# loop_ _pdbx_entity_group_list.entity_group_id _pdbx_entity_group_list.name _pdbx_entity_group_list.description 1 "TRIOSTIN" ; TRIOSTIN IS A IS A BICYCLIC OCTADEPSIPEPTIDE. BICYCLIZATION IS ACHIEVED BY LINKING THE N- AND THE C- TERMINI, AND A DISULPHIDE BOND BETWEEN RESIDUES 3 AND 7. THE TWO QUINOXALINE CHROMOPHORES ARE LINKED TO THE D-SERINE RESIDUES, RESIDUES 1 AND 5. ;