Wall clock time and date at job start Sun Mar 7 2021 03:18:46 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 1.42901 * 1 3 3 C 1.35654 * 117.00181 * 2 1 4 4 C 1.38400 * 120.12020 * 0.02708 * 3 2 1 5 5 C 1.38732 * 120.02894 * 179.97438 * 4 3 2 6 6 O 1.35710 * 119.85946 * 179.97438 * 5 4 3 7 7 C 1.42903 * 117.00115 * 0.02562 * 6 5 4 8 8 C 1.39139 * 120.27223 * 0.02562 * 5 4 3 9 9 C 1.50704 * 119.87834 * 180.02562 * 8 5 4 10 10 O 1.42907 * 109.47195 * 285.00173 * 9 8 5 11 11 Si 1.86292 * 109.47309 * 165.00043 * 9 8 5 12 12 C 1.37581 * 120.24702 * 359.74465 * 8 5 4 13 13 C 1.39818 * 119.95879 * 0.48814 * 12 8 5 14 14 C 1.47297 * 120.13675 * 179.78907 * 13 12 8 15 15 O 1.21622 * 120.00166 * 179.72372 * 14 13 12 16 16 N 1.34775 * 120.00072 * 359.72571 * 14 13 12 17 17 C 1.46500 * 120.00366 * 179.97438 * 16 14 13 18 18 H 1.09000 * 109.47175 * 34.99887 * 17 16 14 19 19 C 1.53006 * 109.46998 * 154.99756 * 17 16 14 20 20 C 1.52999 * 109.46626 * 179.97438 * 19 17 16 21 21 C 1.52997 * 109.47592 * 300.00035 * 20 19 17 22 22 H 1.09000 * 109.47140 * 300.00346 * 21 20 19 23 23 C 1.50699 * 109.47265 * 180.02562 * 21 20 19 24 24 N 1.30634 * 119.25597 * 265.00168 * 23 21 20 25 25 C 1.33526 * 121.50676 * 179.97438 * 24 23 21 26 26 C 1.36201 * 119.90954 * 359.97438 * 25 24 23 27 27 C 1.41020 * 118.58910 * 359.97438 * 26 25 24 28 28 O 1.21982 * 120.70180 * 180.02562 * 27 26 25 29 29 N 1.34750 * 119.25239 * 84.72901 * 23 21 20 30 30 C 1.52996 * 109.47165 * 60.00300 * 21 20 19 31 31 C 1.52997 * 109.47204 * 274.99782 * 17 16 14 32 32 H 1.09000 * 109.46831 * 299.99835 * 1 2 3 33 33 H 1.09000 * 109.46971 * 59.99545 * 1 2 3 34 34 H 1.08994 * 109.47470 * 179.97438 * 1 2 3 35 35 H 1.07993 * 119.98760 * 359.97019 * 4 3 2 36 36 H 1.08999 * 109.46918 * 299.99155 * 7 6 5 37 37 H 1.08999 * 109.47186 * 59.99828 * 7 6 5 38 38 H 1.09005 * 109.46824 * 179.97438 * 7 6 5 39 39 H 1.08997 * 109.47002 * 44.99824 * 9 8 5 40 40 H 0.96698 * 113.99589 * 300.00185 * 10 9 8 41 41 H 1.48503 * 110.00073 * 58.68105 * 11 9 8 42 42 H 1.48507 * 110.00187 * 180.02562 * 11 9 8 43 43 H 1.07993 * 120.02622 * 180.28011 * 12 8 5 44 44 H 0.97001 * 119.99752 * 359.97438 * 16 14 13 45 45 H 1.08993 * 109.46955 * 300.00226 * 19 17 16 46 46 H 1.09000 * 109.47050 * 60.00054 * 19 17 16 47 47 H 1.09000 * 109.47160 * 60.00369 * 20 19 17 48 48 H 1.09002 * 109.46719 * 180.02562 * 20 19 17 49 49 H 1.08005 * 120.04220 * 180.02562 * 25 24 23 50 50 H 1.08001 * 120.70256 * 179.97438 * 26 25 24 51 51 H 0.96997 * 120.04146 * 359.97438 * 29 23 21 52 52 H 1.08992 * 109.47534 * 180.02562 * 30 21 20 53 53 H 1.08996 * 109.47134 * 59.99508 * 30 21 20 54 54 H 1.09000 * 109.47140 * 300.00127 * 31 17 16 55 55 H 1.09001 * 109.47230 * 59.99271 * 31 17 16 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 2.0449 1.2087 0.0000 4 6 1.2936 2.3710 0.0006 5 6 1.9254 3.6061 0.0011 6 8 1.1854 4.7436 0.0011 7 6 -0.2357 4.5931 0.0012 8 6 3.3147 3.6832 0.0005 9 6 3.9918 5.0296 0.0017 10 8 3.8937 5.6133 -1.2990 11 14 5.7867 4.8217 0.4552 12 6 4.0726 2.5350 0.0047 13 6 3.4462 1.2850 -0.0007 14 6 4.2538 0.0531 -0.0009 15 8 3.7064 -1.0329 -0.0006 16 7 5.5994 0.1295 -0.0015 17 6 6.4027 -1.0956 -0.0011 18 1 5.8977 -1.8614 -0.5900 19 6 7.7755 -0.8055 -0.6115 20 6 8.6145 -2.0849 -0.6105 21 6 8.7896 -2.5790 0.8269 22 1 9.2944 -1.8130 1.4155 23 6 9.6166 -3.8388 0.8278 24 7 9.0142 -4.9980 0.8289 25 6 9.7026 -6.1421 0.8293 26 6 11.0643 -6.1154 0.8280 27 6 11.7147 -4.8642 0.8257 28 8 12.9326 -4.7953 0.8241 29 7 10.9608 -3.7441 0.8220 30 6 7.4169 -2.8691 1.4372 31 6 6.5778 -1.5903 1.4361 32 1 -0.3633 0.5138 0.8900 33 1 -0.3633 0.5139 -0.8899 34 1 -0.3634 -1.0276 -0.0005 35 1 0.2150 2.3165 0.0005 36 1 -0.5429 4.0440 -0.8889 37 1 -0.5429 4.0438 0.8911 38 1 -0.7052 5.5769 0.0016 39 1 3.5062 5.6799 0.7293 40 1 4.3055 5.0874 -1.9982 41 1 6.4526 3.9116 -0.5111 42 1 6.4656 6.1425 0.4605 43 1 5.1506 2.5991 0.0089 44 1 6.0360 0.9957 -0.0021 45 1 7.6507 -0.4531 -1.6353 46 1 8.2804 -0.0398 -0.0226 47 1 8.1097 -2.8510 -1.1991 48 1 9.5927 -1.8782 -1.0449 49 1 9.1802 -7.0874 0.8297 50 1 11.6338 -7.0331 0.8287 51 1 11.3861 -2.8724 0.8168 52 1 7.5415 -3.2207 2.4613 53 1 6.9121 -3.6350 0.8486 54 1 7.0828 -0.8245 2.0249 55 1 5.5998 -1.7968 1.8709 There are 77 doubly filled levels RHF calculation, no. of doubly occupied orbitals= 77 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). 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 s_22_13456076_12297780.mol2 55 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 03:18:46 Heat of formation + Delta-G solvation = -107.277447 kcal Electronic energy + Delta-G solvation = -40436.442882 eV Core-core repulsion = 35213.182735 eV Total energy + Delta-G solvation = -5223.260147 eV No. of doubly occupied orbitals = 77 and no. of open levels = 1 Molecular weight (most abundant/longest-lived isotopes) = 416.187 amu Computer time = 1.95 seconds Orbital eigenvalues (eV) -42.87060 -42.07319 -40.81875 -40.03865 -39.42050 -38.54853 -38.32958 -37.03372 -35.79762 -35.08730 -32.74728 -32.22416 -31.80567 -31.58648 -29.91964 -28.96380 -28.10396 -26.14880 -25.89361 -25.37155 -24.44685 -23.66336 -23.03051 -22.25217 -21.41164 -20.83471 -20.01811 -19.73866 -19.13446 -18.78679 -18.19584 -17.98226 -17.76493 -17.20329 -17.13347 -17.01410 -16.60557 -16.51078 -16.28203 -16.05014 -15.79346 -15.78703 -15.68766 -15.57875 -15.39674 -15.17067 -15.06132 -14.62257 -14.44305 -14.18569 -14.10332 -14.05761 -13.78807 -13.55424 -13.34537 -13.17943 -13.09265 -12.67115 -12.52335 -12.50520 -12.42089 -12.27617 -12.16559 -12.07510 -12.00743 -11.75076 -11.64666 -11.50201 -11.36266 -11.27351 -11.04445 -10.79727 -10.50854 -10.01812 -9.88179 -9.64627 -9.15557 -4.86586 -0.43064 -0.21470 0.11327 0.70671 1.34792 1.58709 1.59103 1.79638 2.03020 2.15143 2.16120 2.21983 2.52978 2.65937 2.81830 3.44529 3.47169 3.50542 3.59079 3.65209 3.72854 3.74598 3.77627 3.85414 4.05245 4.14543 4.17621 4.22630 4.24362 4.27094 4.28360 4.29480 4.30807 4.31871 4.43646 4.46794 4.52863 4.59708 4.60010 4.65258 4.68509 4.73119 4.79276 4.88240 4.90905 4.94746 5.05955 5.09231 5.13741 5.24236 5.30193 5.33774 5.36747 5.39310 5.48664 5.51983 5.65480 6.06171 6.31952 6.59779 6.62632 6.69707 6.74604 7.34576 Net atomic charges, atomic populations, and dipole contributions calculated with CM2 Atom NO. Type Charge No. of electrons 1 C 0.011 3.989 2 O -0.303 6.303 3 C 0.216 3.784 4 C -0.313 4.313 5 C 0.213 3.787 6 O -0.313 6.313 7 C 0.012 3.988 8 C -0.198 4.198 9 C -0.075 4.075 10 O -0.548 6.548 11 Si 0.764 3.236 12 C 0.002 3.998 13 C -0.226 4.226 14 C 0.564 3.436 15 O -0.563 6.563 16 N -0.715 5.715 17 C 0.144 3.856 18 H 0.064 0.936 19 C -0.117 4.117 20 C -0.104 4.104 21 C -0.040 4.040 22 H 0.135 0.865 23 C 0.411 3.589 24 N -0.548 5.548 25 C 0.172 3.828 26 C -0.319 4.319 27 C 0.510 3.490 28 O -0.593 6.593 29 N -0.613 5.613 30 C -0.090 4.090 31 C -0.123 4.123 32 H 0.072 0.928 33 H 0.068 0.932 34 H 0.112 0.888 35 H 0.160 0.840 36 H 0.065 0.935 37 H 0.071 0.929 38 H 0.118 0.882 39 H 0.110 0.890 40 H 0.384 0.616 41 H -0.247 1.247 42 H -0.304 1.304 43 H 0.166 0.834 44 H 0.410 0.590 45 H 0.080 0.920 46 H 0.103 0.897 47 H 0.064 0.936 48 H 0.088 0.912 49 H 0.195 0.805 50 H 0.158 0.842 51 H 0.430 0.570 52 H 0.071 0.929 53 H 0.068 0.932 54 H 0.090 0.910 55 H 0.049 0.951 For the charges calculated by CM2: Dipole moment (debyes) X Y Z Total from point charges -4.618 4.929 1.718 6.969 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 -0.084 4.084 2 O -0.214 6.214 3 C 0.167 3.833 4 C -0.332 4.332 5 C 0.165 3.835 6 O -0.225 6.225 7 C -0.082 4.082 8 C -0.199 4.199 9 C -0.183 4.183 10 O -0.355 6.355 11 Si 0.667 3.333 12 C -0.017 4.017 13 C -0.230 4.230 14 C 0.353 3.647 15 O -0.442 6.442 16 N -0.368 5.368 17 C 0.040 3.960 18 H 0.082 0.918 19 C -0.155 4.155 20 C -0.143 4.143 21 C -0.060 4.060 22 H 0.153 0.847 23 C 0.146 3.854 24 N -0.271 5.271 25 C 0.033 3.967 26 C -0.343 4.343 27 C 0.311 3.689 28 O -0.475 6.475 29 N -0.251 5.251 30 C -0.129 4.129 31 C -0.162 4.162 32 H 0.090 0.910 33 H 0.087 0.913 34 H 0.131 0.869 35 H 0.178 0.822 36 H 0.084 0.916 37 H 0.090 0.910 38 H 0.136 0.864 39 H 0.128 0.872 40 H 0.233 0.767 41 H -0.172 1.172 42 H -0.232 1.232 43 H 0.183 0.817 44 H 0.248 0.752 45 H 0.099 0.901 46 H 0.121 0.879 47 H 0.083 0.917 48 H 0.107 0.893 49 H 0.212 0.788 50 H 0.176 0.824 51 H 0.271 0.729 52 H 0.089 0.911 53 H 0.087 0.913 54 H 0.109 0.891 55 H 0.068 0.932 Dipole moment (debyes) X Y Z Total from point charges -4.476 4.359 1.788 6.499 hybrid contribution 0.113 0.345 -1.235 1.287 sum -4.363 4.704 0.553 6.440 Atomic orbital electron populations 1.23452 0.76673 1.05687 1.02540 1.86364 1.23049 1.25937 1.86046 1.19011 0.91260 0.84590 0.88442 1.21415 1.01937 0.90890 1.18947 1.18956 0.91047 0.84811 0.88727 1.86141 1.20994 1.28810 1.86536 1.23451 0.76376 1.05779 1.02555 1.19507 0.90717 0.96643 1.13056 1.25164 1.12955 0.92389 0.87772 1.86620 1.80816 1.50793 1.17318 0.94311 0.70810 0.79587 0.88593 1.21011 1.00338 0.88775 0.91527 1.19189 0.90700 0.94038 1.19044 1.18004 0.82717 0.88174 0.75844 1.90830 1.72383 1.30229 1.50762 1.45842 1.04942 1.10535 1.75475 1.21042 0.91675 0.86308 0.96990 0.91755 1.21768 0.92852 0.98205 1.02675 1.21524 1.01658 0.97714 0.93451 1.20693 0.95421 0.89768 1.00122 0.84695 1.23727 0.80416 0.96935 0.84290 1.68400 1.37691 0.97035 1.24010 1.23155 0.90946 0.97564 0.85078 1.22999 0.97031 0.98005 1.16286 1.17618 0.87192 0.85995 0.78121 1.90989 1.14479 1.87355 1.54721 1.44596 1.07995 1.12844 1.59640 1.21270 0.92637 0.97495 1.01517 1.21876 1.00021 0.97927 0.96371 0.90985 0.91315 0.86946 0.82238 0.91599 0.91011 0.86374 0.87174 0.76735 1.17209 1.23185 0.81739 0.75232 0.90105 0.87899 0.91693 0.89304 0.78799 0.82432 0.72918 0.91065 0.91323 0.89110 0.93237 Number of geometries 1 Number of calculations of the screened coulomb radii 1 The total number of SCF iterations 14. 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 0.01 -0.02 9.81 113.37 1.11 1.09 16 2 O -0.30 -2.15 8.56 -68.73 -0.59 -2.74 16 3 C 0.22 0.99 6.70 22.82 0.15 1.15 16 4 C -0.31 -0.20 8.01 22.43 0.18 -0.03 16 5 C 0.21 0.28 6.67 22.60 0.15 0.43 16 6 O -0.31 -0.48 9.80 -90.31 -0.89 -1.36 16 7 C 0.01 -0.07 9.80 113.37 1.11 1.04 16 8 C -0.20 0.19 5.27 -19.80 -0.10 0.08 16 9 C -0.08 0.13 2.37 71.24 0.17 0.29 16 10 O -0.55 -1.00 12.88 -148.98 -1.92 -2.92 16 11 Si 0.76 -5.02 30.23 68.60 2.07 -2.94 16 12 C 0.00 -0.01 8.14 22.50 0.18 0.18 16 13 C -0.23 -0.62 5.89 -20.00 -0.12 -0.74 16 14 C 0.56 2.78 7.72 86.63 0.67 3.45 16 15 O -0.56 -7.83 14.81 16.86 0.25 -7.58 16 16 N -0.72 2.54 5.03 -445.92 -2.24 0.30 16 17 C 0.14 -0.64 2.46 44.99 0.11 -0.53 16 18 H 0.06 0.13 7.58 -2.39 -0.02 0.11 16 19 C -0.12 1.29 5.39 30.60 0.16 1.45 16 20 C -0.10 1.05 5.18 30.59 0.16 1.21 16 21 C -0.04 0.38 2.48 -11.54 -0.03 0.35 16 22 H 0.14 -2.08 8.14 -2.39 -0.02 -2.10 16 23 C 0.41 -1.53 6.73 138.18 0.93 -0.60 16 24 N -0.55 0.15 9.12 -187.55 -1.71 -1.56 16 25 C 0.17 -0.11 11.20 83.96 0.94 0.83 16 26 C -0.32 -1.08 10.07 22.48 0.23 -0.85 16 27 C 0.51 3.59 7.75 84.89 0.66 4.24 16 28 O -0.59 -9.64 17.97 -5.26 -0.09 -9.74 16 29 N -0.61 1.16 5.25 -310.70 -1.63 -0.47 16 30 C -0.09 0.50 4.67 30.58 0.14 0.64 16 31 C -0.12 0.63 5.49 30.58 0.17 0.79 16 32 H 0.07 -0.38 7.66 -2.39 -0.02 -0.40 16 33 H 0.07 -0.33 7.66 -2.39 -0.02 -0.35 16 34 H 0.11 -0.42 8.14 -2.39 -0.02 -0.44 16 35 H 0.16 -0.62 4.50 -2.91 -0.01 -0.63 16 36 H 0.07 -0.46 7.65 -2.39 -0.02 -0.48 16 37 H 0.07 -0.57 7.65 -2.39 -0.02 -0.59 16 38 H 0.12 -0.96 8.14 -2.38 -0.02 -0.98 16 39 H 0.11 -0.07 7.82 -2.39 -0.02 -0.09 16 40 H 0.38 -1.84 8.70 -74.06 -0.64 -2.48 16 41 H -0.25 1.99 6.69 99.48 0.67 2.65 16 42 H -0.30 -0.66 7.11 99.48 0.71 0.05 16 43 H 0.17 -1.58 3.16 -2.91 -0.01 -1.58 16 44 H 0.41 -4.13 6.62 -92.71 -0.61 -4.74 16 45 H 0.08 -0.85 8.14 -2.39 -0.02 -0.87 16 46 H 0.10 -1.64 8.14 -2.39 -0.02 -1.66 16 47 H 0.06 -0.40 8.14 -2.39 -0.02 -0.42 16 48 H 0.09 -1.10 8.14 -2.39 -0.02 -1.12 16 49 H 0.20 -1.27 8.06 -2.91 -0.02 -1.29 16 50 H 0.16 0.35 8.06 -2.91 -0.02 0.33 16 51 H 0.43 -3.09 8.78 -92.71 -0.81 -3.91 16 52 H 0.07 -0.34 8.14 -2.39 -0.02 -0.36 16 53 H 0.07 -0.07 7.76 -2.39 -0.02 -0.09 16 54 H 0.09 -0.87 8.14 -2.39 -0.02 -0.89 16 55 H 0.05 0.07 8.14 -2.39 -0.02 0.05 16 Total: 0.00 -35.93 442.29 -0.86 -36.79 By element: Atomic # 1 Polarization: -21.16 SS G_CDS: -1.09 Total: -22.26 kcal Atomic # 6 Polarization: 7.51 SS G_CDS: 6.98 Total: 14.49 kcal Atomic # 7 Polarization: 3.85 SS G_CDS: -5.58 Total: -1.73 kcal Atomic # 8 Polarization: -21.11 SS G_CDS: -3.24 Total: -24.34 kcal Atomic # 14 Polarization: -5.02 SS G_CDS: 2.07 Total: -2.94 kcal Total: -35.93 -0.86 -36.79 kcal The number of atoms in the molecule is 55 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_13456076_12297780.mol2 55 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 -70.489 kcal (2) G-P(sol) polarization free energy of solvation -35.927 kcal (3) G-ENP(sol) elect.-nuc.-pol. free energy of system -106.416 kcal (4) G-CDS(sol) cavity-dispersion-solvent structure free energy -0.861 kcal (5) G-P-CDS(sol) = G-P(sol) + G-CDS(sol) = (2) + (4) -36.788 kcal (6) G-S(sol) free energy of system = (1) + (5) -107.277 kcal 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED Total computer time = 1.95 seconds