loop_ _pdbx_reference_entity_poly_link.prd_id _pdbx_reference_entity_poly_link.ref_entity_id _pdbx_reference_entity_poly_link.component_id _pdbx_reference_entity_poly_link.link_id _pdbx_reference_entity_poly_link.entity_seq_num_1 _pdbx_reference_entity_poly_link.comp_id_1 _pdbx_reference_entity_poly_link.atom_id_1 _pdbx_reference_entity_poly_link.entity_seq_num_2 _pdbx_reference_entity_poly_link.comp_id_2 _pdbx_reference_entity_poly_link.atom_id_2 _pdbx_reference_entity_poly_link.value_order PRD_000001 1 1 1 1 DSN C 2 ALA N 'single' PRD_000001 1 1 2 2 ALA C 3 N2C N 'single' PRD_000001 1 1 3 2 ALA C 3 N2C N 'single' PRD_000001 1 1 4 2 ALA C 3 NCY N 'single' PRD_000001 1 1 5 3 N2C C 4 MVA N 'single' PRD_000001 1 1 6 3 NCY C 4 MVA N 'single' PRD_000001 1 1 7 4 MVA C 5 DSN OG 'single' PRD_000001 1 1 8 5 DSN C 6 ALA N 'single' PRD_000001 1 1 8 6 ALA C 7 NCY N 'single' PRD_000001 1 1 9 6 ALA C 7 N2C N 'single' PRD_000001 1 1 8 7 NCY C 8 MVA N 'single' PRD_000001 1 1 9 7 N2C C 8 MVZ N 'single' # ....