91776-48-6 Fibrostatin B L-CYSTEINE, N-ACETYL-S-((5,8-DIHYDRO-1-HYDROXY-3,6-DIMETHOXY-7-METHYL-5,8-DIOXO- L-Cysteine, N-acetyl-S-((5,8-dihydro-1-hydroxy-3,6-dimethoxy-7-methyl-5,8-dioxo-2-naphthalenyl)methyl)-