data_2KQ # _chem_comp.id 2KQ _chem_comp.name ; (3S)-3-[2-[3-[[(2R)-4-[[[(2R,3S,4R,5R)-5-(6-aminopurin-9-yl)-4-oxidanyl-3-phosphonooxy-oxolan-2-yl]methoxy-oxidanyl-phosphoryl]oxy-oxidanyl-phosphoryl]oxy-3,3-dimethyl-2-oxidanyl-butanoyl]amino]propanoylamino]ethylsulfanyl]-3-oxidanyl-butanoic acid ; _chem_comp.type NON-POLYMER _chem_comp.pdbx_type HETAIN _chem_comp.formula "C25 H42 N7 O19 P3 S" _chem_comp.mon_nstd_parent_comp_id ? _chem_comp.pdbx_synonyms ? _chem_comp.pdbx_formal_charge 0 _chem_comp.pdbx_initial_date 2013-11-20 _chem_comp.pdbx_modified_date 2014-03-14 _chem_comp.pdbx_ambiguous_flag N _chem_comp.pdbx_release_status REL _chem_comp.pdbx_replaced_by ? _chem_comp.pdbx_replaces ? _chem_comp.formula_weight 869.623 _chem_comp.one_letter_code ? _chem_comp.three_letter_code 2KQ _chem_comp.pdbx_model_coordinates_details ? _chem_comp.pdbx_model_coordinates_missing_flag N _chem_comp.pdbx_ideal_coordinates_details Corina _chem_comp.pdbx_ideal_coordinates_missing_flag N _chem_comp.pdbx_model_coordinates_db_code 4NNC _chem_comp.pdbx_subcomponent_list ? _chem_comp.pdbx_processing_site RCSB # # loop_ _chem_comp_atom.comp_id _chem_comp_atom.atom_id _chem_comp_atom.alt_atom_id _chem_comp_atom.type_symbol _chem_comp_atom.charge _chem_comp_atom.pdbx_align _chem_comp_atom.pdbx_aromatic_flag _chem_comp_atom.pdbx_leaving_atom_flag _chem_comp_atom.pdbx_stereo_config _chem_comp_atom.model_Cartn_x _chem_comp_atom.model_Cartn_y _chem_comp_atom.model_Cartn_z _chem_comp_atom.pdbx_model_Cartn_x_ideal _chem_comp_atom.pdbx_model_Cartn_y_ideal _chem_comp_atom.pdbx_model_Cartn_z_ideal _chem_comp_atom.pdbx_component_atom_id _chem_comp_atom.pdbx_component_comp_id _chem_comp_atom.pdbx_ordinal 2KQ C01 C01 C 0 1 N N N -46.690 -13.705 -12.408 2.120 2.783 -3.140 C01 2KQ 1 2KQ C02 C02 C 0 1 N N N -48.059 -13.332 -12.998 1.861 4.258 -2.823 C02 2KQ 2 2KQ C03 C03 C 0 1 N N N -49.210 -14.230 -12.323 0.718 4.774 -3.700 C03 2KQ 3 2KQ C04 C04 C 0 1 N N N -48.300 -11.840 -12.735 1.477 4.403 -1.349 C04 2KQ 4 2KQ O05 O05 O 0 1 N N N -49.547 -11.491 -13.291 0.295 3.644 -1.087 O05 2KQ 5 2KQ P06 P06 P 0 1 N N N -49.840 -9.992 -13.746 -0.394 3.568 0.366 P06 2KQ 6 2KQ O07 O07 O 0 1 N N N -51.343 -9.774 -13.745 0.603 3.116 1.362 O07 2KQ 7 2KQ O08 O08 O 0 1 N N N -49.205 -9.003 -12.783 -0.941 5.025 0.777 O08 2KQ 8 2KQ O09 O09 O 0 1 N N N -49.281 -9.805 -15.224 -1.621 2.527 0.324 O09 2KQ 9 2KQ P10 P10 P 0 1 N N N -47.814 -9.329 -15.670 -2.494 1.781 1.453 P10 2KQ 10 2KQ O11 O11 O 0 1 N N N -47.608 -9.613 -17.132 -2.871 2.750 2.506 O11 2KQ 11 2KQ O12 O12 O 0 1 N N N -46.779 -10.102 -14.888 -1.625 0.592 2.104 O12 2KQ 12 2KQ O13 O13 O 0 1 N N N -47.635 -7.757 -15.395 -3.825 1.169 0.785 O13 2KQ 13 2KQ C14 C14 C 0 1 N N N -46.358 -7.137 -15.616 -4.856 0.536 1.544 C14 2KQ 14 2KQ C15 C15 C 0 1 N N R -46.497 -5.675 -15.659 -5.970 0.071 0.604 C15 2KQ 15 2KQ O16 O16 O 0 1 N N N -47.615 -5.266 -16.547 -5.513 -1.029 -0.212 O16 2KQ 16 2KQ C17 C17 C 0 1 N N R -48.600 -4.606 -15.739 -6.713 -1.690 -0.668 C17 2KQ 17 2KQ N18 N18 N 0 1 Y N N -49.881 -5.063 -16.154 -6.414 -3.064 -1.080 N18 2KQ 18 2KQ C19 C19 C 0 1 Y N N -50.481 -6.223 -15.832 -5.358 -3.819 -0.664 C19 2KQ 19 2KQ N20 N20 N 0 1 Y N N -51.684 -6.287 -16.446 -5.399 -4.990 -1.229 N20 2KQ 20 2KQ C21 C21 C 0 1 Y N N -51.858 -5.154 -17.177 -6.482 -5.062 -2.040 C21 2KQ 21 2KQ C22 C22 C 0 1 Y N N -52.884 -4.660 -18.007 -7.026 -6.050 -2.878 C22 2KQ 22 2KQ N23 N23 N 0 1 N N N -54.099 -5.431 -18.235 -6.413 -7.285 -3.006 N23 2KQ 23 2KQ N24 N24 N 0 1 Y N N -52.721 -3.460 -18.593 -8.142 -5.773 -3.543 N24 2KQ 24 2KQ C25 C25 C 0 1 Y N N -51.586 -2.744 -18.397 -8.733 -4.598 -3.427 C25 2KQ 25 2KQ N26 N26 N 0 1 Y N N -50.594 -3.179 -17.606 -8.260 -3.642 -2.655 N26 2KQ 26 2KQ C27 C27 C 0 1 Y N N -50.716 -4.385 -16.992 -7.149 -3.828 -1.950 C27 2KQ 27 2KQ C28 C28 C 0 1 N N R -48.283 -4.912 -14.333 -7.653 -1.689 0.558 C28 2KQ 28 2KQ O29 O29 O 0 1 N N N -48.622 -3.826 -13.470 -9.007 -1.477 0.152 O29 2KQ 29 2KQ C30 C30 C 0 1 N N S -46.823 -5.099 -14.318 -7.153 -0.504 1.414 C30 2KQ 30 2KQ O31 O31 O 0 1 N N N -46.174 -3.820 -14.156 -8.182 0.477 1.562 O31 2KQ 31 2KQ P32 P32 P 0 1 N N N -44.540 -3.706 -14.241 -8.687 1.009 2.995 P32 2KQ 32 2KQ O33 O33 O 0 1 N N N -44.036 -4.040 -15.653 -7.531 1.519 3.766 O33 2KQ 33 2KQ O34 O34 O 0 1 N N N -44.094 -2.309 -13.858 -9.755 2.195 2.781 O34 2KQ 34 2KQ O35 O35 O 0 1 N N N -43.948 -4.689 -13.266 -9.380 -0.199 3.803 O35 2KQ 35 2KQ C36 C36 C 0 1 N N R -47.999 -13.485 -14.553 3.126 5.070 -3.104 C36 2KQ 36 2KQ O37 O37 O 0 1 N N N -47.021 -12.662 -15.033 2.843 6.462 -2.949 O37 2KQ 37 2KQ C38 C38 C 0 1 N N N -47.709 -14.907 -15.062 4.207 4.667 -2.134 C38 2KQ 38 2KQ O39 O39 O 0 1 N N N -46.605 -15.433 -14.966 4.572 5.442 -1.275 O39 2KQ 39 2KQ N40 N40 N 0 1 N N N -48.783 -15.631 -15.727 4.769 3.445 -2.221 N40 2KQ 40 2KQ C41 C41 C 0 1 N N N -48.474 -16.931 -16.223 5.749 3.016 -1.220 C41 2KQ 41 2KQ C42 C42 C 0 1 N N N -48.832 -18.002 -15.199 6.227 1.600 -1.548 C42 2KQ 42 2KQ C43 C43 C 0 1 N N N -48.551 -19.445 -15.675 7.236 1.160 -0.519 C43 2KQ 43 2KQ O44 O44 O 0 1 N N N -47.453 -19.771 -16.131 7.542 1.905 0.388 O44 2KQ 44 2KQ N45 N45 N 0 1 N N N -49.620 -20.402 -15.596 7.798 -0.062 -0.606 N45 2KQ 45 2KQ C46 C46 C 0 1 N N N -49.337 -21.732 -16.047 8.778 -0.491 0.394 C46 2KQ 46 2KQ C47 C47 C 0 1 N N N -49.690 -22.735 -14.971 9.256 -1.907 0.066 C47 2KQ 47 2KQ S48 S48 S 0 1 N N N -49.693 -24.407 -15.600 10.470 -2.437 1.305 S48 2KQ 48 2KQ C49 C49 C 0 1 N N S -50.365 -25.497 -14.362 10.911 -4.109 0.755 C49 2KQ 49 2KQ C50 C50 C 0 1 N N N -51.653 -25.896 -14.858 11.614 -4.030 -0.602 C50 2KQ 50 2KQ O51 O51 O 0 1 N N N -50.572 -24.818 -13.140 9.726 -4.898 0.633 O51 2KQ 51 2KQ C52 C52 C 0 1 N N N -49.517 -26.801 -14.242 11.849 -4.752 1.779 C52 2KQ 52 2KQ C53 C53 C 0 1 N N N -49.265 -27.377 -12.882 13.087 -3.906 1.927 C53 2KQ 53 2KQ O54 O54 O 0 1 N N N -49.691 -26.805 -11.835 14.119 -4.349 2.662 O54 2KQ 54 2KQ O55 O55 O 0 1 N N N -48.620 -28.456 -12.803 13.152 -2.829 1.383 O55 2KQ 55 2KQ H1 H1 H 0 1 N N N -46.721 -13.601 -11.313 1.193 2.220 -3.031 H1 2KQ 56 2KQ H2 H2 H 0 1 N N N -46.449 -14.746 -12.670 2.484 2.690 -4.163 H2 2KQ 57 2KQ H3 H3 H 0 1 N N N -45.919 -13.036 -12.818 2.868 2.390 -2.451 H3 2KQ 58 2KQ H4 H4 H 0 1 N N N -49.202 -14.079 -11.233 0.579 5.841 -3.525 H4 2KQ 59 2KQ H5 H5 H 0 1 N N N -50.190 -13.934 -12.726 0.962 4.608 -4.750 H5 2KQ 60 2KQ H6 H6 H 0 1 N N N -49.026 -15.291 -12.548 -0.200 4.242 -3.452 H6 2KQ 61 2KQ H7 H7 H 0 1 N N N -47.503 -11.245 -13.205 2.291 4.035 -0.724 H7 2KQ 62 2KQ H8 H8 H 0 1 N N N -48.309 -11.649 -11.652 1.293 5.453 -1.124 H8 2KQ 63 2KQ H9 H9 H 0 1 N N N -49.882 -8.464 -12.390 -1.600 5.385 0.168 H9 2KQ 64 2KQ H10 H10 H 0 1 N N N -46.230 -10.593 -15.488 -1.342 -0.082 1.470 H10 2KQ 65 2KQ H11 H11 H 0 1 N N N -45.945 -7.490 -16.573 -4.444 -0.324 2.072 H11 2KQ 66 2KQ H12 H12 H 0 1 N N N -45.676 -7.412 -14.798 -5.262 1.244 2.266 H12 2KQ 67 2KQ H13 H13 H 0 1 N N N -45.561 -5.228 -16.025 -6.306 0.897 -0.023 H13 2KQ 68 2KQ H14 H14 H 0 1 N N N -48.529 -3.519 -15.891 -7.163 -1.135 -1.491 H14 2KQ 69 2KQ H15 H15 H 0 1 N N N -50.067 -6.983 -15.185 -4.598 -3.492 0.031 H15 2KQ 70 2KQ H16 H16 H 0 1 N N N -54.705 -4.925 -18.849 -5.599 -7.476 -2.514 H16 2KQ 71 2KQ H17 H17 H 0 1 N N N -53.863 -6.310 -18.649 -6.798 -7.959 -3.587 H17 2KQ 72 2KQ H18 H18 H 0 1 N N N -51.477 -1.792 -18.895 -9.639 -4.414 -3.986 H18 2KQ 73 2KQ H19 H19 H 0 1 N N N -48.790 -5.837 -14.020 -7.562 -2.624 1.111 H19 2KQ 74 2KQ H20 H20 H 0 1 N N N -48.406 -4.054 -12.573 -9.352 -2.162 -0.438 H20 2KQ 75 2KQ H21 H21 H 0 1 N N N -46.529 -5.797 -13.520 -6.814 -0.853 2.389 H21 2KQ 76 2KQ H22 H22 H 0 1 N N N -43.595 -1.929 -14.571 -10.102 2.565 3.605 H22 2KQ 77 2KQ H23 H23 H 0 1 N N N -43.392 -5.302 -13.732 -10.146 -0.582 3.355 H23 2KQ 78 2KQ H24 H24 H 0 1 N N N -48.978 -13.180 -14.952 3.463 4.879 -4.123 H24 2KQ 79 2KQ H25 H25 H 0 1 N N N -46.272 -13.182 -15.301 2.538 6.706 -2.064 H25 2KQ 80 2KQ H26 H26 H 0 1 N N N -49.695 -15.235 -15.831 4.524 2.849 -2.946 H26 2KQ 81 2KQ H27 H27 H 0 1 N N N -49.045 -17.110 -17.146 6.600 3.698 -1.230 H27 2KQ 82 2KQ H28 H28 H 0 1 N N N -47.397 -16.987 -16.441 5.288 3.024 -0.233 H28 2KQ 83 2KQ H29 H29 H 0 1 N N N -48.246 -17.818 -14.287 5.377 0.918 -1.539 H29 2KQ 84 2KQ H30 H30 H 0 1 N N N -49.904 -17.916 -14.969 6.689 1.592 -2.536 H30 2KQ 85 2KQ H31 H31 H 0 1 N N N -50.521 -20.151 -15.242 7.553 -0.658 -1.331 H31 2KQ 86 2KQ H32 H32 H 0 1 N N N -49.930 -21.943 -16.949 9.629 0.191 0.385 H32 2KQ 87 2KQ H33 H33 H 0 1 N N N -48.266 -21.815 -16.284 8.317 -0.483 1.382 H33 2KQ 88 2KQ H34 H34 H 0 1 N N N -48.952 -22.661 -14.159 8.406 -2.589 0.075 H34 2KQ 89 2KQ H35 H35 H 0 1 N N N -50.691 -22.500 -14.579 9.718 -1.915 -0.921 H35 2KQ 90 2KQ H36 H36 H 0 1 N N N -52.129 -26.576 -14.137 12.543 -3.469 -0.498 H36 2KQ 91 2KQ H37 H37 H 0 1 N N N -52.285 -25.006 -14.995 11.835 -5.038 -0.955 H37 2KQ 92 2KQ H38 H38 H 0 1 N N N -51.531 -26.411 -15.822 10.965 -3.529 -1.319 H38 2KQ 93 2KQ H39 H39 H 0 1 N N N -50.930 -25.421 -12.499 9.229 -4.991 1.457 H39 2KQ 94 2KQ H40 H40 H 0 1 N N N -50.030 -27.575 -14.831 11.342 -4.825 2.741 H40 2KQ 95 2KQ H41 H41 H 0 1 N N N -48.535 -26.590 -14.691 12.128 -5.749 1.439 H41 2KQ 96 2KQ H42 H42 H 0 1 N N N -49.443 -27.314 -11.072 14.892 -3.772 2.728 H42 2KQ 97 # # loop_ _chem_comp_bond.comp_id _chem_comp_bond.atom_id_1 _chem_comp_bond.atom_id_2 _chem_comp_bond.value_order _chem_comp_bond.pdbx_aromatic_flag _chem_comp_bond.pdbx_stereo_config _chem_comp_bond.pdbx_ordinal 2KQ N24 C25 DOUB Y N 1 2KQ N24 C22 SING Y N 2 2KQ C25 N26 SING Y N 3 2KQ N23 C22 SING N N 4 2KQ C22 C21 DOUB Y N 5 2KQ N26 C27 DOUB Y N 6 2KQ C21 C27 SING Y N 7 2KQ C21 N20 SING Y N 8 2KQ O11 P10 DOUB N N 9 2KQ C27 N18 SING Y N 10 2KQ O16 C17 SING N N 11 2KQ O16 C15 SING N N 12 2KQ N20 C19 DOUB Y N 13 2KQ C41 N40 SING N N 14 2KQ C41 C42 SING N N 15 2KQ N18 C19 SING Y N 16 2KQ N18 C17 SING N N 17 2KQ O44 C43 DOUB N N 18 2KQ C46 N45 SING N N 19 2KQ C46 C47 SING N N 20 2KQ C17 C28 SING N N 21 2KQ N40 C38 SING N N 22 2KQ C43 N45 SING N N 23 2KQ C43 C42 SING N N 24 2KQ P10 O13 SING N N 25 2KQ P10 O09 SING N N 26 2KQ P10 O12 SING N N 27 2KQ C15 C14 SING N N 28 2KQ C15 C30 SING N N 29 2KQ O33 P32 DOUB N N 30 2KQ C14 O13 SING N N 31 2KQ S48 C47 SING N N 32 2KQ S48 C49 SING N N 33 2KQ O09 P06 SING N N 34 2KQ C38 O39 DOUB N N 35 2KQ C38 C36 SING N N 36 2KQ O37 C36 SING N N 37 2KQ C50 C49 SING N N 38 2KQ C36 C02 SING N N 39 2KQ C49 C52 SING N N 40 2KQ C49 O51 SING N N 41 2KQ C28 C30 SING N N 42 2KQ C28 O29 SING N N 43 2KQ C30 O31 SING N N 44 2KQ C52 C53 SING N N 45 2KQ P32 O31 SING N N 46 2KQ P32 O34 SING N N 47 2KQ P32 O35 SING N N 48 2KQ P06 O07 DOUB N N 49 2KQ P06 O05 SING N N 50 2KQ P06 O08 SING N N 51 2KQ O05 C04 SING N N 52 2KQ C02 C04 SING N N 53 2KQ C02 C01 SING N N 54 2KQ C02 C03 SING N N 55 2KQ C53 O55 DOUB N N 56 2KQ C53 O54 SING N N 57 2KQ C01 H1 SING N N 58 2KQ C01 H2 SING N N 59 2KQ C01 H3 SING N N 60 2KQ C03 H4 SING N N 61 2KQ C03 H5 SING N N 62 2KQ C03 H6 SING N N 63 2KQ C04 H7 SING N N 64 2KQ C04 H8 SING N N 65 2KQ O08 H9 SING N N 66 2KQ O12 H10 SING N N 67 2KQ C14 H11 SING N N 68 2KQ C14 H12 SING N N 69 2KQ C15 H13 SING N N 70 2KQ C17 H14 SING N N 71 2KQ C19 H15 SING N N 72 2KQ N23 H16 SING N N 73 2KQ N23 H17 SING N N 74 2KQ C25 H18 SING N N 75 2KQ C28 H19 SING N N 76 2KQ O29 H20 SING N N 77 2KQ C30 H21 SING N N 78 2KQ O34 H22 SING N N 79 2KQ O35 H23 SING N N 80 2KQ C36 H24 SING N N 81 2KQ O37 H25 SING N N 82 2KQ N40 H26 SING N N 83 2KQ C41 H27 SING N N 84 2KQ C41 H28 SING N N 85 2KQ C42 H29 SING N N 86 2KQ C42 H30 SING N N 87 2KQ N45 H31 SING N N 88 2KQ C46 H32 SING N N 89 2KQ C46 H33 SING N N 90 2KQ C47 H34 SING N N 91 2KQ C47 H35 SING N N 92 2KQ C50 H36 SING N N 93 2KQ C50 H37 SING N N 94 2KQ C50 H38 SING N N 95 2KQ O51 H39 SING N N 96 2KQ C52 H40 SING N N 97 2KQ C52 H41 SING N N 98 2KQ O54 H42 SING N N 99 # # loop_ _pdbx_chem_comp_descriptor.comp_id _pdbx_chem_comp_descriptor.type _pdbx_chem_comp_descriptor.program _pdbx_chem_comp_descriptor.program_version _pdbx_chem_comp_descriptor.descriptor 2KQ SMILES ACDLabs 12.01 "O=C(O)CC(O)(SCCNC(=O)CCNC(=O)C(O)C(C)(C)COP(=O)(O)OP(=O)(O)OCC3OC(n2cnc1c(ncnc12)N)C(O)C3OP(=O)(O)O)C" 2KQ InChI InChI 1.03 "InChI=1S/C25H42N7O19P3S/c1-24(2,19(37)22(38)28-5-4-14(33)27-6-7-55-25(3,39)8-15(34)35)10-48-54(45,46)51-53(43,44)47-9-13-18(50-52(40,41)42)17(36)23(49-13)32-12-31-16-20(26)29-11-30-21(16)32/h11-13,17-19,23,36-37,39H,4-10H2,1-3H3,(H,27,33)(H,28,38)(H,34,35)(H,43,44)(H,45,46)(H2,26,29,30)(H2,40,41,42)/t13-,17-,18-,19+,23-,25+/m1/s1" 2KQ InChIKey InChI 1.03 FIZPFHAKAOWUQH-RCVSXOLZSA-N 2KQ SMILES_CANONICAL CACTVS 3.385 "CC(C)(CO[P](O)(=O)O[P](O)(=O)OC[C@H]1O[C@H]([C@H](O)[C@@H]1O[P](O)(O)=O)n2cnc3c(N)ncnc23)[C@@H](O)C(=O)NCCC(=O)NCCS[C@](C)(O)CC(O)=O" 2KQ SMILES CACTVS 3.385 "CC(C)(CO[P](O)(=O)O[P](O)(=O)OC[CH]1O[CH]([CH](O)[CH]1O[P](O)(O)=O)n2cnc3c(N)ncnc23)[CH](O)C(=O)NCCC(=O)NCCS[C](C)(O)CC(O)=O" 2KQ SMILES_CANONICAL "OpenEye OEToolkits" 1.7.6 "C[C@](CC(=O)O)(O)SCCNC(=O)CCNC(=O)[C@@H](C(C)(C)COP(=O)(O)OP(=O)(O)OC[C@@H]1[C@H]([C@H]([C@@H](O1)n2cnc3c2ncnc3N)O)OP(=O)(O)O)O" 2KQ SMILES "OpenEye OEToolkits" 1.7.6 "CC(C)(COP(=O)(O)OP(=O)(O)OCC1C(C(C(O1)n2cnc3c2ncnc3N)O)OP(=O)(O)O)C(C(=O)NCCC(=O)NCCSC(C)(CC(=O)O)O)O" # # loop_ _pdbx_chem_comp_identifier.comp_id _pdbx_chem_comp_identifier.type _pdbx_chem_comp_identifier.program _pdbx_chem_comp_identifier.program_version _pdbx_chem_comp_identifier.identifier 2KQ "SYSTEMATIC NAME" ACDLabs 12.01 "(3R,5R,9R,19S)-1-[(2R,3S,4R,5R)-5-(6-amino-9H-purin-9-yl)-4-hydroxy-3-(phosphonooxy)tetrahydrofuran-2-yl]-3,5,9,19-tetrahydroxy-8,8,19-trimethyl-10,14-dioxo-2,4,6-trioxa-18-thia-11,15-diaza-3,5-diphosphahenicosan-21-oic acid 3,5-dioxide (non-preferred name)" 2KQ "SYSTEMATIC NAME" "OpenEye OEToolkits" 1.7.6 "(3S)-3-[2-[3-[[(2R)-4-[[[(2R,3S,4R,5R)-5-(6-aminopurin-9-yl)-4-oxidanyl-3-phosphonooxy-oxolan-2-yl]methoxy-oxidanyl-phosphoryl]oxy-oxidanyl-phosphoryl]oxy-3,3-dimethyl-2-oxidanyl-butanoyl]amino]propanoylamino]ethylsulfanyl]-3-oxidanyl-butanoic acid" # # loop_ _pdbx_chem_comp_audit.comp_id _pdbx_chem_comp_audit.action_type _pdbx_chem_comp_audit.date _pdbx_chem_comp_audit.processing_site 2KQ "Create component" 2013-11-20 RCSB 2KQ "Initial release" 2014-03-19 RCSB ##