(4aR)-2c.8-dihydroxy-4ar.6ac-dimethyl-(4btH.11atH.11bcH)-2.3.4.4a.4b.5.6.6a.11.11a.11b.12-dodecahydro-1H-indeno[2.1-a]phenanthrene 、
乙酸酐 在
吡啶 作用下,
生成 (4a
R)-2
c.8-diacetoxy-4a
r.6a
c-dimethyl-(4b
tH.11a
tH.11b
cH)-2.3.4.4a.4b.5.6.6a.11.11a.11b.12-dodecahydro-1
H-indeno-[2.1-
a]phenanthrene