91776-42-0 Fibrostatin A L-CYSTEINE, N-ACETYL-S-((5,8-DIHYDRO-1-HYDROXY-3-METHOXY-7-METHYL-5,8-DIOXO-2-NA L-Cysteine, N-acetyl-S-((5,8-dihydro-1-hydroxy-3-methoxy-7-methyl-5,8-dioxo-2-naphthalenyl)methyl)-