loop_ _pdbx_reference_entity_list.prd_id _pdbx_reference_entity_list.ref_entity_id _pdbx_reference_entity_list.component_id _pdbx_reference_entity_list.type _pdbx_reference_entity_list.details PRD_000001 1 1 'polymer' "PEPTIDE LIKE SEQUENCE RESIDUES 1 TO 8" PRD_000001 2 2 'non-polymer' "QUINALDIC ACID CHROMOPHORE" PRD_000001 3 3 'non-polymer' "QUINALDIC ACID CHROMOPHORE"