Wall clock time and date at job start Wed Apr 1 2020 04:55:31 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 1.53004 * 1 3 3 C 1.53004 * 109.46821 * 2 1 4 4 C 1.52997 * 109.46786 * 119.99816 * 2 1 3 5 5 N 1.46499 * 109.47373 * 64.99989 * 4 2 1 6 6 C 1.35039 * 124.88326 * 124.99664 * 5 4 2 7 7 C 1.35362 * 107.22755 * 180.22351 * 6 5 4 8 8 C 1.41505 * 105.50418 * 359.63738 * 7 6 5 9 9 C 1.47708 * 126.51818 * 180.10324 * 8 7 6 10 10 O 1.21566 * 120.00392 * 0.29014 * 9 8 7 11 11 N 1.34781 * 119.99674 * 180.29018 * 9 8 7 12 12 C 1.46501 * 119.99497 * 180.02562 * 11 9 8 13 13 C 1.53574 * 112.24696 * 61.01602 * 12 11 9 14 14 C 1.54223 * 106.67920 * 121.16348 * 13 12 11 15 15 C 1.54759 * 104.15319 * 24.94798 * 14 13 12 16 16 C 1.54778 * 103.21304 * 322.18743 * 15 14 13 17 17 H 1.09003 * 111.41765 * 275.31628 * 16 15 14 18 18 N 1.46974 * 109.16486 * 150.41074 * 16 15 14 19 19 C 1.36943 * 125.58333 * 65.65636 * 18 16 15 20 20 H 1.07998 * 119.99641 * 0.02562 * 19 18 16 21 21 C 1.38809 * 120.00069 * 180.02562 * 19 18 16 22 22 N 1.31617 * 120.00325 * 0.02562 * 21 19 18 23 23 Si 1.86806 * 119.99638 * 180.02562 * 21 19 18 24 24 H 1.48490 * 109.47407 * 359.97438 * 23 21 19 25 25 H 1.48500 * 109.46704 * 120.00024 * 23 21 19 26 26 H 1.48500 * 109.46584 * 239.99690 * 23 21 19 27 27 C 1.47369 * 108.84165 * 245.64341 * 18 16 15 28 28 C 1.54912 * 112.33305 * 297.64142 * 12 11 9 29 29 N 1.28462 * 124.88472 * 304.97664 * 5 4 2 30 30 H 1.08998 * 109.47054 * 180.02562 * 1 2 3 31 31 H 1.08999 * 109.47160 * 300.00160 * 1 2 3 32 32 H 1.09001 * 109.47086 * 59.99836 * 1 2 3 33 33 H 1.08999 * 109.47160 * 239.99839 * 2 1 3 34 34 H 1.08997 * 109.46438 * 179.97438 * 3 2 1 35 35 H 1.08997 * 109.46996 * 299.99772 * 3 2 1 36 36 H 1.08999 * 109.47385 * 59.99977 * 3 2 1 37 37 H 1.09000 * 109.47273 * 304.99726 * 4 2 1 38 38 H 1.09004 * 109.46932 * 185.00262 * 4 2 1 39 39 H 1.08002 * 126.38339 * 359.95603 * 6 5 4 40 40 H 1.07997 * 127.25122 * 179.75010 * 7 6 5 41 41 H 0.97002 * 120.00334 * 359.97438 * 11 9 8 42 42 H 1.08996 * 110.01917 * 240.47286 * 13 12 11 43 43 H 1.09009 * 110.01830 * 1.81411 * 13 12 11 44 44 H 1.09007 * 110.49008 * 143.61282 * 14 13 12 45 45 H 1.08996 * 110.49486 * 266.27613 * 14 13 12 46 46 H 1.08998 * 110.67372 * 80.61748 * 15 14 13 47 47 H 1.08998 * 110.66754 * 203.58958 * 15 14 13 48 48 H 0.96994 * 120.00174 * 179.97438 * 22 21 19 49 49 H 1.08997 * 110.37325 * 143.52155 * 27 18 16 50 50 H 1.08997 * 110.37076 * 265.85858 * 27 18 16 51 51 H 1.08998 * 110.96887 * 31.90801 * 28 12 11 52 52 H 1.08996 * 110.97164 * 155.67420 * 28 12 11 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 2.0400 1.4426 0.0000 4 6 2.0399 -0.7212 1.2493 5 7 1.6524 -2.1328 1.1907 6 6 2.5075 -3.1732 1.2899 7 6 1.7742 -4.3062 1.1851 8 6 0.4352 -3.8769 1.0267 9 6 -0.7525 -4.7412 0.8720 10 8 -0.6292 -5.9506 0.8785 11 7 -1.9730 -4.1890 0.7235 12 6 -3.1511 -5.0464 0.5706 13 6 -3.3721 -5.9537 1.7898 14 6 -4.7738 -5.6214 2.3405 15 6 -5.5362 -5.0557 1.1184 16 6 -4.4561 -4.2297 0.3789 17 1 -4.3715 -3.2246 0.7921 18 7 -4.7544 -4.2240 -1.0602 19 6 -5.8470 -3.6414 -1.6452 20 1 -6.5781 -3.1312 -1.0357 21 6 -6.0148 -3.7067 -3.0216 22 7 -5.1241 -4.3289 -3.7644 23 14 -7.5048 -2.9113 -3.8196 24 1 -8.3493 -2.2810 -2.7734 25 1 -7.0557 -1.8757 -4.7844 26 1 -8.2941 -3.9458 -4.5353 27 6 -3.6851 -4.9475 -1.7708 28 6 -3.0808 -5.9212 -0.7060 29 7 0.4501 -2.5589 1.0379 30 1 -0.3633 -1.0276 0.0005 31 1 -0.3633 0.5139 0.8900 32 1 -0.3633 0.5139 -0.8900 33 1 1.8934 -0.5139 -0.8900 34 1 3.1299 1.4425 0.0005 35 1 1.6767 1.9563 -0.8900 36 1 1.6766 1.9564 0.8900 37 1 1.6053 -0.2616 2.1370 38 1 3.1263 -0.6443 1.2952 39 1 3.5775 -3.1126 1.4232 40 1 2.1349 -5.3236 1.2175 41 1 -2.0715 -3.2240 0.7187 42 1 -3.3279 -7.0004 1.4889 43 1 -2.6151 -5.7514 2.5476 44 1 -5.2618 -6.5230 2.7109 45 1 -4.7062 -4.8716 3.1288 46 1 -5.9027 -5.8639 0.4856 47 1 -6.3591 -4.4174 1.4401 48 1 -5.2415 -4.3749 -4.7261 49 1 -4.0992 -5.5116 -2.6065 50 1 -2.9242 -4.2506 -2.1222 51 1 -2.0496 -6.1834 -0.9428 52 1 -3.6947 -6.8155 -0.6003 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 ZINC000990891049.mol2 52 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED SCF FIELD WAS ACHIEVED Wall clock time and date at job start Wed Apr 1 2020 04:55:31 Heat of formation + Delta-G solvation = 67.917807 kcal Electronic energy + Delta-G solvation = -31929.966375 eV Core-core repulsion = 27931.783394 eV Total energy + Delta-G solvation = -3998.182981 eV No. of doubly occupied orbitals = 66 Molecular weight (most abundant/longest-lived isotopes) = 346.211 amu Computer time = 1.24 seconds Orbital eigenvalues (eV) -42.71258 -39.92966 -37.86907 -36.68145 -34.17551 -33.34786 -32.25521 -31.32165 -30.77056 -29.63913 -27.34068 -27.19108 -26.65639 -25.75701 -23.80032 -23.11736 -21.56219 -20.91633 -20.47511 -19.91579 -19.28981 -18.62241 -17.76338 -16.92936 -16.64234 -16.08756 -15.59353 -15.18460 -14.90091 -14.48712 -14.20224 -14.05362 -13.98180 -13.69119 -13.47973 -13.38258 -13.00614 -12.87073 -12.73321 -12.59560 -12.30677 -12.11664 -11.76948 -11.68815 -11.58638 -11.26266 -11.11291 -11.08686 -10.93445 -10.81110 -10.60494 -10.45850 -10.42704 -10.10523 -10.01674 -9.88703 -9.68746 -9.57233 -9.36078 -9.24866 -9.05776 -8.61038 -8.40304 -6.79665 -5.59618 -3.02694 1.68578 2.15636 2.33887 3.41682 3.47038 3.49747 3.53862 3.72219 4.10302 4.33153 4.51317 4.60349 4.65781 4.75635 4.92089 4.98286 5.03270 5.20266 5.24755 5.34210 5.41191 5.44286 5.57302 5.57420 5.64947 5.70119 5.72412 5.76110 5.88086 5.91268 5.95402 5.97978 6.07517 6.17047 6.22358 6.26127 6.37265 6.44386 6.49189 6.51011 6.63082 6.67002 6.74543 6.86164 6.87327 7.07533 7.22307 7.62428 7.70353 7.78460 7.93458 8.07608 8.42291 8.62257 9.26678 9.87615 10.52405 11.42801 Molecular weight = 346.21amu Principal moments of inertia in cm(-1) A = 0.009766 B = 0.003538 C = 0.002884 Principal moments of inertia in units of 10**(-40)*gram-cm**2 A = 2866.259994 B = 7913.241447 C = 9705.209891 Net atomic charges, atomic populations, and dipole contributions calculated with CM2 Atom NO. Type Charge No. of electrons 1 C -0.161 4.161 2 C -0.108 4.108 3 C -0.145 4.145 4 C 0.124 3.876 5 N -0.282 5.282 6 C -0.025 4.025 7 C -0.179 4.179 8 C -0.014 4.014 9 C 0.602 3.398 10 O -0.533 6.533 11 N -0.691 5.691 12 C 0.161 3.839 13 C -0.112 4.112 14 C -0.124 4.124 15 C -0.130 4.130 16 C 0.163 3.837 17 H 0.045 0.955 18 N -0.594 5.594 19 C -0.218 4.218 20 H 0.077 0.923 21 C -0.011 4.011 22 N -0.920 5.920 23 Si 0.911 3.089 24 H -0.280 1.280 25 H -0.292 1.292 26 H -0.291 1.291 27 C 0.154 3.846 28 C -0.144 4.144 29 N -0.252 5.252 30 H 0.088 0.912 31 H 0.053 0.947 32 H 0.055 0.945 33 H 0.076 0.924 34 H 0.055 0.945 35 H 0.064 0.936 36 H 0.059 0.941 37 H 0.092 0.908 38 H 0.101 0.899 39 H 0.179 0.821 40 H 0.160 0.840 41 H 0.404 0.596 42 H 0.070 0.930 43 H 0.058 0.942 44 H 0.059 0.941 45 H 0.057 0.943 46 H 0.074 0.926 47 H 0.057 0.943 48 H 0.250 0.750 49 H 0.107 0.893 50 H 0.009 0.991 51 H 0.068 0.932 52 H 0.068 0.932 For the charges calculated by CM2: Dipole moment (debyes) X Y Z Total from point charges 16.320 6.845 12.339 21.575 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 -0.218 4.218 2 C -0.127 4.127 3 C -0.203 4.203 4 C 0.004 3.996 5 N -0.070 5.070 6 C -0.167 4.167 7 C -0.207 4.207 8 C -0.174 4.174 9 C 0.386 3.614 10 O -0.408 6.408 11 N -0.340 5.340 12 C 0.075 3.925 13 C -0.151 4.151 14 C -0.162 4.162 15 C -0.170 4.170 16 C 0.055 3.945 17 H 0.063 0.937 18 N -0.318 5.318 19 C -0.346 4.346 20 H 0.095 0.905 21 C -0.206 4.206 22 N -0.568 5.568 23 Si 0.742 3.258 24 H -0.206 1.206 25 H -0.219 1.219 26 H -0.218 1.218 27 C 0.030 3.970 28 C -0.183 4.183 29 N -0.088 5.088 30 H 0.107 0.893 31 H 0.072 0.928 32 H 0.074 0.926 33 H 0.095 0.905 34 H 0.075 0.925 35 H 0.083 0.917 36 H 0.078 0.922 37 H 0.111 0.889 38 H 0.119 0.881 39 H 0.196 0.804 40 H 0.178 0.822 41 H 0.239 0.761 42 H 0.089 0.911 43 H 0.077 0.923 44 H 0.077 0.923 45 H 0.076 0.924 46 H 0.093 0.907 47 H 0.076 0.924 48 H 0.061 0.939 49 H 0.125 0.875 50 H 0.027 0.973 51 H 0.087 0.913 52 H 0.086 0.914 Dipole moment (debyes) X Y Z Total from point charges 15.642 7.070 12.034 20.964 hybrid contribution -0.017 0.389 -0.398 0.557 sum 15.625 7.459 11.636 20.861 Atomic orbital electron populations 1.22109 0.93143 1.04950 1.01632 1.21409 0.98315 0.96242 0.96731 1.21787 1.00751 0.94911 1.02818 1.22186 1.01037 0.75589 1.00796 1.45551 1.03697 1.07473 1.50271 1.22822 0.97963 0.86878 1.09053 1.21754 0.91530 0.99563 1.07887 1.22168 0.95529 0.89904 1.09818 1.16846 0.81364 0.86546 0.76637 1.90764 1.85563 1.13347 1.51123 1.45762 1.05661 1.10460 1.72144 1.21675 0.84100 0.91019 0.95729 1.22287 0.96578 0.99632 0.96556 1.22359 0.95739 1.00102 0.98035 1.22940 0.98039 1.00189 0.95826 1.21749 0.90223 0.95240 0.87287 0.93746 1.44487 1.24159 1.63822 0.99340 1.19085 0.98108 1.27231 0.90188 0.90473 1.24770 0.98618 1.01115 0.96099 1.69818 1.35125 1.47383 1.04505 0.86039 0.81999 0.78461 0.79252 1.20572 1.21909 1.21815 1.22237 0.88734 0.92038 0.94026 1.23601 1.00960 0.98193 0.95563 1.73465 1.04350 1.12546 1.18486 0.89313 0.92775 0.92588 0.90508 0.92550 0.91653 0.92203 0.88939 0.88098 0.80430 0.82222 0.76118 0.91107 0.92289 0.92255 0.92403 0.90750 0.92399 0.93863 0.87501 0.97274 0.91309 0.91351 Number of geometries 1 Number of calculations of the screened coulomb radii 1 The total number of SCF iterations 15. 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 -0.16 -1.71 8.88 37.16 0.33 -1.38 16 2 C -0.11 -0.86 3.11 -90.62 -0.28 -1.14 16 3 C -0.14 -0.85 9.19 37.16 0.34 -0.50 16 4 C 0.12 0.86 5.88 -4.04 -0.02 0.84 16 5 N -0.28 -2.98 3.41 -61.33 -0.21 -3.19 16 6 C -0.02 -0.24 11.40 -17.17 -0.20 -0.44 16 7 C -0.18 -2.29 10.81 -39.36 -0.43 -2.71 16 8 C -0.01 -0.22 7.13 -82.76 -0.59 -0.81 16 9 C 0.60 10.77 6.99 -12.39 -0.09 10.69 16 10 O -0.53 -10.68 14.74 5.31 0.08 -10.61 16 11 N -0.69 -12.31 5.23 -46.33 -0.24 -12.55 16 12 C 0.16 3.07 0.73 -129.38 -0.09 2.97 16 13 C -0.11 -1.91 5.27 -25.79 -0.14 -2.05 16 14 C -0.12 -1.94 6.84 -25.17 -0.17 -2.11 16 15 C -0.13 -2.42 6.25 -24.87 -0.16 -2.57 16 16 C 0.16 3.38 3.63 -65.60 -0.24 3.14 16 17 H 0.05 0.92 7.99 -51.93 -0.41 0.50 16 18 N -0.59 -14.95 3.05 -160.13 -0.49 -15.44 16 19 C -0.22 -5.96 10.02 -15.06 -0.15 -6.11 16 20 H 0.08 2.05 7.83 -52.49 -0.41 1.63 16 21 C -0.01 -0.30 5.49 -17.43 -0.10 -0.39 16 22 N -0.92 -26.94 10.07 55.49 0.56 -26.39 16 23 Si 0.91 22.09 29.55 -169.99 -5.02 17.06 16 24 H -0.28 -6.58 7.11 56.52 0.40 -6.18 16 25 H -0.29 -7.15 7.11 56.52 0.40 -6.75 16 26 H -0.29 -7.11 7.11 56.52 0.40 -6.71 16 27 C 0.15 3.89 5.95 -1.72 -0.01 3.88 16 28 C -0.14 -3.07 5.85 -23.88 -0.14 -3.21 16 29 N -0.25 -3.47 8.66 33.42 0.29 -3.18 16 30 H 0.09 1.18 5.45 -51.93 -0.28 0.90 16 31 H 0.05 0.53 8.14 -51.93 -0.42 0.10 16 32 H 0.06 0.61 8.14 -51.93 -0.42 0.18 16 33 H 0.08 0.71 8.14 -51.93 -0.42 0.28 16 34 H 0.06 0.25 8.14 -51.93 -0.42 -0.17 16 35 H 0.06 0.41 8.14 -51.93 -0.42 -0.01 16 36 H 0.06 0.31 8.14 -51.93 -0.42 -0.11 16 37 H 0.09 0.58 8.14 -51.93 -0.42 0.16 16 38 H 0.10 0.40 8.04 -51.93 -0.42 -0.02 16 39 H 0.18 0.98 8.06 -52.49 -0.42 0.55 16 40 H 0.16 1.88 8.06 -52.49 -0.42 1.46 16 41 H 0.40 6.90 8.22 -40.82 -0.34 6.56 16 42 H 0.07 1.24 7.37 -51.93 -0.38 0.86 16 43 H 0.06 1.00 7.49 -51.92 -0.39 0.61 16 44 H 0.06 0.84 8.14 -51.93 -0.42 0.42 16 45 H 0.06 0.83 8.14 -51.93 -0.42 0.41 16 46 H 0.07 1.52 8.10 -51.93 -0.42 1.10 16 47 H 0.06 1.04 8.14 -51.93 -0.42 0.61 16 48 H 0.25 7.15 8.31 -40.82 -0.34 6.81 16 49 H 0.11 3.02 5.82 -51.93 -0.30 2.72 16 50 H 0.01 0.25 8.14 -51.93 -0.42 -0.17 16 51 H 0.07 1.50 6.64 -51.93 -0.35 1.15 16 52 H 0.07 1.44 7.63 -51.93 -0.40 1.04 16 LS Contribution 404.03 15.07 6.09 6.09 Total: -1.00 -32.37 404.03 -9.80 -42.17 By element: Atomic # 1 Polarization: 16.67 SS G_CDS: -8.73 Total: 7.94 kcal Atomic # 6 Polarization: 0.21 SS G_CDS: -2.12 Total: -1.91 kcal Atomic # 7 Polarization: -60.65 SS G_CDS: -0.09 Total: -60.74 kcal Atomic # 8 Polarization: -10.68 SS G_CDS: 0.08 Total: -10.61 kcal Atomic # 14 Polarization: 22.09 SS G_CDS: -5.02 Total: 17.06 kcal Total LS contribution 6.09 Total: 6.09 kcal Total: -32.37 -9.80 -42.17 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. ZINC000990891049.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 110.085 kcal (2) G-P(sol) polarization free energy of solvation -32.365 kcal (3) G-ENP(sol) elect.-nuc.-pol. free energy of system 77.720 kcal (4) G-CDS(sol) cavity-dispersion-solvent structure free energy -9.802 kcal (5) G-P-CDS(sol) = G-P(sol) + G-CDS(sol) = (2) + (4) -42.167 kcal (6) G-S(sol) free energy of system = (1) + (5) 67.918 kcal 1SCF WAS SPECIFIED, SO GEOMETRY OPTIMIZATION WAS NOT USED Total computer time = 1.24 seconds