.47 6.09 -26.65 -0.16 -1.63 16 19 C -0.11 -1.24 4.75 -26.61 -0.13 -1.37 16 20 C -0.08 -0.99 2.00 -90.54 -0.18 -1.17 16 21 H 0.09 1.25 8.14 -51.93 -0.42 0.83 16 22 C 0.26 2.70 0.73 -26.73 -0.02 2.68 16 23 C -0.17 -1.48 8.85 37.16 0.33 -1.15 16 24 O -0.37 -3.83 9.46 -59.05 -0.56 -4.39 16 25 C 0.02 0.15 8.07 38.17 0.31 0.45 16 26 C 0.01 0.10 7.92 38.17 0.30 0.41 16 27 O -0.37 -3.94 10.35 -59.05 -0.61 -4.55 16 28 C 0.07 0.90 4.45 -3.84 -0.02 0.88 16 29 H 0.05 0.64 7.22 -51.93 -0.37 0.27 16 30 H 0.06 0.93 8.14 -51.93 -0.42 0.50 16 31 H 0.06 0.64 8.14 -51.93 -0.42 0.22 16 32 H 0.08 1.39 8.07 -51.93 -0.42 0.97 16 33 H 0.06 0.85 6.44 -51.93 -0.33 0.51 16 34 H 0.03 0.80 8.07 -51.93 -0.42 0.38 16 35 H 0.04 1.25 7.42 -51.93 -0.39 0.87 16 36 H 0.26 7.50 8.31 -40.82 -0.34 7.16 16 37 H 0.09 1.39 7.25 -51.93 -0.38 1.02 16 38 H 0.05 0.75 7.17 -51.93 -0.37 0.38 16 39 H 0.10 1.85 5.78 -51.93 -0.30 1.55 16 40 H 0.02 0.32 8.14 -51.93 -0.42 -0.10 16 41 H 0.07 1.07 8.14 -51.93 -0.42 0.65 16 42 H 0.07 0.77 8.14 -51.93 -0.42 0.35 16 43 H 0.07 0.77 7.64 -51.93 -0.40 0.37 16 44 H 0.06 0.63 6.59 -51.93 -0.34 0.28 16 45 H 0.08 0.64 6.51 -51.93 -0.34 0.30 16 46 H 0.06 0.47 8.14 -51.93 -0.42 0.05 16 47 H 0.08 0.65 8.14 -51.93 -0.42 0.23 16 48 H 0.07 0.53 8.14 -51.93 -0.42 0.11 16 49 H 0.10 0.49 8.14 -51.93 -0.42 0.07 16 50 H 0.11 0.56 8.14 -51.93 -0.42 0.14 16 51 H 0.07 0.42 8.14 -51.93 -0.42 0.00 16 52 H 0.08 1.00 7.58 -51.93 -0.39 0.61 16 53 H 0.03 0.42 7.65 -51.93 -0.40 0.02 16 LS Contribution 407.41 15.07 6.14 6.14 Total: -1.00 -34.31 407.41 -9.95 -44.26 By element: Atomic # 1 Polarization: 9.07 SS G_CDS: -9.47 Total: -0.40 kcal Atomic # 6 Polarization: 3.56 SS G_CDS: 0.22 Total: 3.78 kcal Atomic # 7 Polarization: -48.12 SS G_CDS: -0.73 Total: -48.85 kcal Atomic # 8 Polarization: -21.08 SS G_CDS: -1.09 Total: -22.18 kcal Atomic # 14 Polarization: 22.27 SS G_CDS: -5.02 Total: 17.25 kcal Total LS contribution 6.14 Total: 6.14 kcal Total: -34.31 -9.95 -44.26 kcal The number of atoms in the molecule is 53 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. ZINC000183911996.mol2 53 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 -74.373 kcal (2) G-P(sol) polarization free energy of solvation -34.309 kcal (3) G-ENP(sol) elect.-nuc.-pol. free energy of system -108.682 kcal (4) G-CDS(sol) cavity-dispersion-solvent structure free energy -9.952 kcal (5) G-P-CDS(sol) = G-P(sol) + G-CDS(sol) = (2) + (4) -44.261 kcal (6) G-S(sol) free energy of system = (1) + (5) -118.634 kcal 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED Total computer time = 5.28 seconds