Synonyms: Pyrrolo[1,2-a]pyrazine-1,4-dione,hexahydro-3-(p-hydroxybenzyl)- (8CI); Pyrrolo[1,2-a]pyrazine-1,4-dione,hexahydro-3-[(4-hydroxyphenyl)methyl]-, (3S-trans)-; Cyclo(L-Pro-L-Tyr);Cyclo(L-prolinyl-L-tyrosine); Cyclo(L-tyrosyl-L-proline); L-Proline-L-tyrosineanhydride; Maculosin; Maculosin 1; Maculosine; Maculosine 1