4549-02-4 Cyclo(L-pro-L-tyr) Maculosin Pyrrolo(1,2-a)pyrazine-1,4-dione, hexahydro-3-((4-hydroxyphenyl)methyl)-, (3S,8aS)- Pyrrolo(1,2-a)pyrazine-1,4-dione, hexahydro-3-((4-hydroxyphenyl)methyl)-, (3S-trans)-