loop_ _pdbx_chem_comp_feature.comp_id _pdbx_chem_comp_feature.type _pdbx_chem_comp_feature.value _pdbx_chem_comp_feature.source 00X 'ENZYME INHIBITED' 'ASPARTIC PROTEINASE' PDB 00X 'FUNCTION' 'Transistion-state analogue inhibitor' PDB 00X 'STRUCTURE IMAGE URL' 'http://journals.iucr.org/00X.jpg' IUCR