91776-44-2 Fibrostatin E L-CYSTEINE, N-ACETYL-S-((5,8-DIHYDRO-1-HYDROXY-7-(HYDROXYMETHYL)-3-METHOXY-5,8-D L-Cysteine, N-acetyl-S-((5,8-dihydro-1-hydroxy-7-(hydroxymethyl)-3-methoxy-5,8-dioxo-2-naphthalenyl)methyl)-