153448-17-0 4-O-Butanoyl-4'-demethylpodophyllotoxin BN 58705 Butanoic acid, 5,5a,6,8a,9-hexahydro-9-(4-hydroxy-3,5-dimethoxyphenyl)-8-oxofuro(3',4':6,7)naphtho(2,3-d)-1,3-dioxol-5-yl ester, (5R-(5-alpha,5a-alpha,8a-beta,9-alpha))-