Wall clock time and date at job start Tue Mar 31 2020 19:57:06 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 1.53002 * 1 3 3 C 1.50699 * 109.47249 * 2 1 4 4 C 1.32988 * 119.99903 * 95.00035 * 3 2 1 5 5 C 1.47109 * 119.99878 * 171.59898 * 4 3 2 6 6 O 1.21616 * 119.99929 * 356.18790 * 5 4 3 7 7 N 1.34777 * 119.99968 * 176.18299 * 5 4 3 8 8 C 1.46933 * 120.64126 * 5.39350 * 7 5 4 9 9 C 1.53634 * 108.53370 * 126.29465 * 8 7 5 10 10 C 1.52997 * 109.27124 * 54.81116 * 9 8 7 11 11 C 1.52990 * 109.63471 * 298.65247 * 10 9 8 12 12 C 1.46934 * 120.64229 * 185.67641 * 7 5 4 13 13 C 1.53257 * 109.35822 * 178.71467 * 10 9 8 14 14 N 1.47153 * 108.40949 * 187.91074 * 13 10 9 15 15 C 1.36940 * 120.98868 * 230.49858 * 14 13 10 16 16 H 1.07991 * 119.99938 * 17.28815 * 15 14 13 17 17 C 1.38812 * 119.99697 * 197.29457 * 15 14 13 18 18 N 1.31620 * 120.00414 * 39.87230 * 17 15 14 19 19 Si 1.86800 * 119.99785 * 219.87656 * 17 15 14 20 20 H 1.48498 * 109.47512 * 94.99726 * 19 17 15 21 21 H 1.48504 * 109.46973 * 214.99599 * 19 17 15 22 22 H 1.48501 * 109.47362 * 334.99347 * 19 17 15 23 23 C 1.47154 * 118.02355 * 50.47200 * 14 13 10 24 24 C 1.53296 * 108.37693 * 309.40685 * 23 14 13 25 25 O 1.42896 * 109.55137 * 58.91289 * 10 9 8 26 26 C 1.50706 * 119.99989 * 275.00630 * 3 2 1 27 27 C 1.53003 * 109.46810 * 269.48569 * 26 3 2 28 28 H 1.08994 * 109.47128 * 60.00076 * 1 2 3 29 29 H 1.09005 * 109.46657 * 179.97438 * 1 2 3 30 30 H 1.09001 * 109.46439 * 299.99693 * 1 2 3 31 31 H 1.09006 * 109.46905 * 240.00297 * 2 1 3 32 32 H 1.08992 * 109.47635 * 120.00490 * 2 1 3 33 33 H 1.07998 * 120.00678 * 351.88014 * 4 3 2 34 34 H 1.08994 * 109.59175 * 246.12651 * 8 7 5 35 35 H 1.09000 * 109.59116 * 6.56027 * 8 7 5 36 36 H 1.08994 * 109.63028 * 294.80849 * 9 8 7 37 37 H 1.08998 * 109.44365 * 174.69876 * 9 8 7 38 38 H 1.08997 * 109.49185 * 301.25519 * 11 10 9 39 39 H 1.08996 * 109.51237 * 181.18680 * 11 10 9 40 40 H 1.08996 * 109.58464 * 353.43780 * 12 7 5 41 41 H 1.08999 * 109.58526 * 113.72040 * 12 7 5 42 42 H 1.08996 * 109.67939 * 307.64199 * 13 10 9 43 43 H 1.08998 * 109.67973 * 68.14556 * 13 10 9 44 44 H 0.96997 * 120.00083 * 179.97438 * 18 17 15 45 45 H 1.09003 * 109.68497 * 69.12951 * 23 14 13 46 46 H 1.09010 * 109.68279 * 189.68558 * 23 14 13 47 47 H 1.09000 * 109.51511 * 172.27653 * 24 23 14 48 48 H 1.08994 * 109.51157 * 292.37786 * 24 23 14 49 49 H 1.08997 * 109.47181 * 29.48326 * 26 3 2 50 50 H 1.08996 * 109.47029 * 149.49265 * 26 3 2 51 51 H 1.08999 * 109.47035 * 179.97438 * 27 26 3 52 52 H 1.08997 * 109.46986 * 300.00389 * 27 26 3 53 53 H 1.09005 * 109.47061 * 60.00059 * 27 26 3 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 6 2.0324 1.4208 0.0000 4 6 2.3487 2.0142 1.1473 5 6 3.0105 3.3280 1.1379 6 8 3.3309 3.8399 0.0823 7 7 3.2616 3.9644 2.2991 8 6 2.9888 3.3098 3.5860 9 6 4.2677 3.3520 4.4362 10 6 4.7466 4.8001 4.5566 11 6 5.0725 5.3509 3.1670 12 6 3.8078 5.3284 2.3027 13 6 6.0042 4.8483 5.4310 14 7 6.3362 6.2582 5.6904 15 6 7.6016 6.7356 5.4761 16 1 8.2927 6.1770 4.8624 17 6 7.9961 7.9375 6.0477 18 7 7.6286 8.2338 7.2764 19 14 9.0483 9.1344 5.0732 20 1 8.1751 10.1407 4.4174 21 1 9.9939 9.8214 5.9892 22 1 9.8124 8.3926 4.0383 23 6 5.2677 7.1401 6.1865 24 6 4.0471 6.9817 5.2727 25 8 3.7219 5.5942 5.1577 26 6 2.1762 2.1692 -1.3002 27 6 3.5839 1.9538 -1.8595 28 1 -0.3633 0.5138 -0.8899 29 1 -0.3633 -1.0277 -0.0005 30 1 -0.3632 0.5138 0.8901 31 1 1.8933 -0.5138 -0.8901 32 1 1.8934 -0.5139 0.8898 33 1 2.1238 1.5297 2.0860 34 1 2.1864 3.8375 4.1015 35 1 2.6964 2.2739 3.4144 36 1 5.0430 2.7508 3.9614 37 1 4.0566 2.9550 5.4292 38 1 5.8415 4.7339 2.7023 39 1 5.4334 6.3755 3.2569 40 1 4.0563 5.6251 1.2837 41 1 3.0693 6.0166 2.7139 42 1 5.8152 4.3362 6.3744 43 1 6.8316 4.3656 4.9109 44 1 7.9046 9.0735 7.6759 45 1 5.0024 6.8582 7.2055 46 1 5.6081 8.1755 6.1683 47 1 3.2006 7.5198 5.6992 48 1 4.2758 7.3856 4.2865 49 1 1.4408 1.8002 -2.0151 50 1 2.0129 3.2329 -1.1271 51 1 3.6878 2.4947 -2.8001 52 1 4.3193 2.3227 -1.1446 53 1 3.7473 0.8900 -2.0326 RHF calculation, no. of doubly occupied orbitals= 65 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 ZINC001725010835.mol2 53 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED SCF FIELD WAS ACHIEVED Wall clock time and date at job start Tue Mar 31 2020 19:57:06 Heat of formation + Delta-G solvation = -37.003263 kcal Electronic energy + Delta-G solvation = -31084.090374 eV Core-core repulsion = 27149.979585 eV Total energy + Delta-G solvation = -3934.110789 eV No. of doubly occupied orbitals = 65 Molecular weight (most abundant/longest-lived isotopes) = 336.220 amu Computer time = 1.33 seconds Orbital eigenvalues (eV) -40.47424 -39.20328 -36.97154 -35.87398 -34.39519 -32.60144 -32.06652 -31.35590 -31.16907 -29.81405 -28.44826 -26.56583 -25.00244 -23.62751 -23.46510 -23.28337 -22.76452 -21.21196 -19.92211 -18.73435 -17.96928 -17.40835 -16.87500 -15.80063 -15.42234 -15.34208 -15.16084 -14.78763 -14.67164 -14.37024 -14.28139 -13.97873 -13.88610 -13.59212 -13.50153 -13.21799 -13.03500 -12.82356 -12.75724 -12.40313 -12.18163 -11.97723 -11.96834 -11.84519 -11.58608 -11.52723 -11.29891 -11.05647 -11.00098 -10.89219 -10.79525 -10.71326 -10.55083 -10.27890 -10.22801 -9.83618 -9.53960 -9.32951 -9.22168 -9.11472 -8.43258 -8.28397 -6.93632 -5.96667 -3.11835 1.27254 3.14001 3.31329 3.36223 3.47195 3.48597 4.26086 4.39144 4.45961 4.51707 4.73949 4.89333 4.94899 4.97936 5.07868 5.16206 5.18187 5.27116 5.30041 5.35918 5.41599 5.45824 5.52337 5.54582 5.56086 5.58108 5.62464 5.72205 5.81056 5.85586 5.88363 5.96686 6.02537 6.07087 6.12105 6.15393 6.21404 6.28309 6.32709 6.37581 6.38683 6.48716 6.52099 6.54096 6.70333 6.83718 6.98433 7.29483 7.57932 7.77670 7.88376 8.20176 8.31580 9.03457 9.74680 10.30165 11.11265 Molecular weight = 336.22amu Principal moments of inertia in cm(-1) A = 0.021188 B = 0.002749 C = 0.002576 Principal moments of inertia in units of 10**(-40)*gram-cm**2 A = 1321.185393 B =10182.553285 C =10865.494584 Net atomic charges, atomic populations, and dipole contributions calculated with CM2 Atom NO. Type Charge No. of electrons 1 C -0.147 4.147 2 C -0.097 4.097 3 C -0.027 4.027 4 C -0.229 4.229 5 C 0.544 3.456 6 O -0.542 6.542 7 N -0.603 5.603 8 C 0.113 3.887 9 C -0.118 4.118 10 C 0.106 3.894 11 C -0.148 4.148 12 C 0.118 3.882 13 C 0.128 3.872 14 N -0.590 5.590 15 C -0.268 4.268 16 H 0.073 0.927 17 C 0.014 3.986 18 N -0.872 5.872 19 Si 0.871 3.129 20 H -0.287 1.287 21 H -0.294 1.294 22 H -0.277 1.277 23 C 0.137 3.863 24 C 0.039 3.961 25 O -0.380 6.380 26 C -0.100 4.100 27 C -0.131 4.131 28 H 0.057 0.943 29 H 0.059 0.941 30 H 0.057 0.943 31 H 0.077 0.923 32 H 0.074 0.926 33 H 0.127 0.873 34 H 0.076 0.924 35 H 0.081 0.919 36 H 0.076 0.924 37 H 0.080 0.920 38 H 0.068 0.932 39 H 0.093 0.907 40 H 0.086 0.914 41 H 0.067 0.933 42 H 0.025 0.975 43 H 0.060 0.940 44 H 0.255 0.745 45 H 0.026 0.974 46 H 0.082 0.918 47 H 0.080 0.920 48 H 0.046 0.954 49 H 0.056 0.944 50 H 0.101 0.899 51 H 0.052 0.948 52 H 0.066 0.934 53 H 0.041 0.959 For the charges calculated by CM2: Dipole moment (debyes) X Y Z Total from point charges -14.422 -14.687 -11.725 23.689 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 -0.204 4.204 2 C -0.134 4.134 3 C -0.029 4.029 4 C -0.250 4.250 5 C 0.336 3.664 6 O -0.423 6.423 7 N -0.336 5.336 8 C -0.010 4.010 9 C -0.156 4.156 10 C 0.065 3.935 11 C -0.186 4.186 12 C -0.004 4.004 13 C 0.001 3.999 14 N -0.313 5.313 15 C -0.396 4.396 16 H 0.090 0.910 17 C -0.187 4.187 18 N -0.513 5.513 19 Si 0.700 3.300 20 H -0.214 1.214 21 H -0.221 1.221 22 H -0.202 1.202 23 C 0.010 3.990 24 C -0.039 4.039 25 O -0.300 6.300 26 C -0.137 4.137 27 C -0.189 4.189 28 H 0.076 0.924 29 H 0.078 0.922 30 H 0.077 0.923 31 H 0.096 0.904 32 H 0.093 0.907 33 H 0.145 0.855 34 H 0.094 0.906 35 H 0.099 0.901 36 H 0.095 0.905 37 H 0.099 0.901 38 H 0.087 0.913 39 H 0.111 0.889 40 H 0.105 0.895 41 H 0.085 0.915 42 H 0.042 0.958 43 H 0.078 0.922 44 H 0.064 0.936 45 H 0.044 0.956 46 H 0.100 0.900 47 H 0.098 0.902 48 H 0.065 0.935 49 H 0.075 0.925 50 H 0.119 0.881 51 H 0.071 0.929 52 H 0.085 0.915 53 H 0.060 0.940 Dipole moment (debyes) X Y Z Total from point charges -14.350 -14.347 -12.069 23.610 hybrid contribution 0.870 0.882 -0.109 1.243 sum -13.480 -13.466 -12.178 22.613 Atomic orbital electron populations 1.21724 0.94320 1.01962 1.02432 1.20757 0.96589 0.92791 1.03251 1.22545 0.90576 0.94568 0.95251 1.22514 1.06737 0.96973 0.98728 1.18523 0.79252 0.85385 0.83268 1.90705 1.53233 1.68436 1.29940 1.48029 1.63471 1.16284 1.05766 1.21817 0.98034 0.97610 0.83513 1.21944 0.97573 0.95577 1.00542 1.21807 0.89736 0.89896 0.92044 1.22340 0.96900 1.04181 0.95223 1.21552 0.95519 0.82093 1.01216 1.21491 0.94312 0.87895 0.96215 1.44200 1.06913 1.03133 1.77102 1.19056 0.90567 1.04663 1.25303 0.90961 1.24632 0.98388 1.00993 0.94709 1.70412 1.47841 1.23304 1.09790 0.86727 0.79828 0.82488 0.80972 1.21409 1.22053 1.20218 1.21367 0.86532 0.96973 0.94081 1.23231 0.98989 0.81786 0.99876 1.87771 1.41047 1.19448 1.81716 1.20933 0.97758 1.02144 0.92859 1.21541 0.96551 0.99883 1.00892 0.92399 0.92200 0.92344 0.90423 0.90729 0.85499 0.90592 0.90073 0.90502 0.90115 0.91347 0.88884 0.89527 0.91485 0.95753 0.92158 0.93567 0.95577 0.89975 0.90224 0.93548 0.92501 0.88134 0.92874 0.91494 0.93992 Number of geometries 1 Number of calculations of the screened coulomb radii 1 The total number of SCF iterations 21. 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 -0.89 9.89 37.16 0.37 -0.53 16 2 C -0.10 -0.67 6.10 -27.88 -0.17 -0.84 16 3 C -0.03 -0.26 4.61 -101.17 -0.47 -0.73 16 4 C -0.23 -2.44 8.90 -37.80 -0.34 -2.78 16 5 C 0.54 7.48 7.51 -12.66 -0.10 7.38 16 6 O -0.54 -8.69 10.80 5.26 0.06 -8.63 16 7 N -0.60 -8.20 2.97 -173.87 -0.52 -8.71 16 8 C 0.11 1.32 6.11 -3.48 -0.02 1.30 16 9 C -0.12 -1.55 5.12 -26.40 -0.14 -1.69 16 10 C 0.11 1.78 0.68 -90.49 -0.06 1.72 16 11 C -0.15 -2.46 4.33 -26.63 -0.12 -2.58 16 12 C 0.12 1.78 6.20 -3.70 -0.02 1.76 16 13 C 0.13 2.58 5.39 -3.55 -0.02 2.56 16 14 N -0.59 -14.21 2.58 -171.85 -0.44 -14.65 16 15 C -0.27 -7.18 9.56 -15.06 -0.14 -7.32 16 16 H 0.07 1.94 8.00 -52.49 -0.42 1.52 16 17 C 0.01 0.37 4.34 -17.43 -0.08 0.30 16 18 N -0.87 -24.94 12.17 55.49 0.68 -24.26 16 19 Si 0.87 21.10 29.69 -169.99 -5.05 16.05 16 20 H -0.29 -6.95 7.11 56.52 0.40 -6.55 16 21 H -0.29 -7.21 7.11 56.52 0.40 -6.81 16 22 H -0.28 -6.64 7.11 56.52 0.40 -6.24 16 23 C 0.14 3.13 5.78 -3.53 -0.02 3.11 16 24 C 0.04 0.72 6.60 37.31 0.25 0.97 16 25 O -0.38 -6.78 9.00 -35.23 -0.32 -7.09 16 26 C -0.10 -1.06 5.33 -27.88 -0.15 -1.21 16 27 C -0.13 -1.43 9.39 37.16 0.35 -1.08 16 28 H 0.06 0.36 8.14 -51.93 -0.42 -0.06 16 29 H 0.06 0.29 8.14 -51.93 -0.42 -0.13 16 30 H 0.06 0.37 8.14 -51.93 -0.42 -0.05 16 31 H 0.08 0.49 8.14 -51.93 -0.42 0.07 16 32 H 0.07 0.47 8.03 -51.93 -0.42 0.05 16 33 H 0.13 1.09 5.92 -52.49 -0.31 0.78 16 34 H 0.08 0.92 7.82 -51.93 -0.41 0.52 16 35 H 0.08 0.73 5.38 -51.93 -0.28 0.46 16 36 H 0.08 0.97 8.14 -51.93 -0.42 0.54 16 37 H 0.08 1.00 8.14 -51.93 -0.42 0.58 16 38 H 0.07 1.15 8.14 -51.93 -0.42 0.73 16 39 H 0.09 1.76 6.16 -51.93 -0.32 1.45 16 40 H 0.09 1.37 7.00 -51.93 -0.36 1.00 16 41 H 0.07 1.02 7.83 -51.93 -0.41 0.61 16 42 H 0.02 0.51 8.14 -51.93 -0.42 0.09 16 43 H 0.06 1.20 7.91 -51.93 -0.41 0.79 16 44 H 0.25 7.00 8.31 -40.82 -0.34 6.66 16 45 H 0.03 0.64 8.14 -51.93 -0.42 0.22 16 46 H 0.08 2.07 6.24 -51.92 -0.32 1.74 16 47 H 0.08 1.30 8.14 -51.93 -0.42 0.88 16 48 H 0.05 0.85 6.29 -51.93 -0.33 0.53 16 49 H 0.06 0.50 8.12 -51.93 -0.42 0.08 16 50 H 0.10 1.31 5.77 -51.93 -0.30 1.01 16 51 H 0.05 0.55 8.14 -51.93 -0.42 0.13 16 52 H 0.07 0.89 6.62 -51.93 -0.34 0.54 16 53 H 0.04 0.39 8.14 -51.93 -0.42 -0.04 16 LS Contribution 397.47 15.07 5.99 5.99 Total: -1.00 -30.15 397.47 -9.73 -39.88 By element: Atomic # 1 Polarization: 10.35 SS G_CDS: -9.26 Total: 1.09 kcal Atomic # 6 Polarization: 1.22 SS G_CDS: -0.87 Total: 0.35 kcal Atomic # 7 Polarization: -47.34 SS G_CDS: -0.28 Total: -47.63 kcal Atomic # 8 Polarization: -15.47 SS G_CDS: -0.26 Total: -15.73 kcal Atomic # 14 Polarization: 21.10 SS G_CDS: -5.05 Total: 16.05 kcal Total LS contribution 5.99 Total: 5.99 kcal Total: -30.15 -9.73 -39.88 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. ZINC001725010835.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 2.874 kcal (2) G-P(sol) polarization free energy of solvation -30.150 kcal (3) G-ENP(sol) elect.-nuc.-pol. free energy of system -27.275 kcal (4) G-CDS(sol) cavity-dispersion-solvent structure free energy -9.728 kcal (5) G-P-CDS(sol) = G-P(sol) + G-CDS(sol) = (2) + (4) -39.878 kcal (6) G-S(sol) free energy of system = (1) + (5) -37.003 kcal 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED Total computer time = 1.34 seconds