data_A1BY8 # _chem_comp.id A1BY8 _chem_comp.name "C16 alpha-bromoamide" _chem_comp.type non-polymer _chem_comp.pdbx_type HETAIN _chem_comp.formula "C27 H53 Br N3 O8 P" _chem_comp.mon_nstd_parent_comp_id ? _chem_comp.pdbx_synonyms ? _chem_comp.pdbx_formal_charge 0 _chem_comp.pdbx_initial_date 2025-03-05 _chem_comp.pdbx_modified_date 2025-08-08 _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 658.603 _chem_comp.one_letter_code ? _chem_comp.three_letter_code A1BY8 _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 9D2Y _chem_comp.pdbx_subcomponent_list ? _chem_comp.pdbx_processing_site RCSB _chem_comp.pdbx_pcm Y # 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.pdbx_n_terminal_atom_flag _chem_comp_atom.pdbx_backbone_atom_flag _chem_comp_atom.pdbx_c_terminal_atom_flag _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 A1BY8 C4 C1 C 0 1 N N N N N N 169.900 174.820 203.554 16.200 3.230 -0.160 C4 A1BY8 1 A1BY8 C14 C2 C 0 1 N N N N N N 172.941 183.797 208.250 4.530 -1.193 -0.698 C14 A1BY8 2 A1BY8 C5 C3 C 0 1 N N N N N N 169.630 175.986 202.610 15.189 2.290 0.499 C5 A1BY8 3 A1BY8 C6 C4 C 0 1 N N N N N N 170.276 177.314 202.986 13.866 2.345 -0.268 C6 A1BY8 4 A1BY8 C11 C5 C 0 1 N N N N N N 172.519 181.483 205.098 8.186 -0.364 0.176 C11 A1BY8 5 A1BY8 C7 C6 C 0 1 N N N N N N 169.701 178.519 202.251 12.855 1.405 0.391 C7 A1BY8 6 A1BY8 C8 C7 C 0 1 N N N N N N 170.635 179.713 202.094 11.532 1.461 -0.376 C8 A1BY8 7 A1BY8 C9 C8 C 0 1 N N N N N N 171.534 179.973 203.295 10.521 0.521 0.283 C9 A1BY8 8 A1BY8 C10 C9 C 0 1 N N N N N N 171.632 181.383 203.861 9.198 0.576 -0.483 C10 A1BY8 9 A1BY8 C12 C10 C 0 1 N N N N N N 172.250 182.648 206.044 6.864 -0.308 -0.591 C12 A1BY8 10 A1BY8 C13 C11 C 0 1 N N N N N N 172.880 182.513 207.427 5.852 -1.248 0.068 C13 A1BY8 11 A1BY8 N1 N1 N 0 1 N N N N N N 171.863 185.781 210.176 1.057 -1.893 0.021 N1 A1BY8 12 A1BY8 N2 N2 N 0 1 N N N N N N 170.509 187.565 210.589 -2.646 -1.524 -0.241 N2 A1BY8 13 A1BY8 C3 C12 C 0 1 N N N N N N 169.614 173.450 202.951 17.523 3.175 0.606 C3 A1BY8 14 A1BY8 N3 N3 N 0 1 N N N N N N 168.738 190.807 208.045 -7.509 -1.057 0.217 N3 A1BY8 15 A1BY8 C1 C13 C 0 1 N N N N N N 167.729 171.724 202.735 19.857 4.059 0.714 C1 A1BY8 16 A1BY8 C15 C14 C 0 1 N N S N N N 172.898 183.562 209.752 3.518 -2.133 -0.039 C15 A1BY8 17 A1BY8 C16 C15 C 0 1 N N N N N N 172.832 184.855 210.537 2.181 -1.987 -0.718 C16 A1BY8 18 A1BY8 C17 C16 C 0 1 N N N N N N 172.459 187.031 209.736 -0.243 -1.751 -0.639 C17 A1BY8 19 A1BY8 C18 C17 C 0 1 N N N N N N 171.910 187.892 210.788 -1.345 -1.666 0.419 C18 A1BY8 20 A1BY8 C19 C18 C 0 1 N N N N N N 169.715 188.643 210.540 -3.769 -1.430 0.497 C19 A1BY8 21 A1BY8 C2 C19 C 0 1 N N N N N N 168.537 172.630 203.648 18.534 4.115 -0.053 C2 A1BY8 22 A1BY8 C20 C20 C 0 1 N N N N N N 168.753 188.748 209.388 -5.107 -1.284 -0.181 C20 A1BY8 23 A1BY8 C21 C21 C 0 1 N N N N N N 169.532 189.682 208.514 -6.209 -1.199 0.877 C21 A1BY8 24 A1BY8 C22 C22 C 0 1 N N N N N N 168.501 190.956 206.754 -8.633 -0.963 0.956 C22 A1BY8 25 A1BY8 C23 C23 C 0 1 N N R N N N 167.069 191.339 206.351 -9.956 -0.701 0.284 C23 A1BY8 26 A1BY8 C24 C24 C 0 1 N N N N N N 166.441 190.911 204.983 -10.410 0.727 0.590 C24 A1BY8 27 A1BY8 C25 C25 C 0 1 N N N N N N 165.478 189.735 205.176 -10.706 0.859 2.085 C25 A1BY8 28 A1BY8 C26 C26 C 0 1 N N N N N N 167.447 190.436 203.931 -9.303 1.709 0.200 C26 A1BY8 29 A1BY8 C27 C27 C 0 1 N N N N N N 165.684 192.025 204.251 -11.675 1.043 -0.210 C27 A1BY8 30 A1BY8 O1 O1 O 0 1 N N N N N N 173.780 185.013 211.445 2.115 -1.955 -1.929 O1 A1BY8 31 A1BY8 O2 O2 O 0 1 N N N N N N 169.855 189.598 211.314 -3.704 -1.462 1.708 O2 A1BY8 32 A1BY8 O3 O3 O 0 1 N N N N N N 169.409 190.897 205.934 -8.579 -1.088 2.161 O3 A1BY8 33 A1BY8 O4 O4 O 0 1 N N N N N N 166.214 190.781 207.335 -9.814 -0.864 -1.129 O4 A1BY8 34 A1BY8 O5 O5 O 0 1 N N N N N N 165.002 193.098 204.977 -12.099 2.377 0.075 O5 A1BY8 35 A1BY8 O6 O6 O 0 1 N N N N N N 163.038 194.177 206.138 -13.298 2.963 -2.068 O6 A1BY8 36 A1BY8 O8 O7 O 0 1 N N N N N N 164.068 192.091 207.152 -14.720 2.259 -0.105 O8 A1BY8 37 A1BY8 P1 P1 P 0 1 N N N N N N 163.680 192.825 205.881 -13.403 3.045 -0.594 P1 A1BY8 38 A1BY8 H1 H1 H 0 1 N N N N N N 170.959 174.853 203.849 16.365 2.920 -1.192 H1 A1BY8 39 A1BY8 H2 H2 H 0 1 N N N N N N 169.267 174.944 204.445 15.813 4.249 -0.144 H2 A1BY8 40 A1BY8 H3 H3 H 0 1 N N N N N N 173.877 184.321 208.007 4.143 -0.174 -0.682 H3 A1BY8 41 A1BY8 H4 H4 H 0 1 N N N N N N 172.084 184.429 207.972 4.694 -1.503 -1.730 H4 A1BY8 42 A1BY8 H5 H5 H 0 1 N N N N N N 168.542 176.141 202.569 15.576 1.271 0.483 H5 A1BY8 43 A1BY8 H6 H6 H 0 1 N N N N N N 169.998 175.703 201.613 15.024 2.600 1.531 H6 A1BY8 44 A1BY8 H7 H7 H 0 1 N N N N N N 171.350 177.252 202.758 13.479 3.364 -0.252 H7 A1BY8 45 A1BY8 H8 H8 H 0 1 N N N N N N 170.138 177.471 204.066 14.031 2.036 -1.300 H8 A1BY8 46 A1BY8 H9 H9 H 0 1 N N N N N N 172.396 180.553 205.672 8.573 -1.383 0.160 H9 A1BY8 47 A1BY8 H10 H10 H 0 1 N N N N N N 173.561 181.567 204.755 8.022 -0.054 1.208 H10 A1BY8 48 A1BY8 H11 H11 H 0 1 N N N N N N 168.812 178.857 202.803 13.242 0.387 0.375 H11 A1BY8 49 A1BY8 H12 H12 H 0 1 N N N N N N 169.404 178.189 201.245 12.690 1.715 1.423 H12 A1BY8 50 A1BY8 H13 H13 H 0 1 N N N N N N 171.275 179.535 201.217 11.145 2.480 -0.359 H13 A1BY8 51 A1BY8 H14 H14 H 0 1 N N N N N N 170.021 180.610 201.924 11.697 1.151 -1.408 H14 A1BY8 52 A1BY8 H15 H15 H 0 1 N N N N N N 171.178 179.325 204.109 10.908 -0.498 0.267 H15 A1BY8 53 A1BY8 H16 H16 H 0 1 N N N N N N 172.552 179.672 203.005 10.356 0.831 1.316 H16 A1BY8 54 A1BY8 H17 H17 H 0 1 N N N N N N 172.044 182.042 203.083 9.363 0.266 -1.515 H17 A1BY8 55 A1BY8 H18 H18 H 0 1 N N N N N N 170.620 181.721 204.130 8.811 1.595 -0.467 H18 A1BY8 56 A1BY8 H19 H19 H 0 1 N N N N N N 172.642 183.564 205.578 6.477 0.711 -0.575 H19 A1BY8 57 A1BY8 H20 H20 H 0 1 N N N N N N 171.161 182.739 206.172 7.029 -0.618 -1.623 H20 A1BY8 58 A1BY8 H21 H21 H 0 1 N N N N N N 172.296 181.774 207.995 5.687 -0.939 1.100 H21 A1BY8 59 A1BY8 H22 H22 H 0 1 N N N N N N 173.908 182.145 207.296 6.239 -2.267 0.052 H22 A1BY8 60 A1BY8 H23 H23 H 0 1 N N N N N N 170.879 185.609 210.214 1.109 -1.919 0.989 H23 A1BY8 61 A1BY8 H24 H24 H 0 1 N N N N N N 170.171 186.628 210.498 -2.698 -1.498 -1.209 H24 A1BY8 62 A1BY8 H25 H25 H 0 1 N N N N N N 169.301 173.600 201.907 17.358 3.484 1.638 H25 A1BY8 63 A1BY8 H26 H26 H 0 1 N N N N N N 170.548 172.869 202.974 17.910 2.156 0.590 H26 A1BY8 64 A1BY8 H27 H27 H 0 1 N N N N N N 168.371 191.468 208.700 -7.562 -1.031 -0.751 H27 A1BY8 65 A1BY8 H28 H28 H 0 1 N N N N N N 166.981 171.177 203.328 20.244 3.040 0.698 H28 A1BY8 66 A1BY8 H29 H29 H 0 1 N N N N N N 167.219 172.332 201.973 20.578 4.729 0.244 H29 A1BY8 67 A1BY8 H30 H30 H 0 1 N N N N N N 168.402 171.007 202.242 19.692 4.369 1.746 H30 A1BY8 68 A1BY8 BR1 BR1 BR 0 0 N Y N N N N 171.919 183.091 209.923 4.141 -3.990 -0.211 BR1 A1BY8 69 A1BY8 H33 H33 H 0 1 N N N N N N 173.558 186.999 209.754 -0.248 -0.844 -1.243 H33 A1BY8 70 A1BY8 H34 H34 H 0 1 N N N N N N 172.117 187.327 208.733 -0.421 -2.615 -1.280 H34 A1BY8 71 A1BY8 H35 H35 H 0 1 N N N N N N 172.268 187.610 211.789 -1.167 -0.803 1.060 H35 A1BY8 72 A1BY8 H36 H36 H 0 1 N N N N N N 172.121 188.957 210.610 -1.341 -2.574 1.022 H36 A1BY8 73 A1BY8 H37 H37 H 0 1 N N N N N N 167.842 173.327 204.139 18.699 3.805 -1.085 H37 A1BY8 74 A1BY8 H38 H38 H 0 1 N N N N N N 169.025 172.002 204.408 18.148 5.134 -0.037 H38 A1BY8 75 A1BY8 H39 H39 H 0 1 N N N N N N 167.788 189.179 209.695 -5.111 -0.377 -0.785 H39 A1BY8 76 A1BY8 H40 H40 H 0 1 N N N N N N 168.583 187.775 208.903 -5.285 -2.148 -0.822 H40 A1BY8 77 A1BY8 H41 H41 H 0 1 N N N N N N 169.899 189.123 207.641 -6.031 -0.336 1.518 H41 A1BY8 78 A1BY8 H42 H42 H 0 1 N N N N N N 170.387 190.070 209.088 -6.205 -2.107 1.480 H42 A1BY8 79 A1BY8 H43 H43 H 0 1 N N N N N N 166.999 192.435 206.405 -10.699 -1.406 0.657 H43 A1BY8 80 A1BY8 H44 H44 H 0 1 N N N N N N 164.718 190.002 205.925 -9.786 0.711 2.651 H44 A1BY8 81 A1BY8 H45 H45 H 0 1 N N N N N N 164.985 189.504 204.220 -11.103 1.853 2.290 H45 A1BY8 82 A1BY8 H46 H46 H 0 1 N N N N N N 166.039 188.854 205.521 -11.438 0.108 2.378 H46 A1BY8 83 A1BY8 H47 H47 H 0 1 N N N N N N 168.058 189.622 204.349 -8.401 1.484 0.770 H47 A1BY8 84 A1BY8 H48 H48 H 0 1 N N N N N N 166.906 190.071 203.045 -9.092 1.614 -0.865 H48 A1BY8 85 A1BY8 H49 H49 H 0 1 N N N N N N 168.099 191.274 203.643 -9.626 2.726 0.418 H49 A1BY8 86 A1BY8 H50 H50 H 0 1 N N N N N N 164.916 191.528 203.641 -11.465 0.948 -1.276 H50 A1BY8 87 A1BY8 H51 H51 H 0 1 N N N N N N 166.416 192.514 203.591 -12.465 0.344 0.067 H51 A1BY8 88 A1BY8 H52 H52 H 0 1 N N N N N N 166.538 191.003 208.200 -9.167 -0.267 -1.530 H52 A1BY8 89 A1BY8 H54 H54 H 0 1 N N N N N N 163.836 192.619 207.907 -14.852 2.272 0.853 H54 A1BY8 90 A1BY8 H31 H31 H 0 1 N Y N N N N 173.789 182.994 210.057 3.420 -1.879 1.016 H31 A1BY8 91 A1BY8 O7 O8 O 0 1 N Y N N N N 162.616 191.835 205.186 -13.503 4.589 -0.148 O7 A1BY8 92 A1BY8 H32 H32 H 0 1 N N N N N N 161.789 192.289 205.070 -14.266 5.056 -0.515 H32 A1BY8 93 # 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 A1BY8 C8 C7 SING N N 1 A1BY8 C8 C9 SING N N 2 A1BY8 C7 C6 SING N N 3 A1BY8 C5 C6 SING N N 4 A1BY8 C5 C4 SING N N 5 A1BY8 C1 C2 SING N N 6 A1BY8 C3 C4 SING N N 7 A1BY8 C3 C2 SING N N 8 A1BY8 C9 C10 SING N N 9 A1BY8 C10 C11 SING N N 10 A1BY8 C26 C24 SING N N 11 A1BY8 C27 O5 SING N N 12 A1BY8 C27 C24 SING N N 13 A1BY8 O5 P1 SING N N 14 A1BY8 C24 C25 SING N N 15 A1BY8 C24 C23 SING N N 16 A1BY8 C11 C12 SING N N 17 A1BY8 P1 O6 DOUB N N 18 A1BY8 P1 O8 SING N N 19 A1BY8 O3 C22 DOUB N N 20 A1BY8 C12 C13 SING N N 21 A1BY8 C23 C22 SING N N 22 A1BY8 C23 O4 SING N N 23 A1BY8 C22 N3 SING N N 24 A1BY8 C13 C14 SING N N 25 A1BY8 N3 C21 SING N N 26 A1BY8 C14 C15 SING N N 27 A1BY8 C21 C20 SING N N 28 A1BY8 C20 C19 SING N N 29 A1BY8 C17 N1 SING N N 30 A1BY8 C17 C18 SING N N 31 A1BY8 C15 C16 SING N N 32 A1BY8 N1 C16 SING N N 33 A1BY8 C16 O1 DOUB N N 34 A1BY8 C19 N2 SING N N 35 A1BY8 C19 O2 DOUB N N 36 A1BY8 N2 C18 SING N N 37 A1BY8 C4 H1 SING N N 38 A1BY8 C4 H2 SING N N 39 A1BY8 C14 H3 SING N N 40 A1BY8 C14 H4 SING N N 41 A1BY8 C5 H5 SING N N 42 A1BY8 C5 H6 SING N N 43 A1BY8 C6 H7 SING N N 44 A1BY8 C6 H8 SING N N 45 A1BY8 C11 H9 SING N N 46 A1BY8 C11 H10 SING N N 47 A1BY8 C7 H11 SING N N 48 A1BY8 C7 H12 SING N N 49 A1BY8 C8 H13 SING N N 50 A1BY8 C8 H14 SING N N 51 A1BY8 C9 H15 SING N N 52 A1BY8 C9 H16 SING N N 53 A1BY8 C10 H17 SING N N 54 A1BY8 C10 H18 SING N N 55 A1BY8 C12 H19 SING N N 56 A1BY8 C12 H20 SING N N 57 A1BY8 C13 H21 SING N N 58 A1BY8 C13 H22 SING N N 59 A1BY8 N1 H23 SING N N 60 A1BY8 N2 H24 SING N N 61 A1BY8 C3 H25 SING N N 62 A1BY8 C3 H26 SING N N 63 A1BY8 N3 H27 SING N N 64 A1BY8 C1 H28 SING N N 65 A1BY8 C1 H29 SING N N 66 A1BY8 C1 H30 SING N N 67 A1BY8 C15 BR1 SING N N 68 A1BY8 C17 H33 SING N N 69 A1BY8 C17 H34 SING N N 70 A1BY8 C18 H35 SING N N 71 A1BY8 C18 H36 SING N N 72 A1BY8 C2 H37 SING N N 73 A1BY8 C2 H38 SING N N 74 A1BY8 C20 H39 SING N N 75 A1BY8 C20 H40 SING N N 76 A1BY8 C21 H41 SING N N 77 A1BY8 C21 H42 SING N N 78 A1BY8 C23 H43 SING N N 79 A1BY8 C25 H44 SING N N 80 A1BY8 C25 H45 SING N N 81 A1BY8 C25 H46 SING N N 82 A1BY8 C26 H47 SING N N 83 A1BY8 C26 H48 SING N N 84 A1BY8 C26 H49 SING N N 85 A1BY8 C27 H50 SING N N 86 A1BY8 C27 H51 SING N N 87 A1BY8 O4 H52 SING N N 88 A1BY8 O8 H54 SING N N 89 A1BY8 C15 H31 SING N N 90 A1BY8 P1 O7 SING N N 91 A1BY8 O7 H32 SING N N 92 # 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 A1BY8 SMILES ACDLabs 14.52 "O=P(O)(O)OCC(C)(C)C(O)C(=O)NCCC(=O)NCCNC(=O)C(Br)CCCCCCCCCCCCCC" A1BY8 InChI InChI 1.06 "InChI=1S/C27H53BrN3O8P/c1-4-5-6-7-8-9-10-11-12-13-14-15-16-22(28)25(34)31-20-19-29-23(32)17-18-30-26(35)24(33)27(2,3)21-39-40(36,37)38/h22,24,33H,4-21H2,1-3H3,(H,29,32)(H,30,35)(H,31,34)(H2,36,37,38)/t22-,24-/m0/s1" A1BY8 InChIKey InChI 1.06 WRZPJKRMVZRMQR-UPVQGACJSA-N A1BY8 SMILES_CANONICAL CACTVS 3.385 "CCCCCCCCCCCCCC[C@H](Br)C(=O)NCCNC(=O)CCNC(=O)[C@H](O)C(C)(C)CO[P](O)(O)=O" A1BY8 SMILES CACTVS 3.385 "CCCCCCCCCCCCCC[CH](Br)C(=O)NCCNC(=O)CCNC(=O)[CH](O)C(C)(C)CO[P](O)(O)=O" A1BY8 SMILES_CANONICAL "OpenEye OEToolkits" 3.1.0.0 "CCCCCCCCCCCCCC[C@@H](C(=O)NCCNC(=O)CCNC(=O)[C@@H](C(C)(C)COP(=O)(O)O)O)Br" A1BY8 SMILES "OpenEye OEToolkits" 3.1.0.0 "CCCCCCCCCCCCCCC(C(=O)NCCNC(=O)CCNC(=O)C(C(C)(C)COP(=O)(O)O)O)Br" # 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 A1BY8 "SYSTEMATIC NAME" ACDLabs 14.52 "N-{2-[(2S)-2-bromohexadecanamido]ethyl}-N~3~-[(2R)-2-hydroxy-3,3-dimethyl-4-(phosphonooxy)butanoyl]-beta-alaninamide" A1BY8 "SYSTEMATIC NAME" "OpenEye OEToolkits" 3.1.0.0 "[(3~{R})-4-[[3-[2-[[(2~{S})-2-bromanylhexadecanoyl]amino]ethylamino]-3-oxidanylidene-propyl]amino]-2,2-dimethyl-3-oxidanyl-4-oxidanylidene-butyl] dihydrogen phosphate" # loop_ _pdbx_chem_comp_pcm.pcm_id _pdbx_chem_comp_pcm.comp_id _pdbx_chem_comp_pcm.modified_residue_id _pdbx_chem_comp_pcm.type _pdbx_chem_comp_pcm.category _pdbx_chem_comp_pcm.position _pdbx_chem_comp_pcm.polypeptide_position _pdbx_chem_comp_pcm.comp_id_linking_atom _pdbx_chem_comp_pcm.modified_residue_id_linking_atom _pdbx_chem_comp_pcm.uniprot_specific_ptm_accession _pdbx_chem_comp_pcm.uniprot_generic_ptm_accession 1 A1BY8 CYS None "Covalent chemical modification" "Amino-acid side chain" "Any position" C15 SG ? ? 2 A1BY8 SER None "Covalent chemical modification" "Amino-acid side chain" "Any position" P1 OG ? ? # loop_ _pdbx_chem_comp_audit.comp_id _pdbx_chem_comp_audit.action_type _pdbx_chem_comp_audit.date _pdbx_chem_comp_audit.processing_site A1BY8 "Create component" 2025-03-05 RCSB A1BY8 "Modify PCM" 2025-03-05 RCSB A1BY8 "Other modification" 2025-03-05 RCSB A1BY8 "Initial release" 2025-08-13 RCSB #