Ethyl ent-15α-[(2-nitro-benz-yloxy)meth-yl]-16-oxobeyeran-20-oate.
In the title compound, C(30)H(41)NO(6), the three six-membered rings adopt chair conformations and the stereochemistry of the A/B and B/C ring junctions are trans. The five-membered ring D adopts an envelope conformation, with the methyl-ene C atom as the flap. The title compound was synthesized via esterification, Tollens reaction, 1,5-hydride shift from the natural tetracyclic diterpenoid isosteviol.
Ya
Y
Wu
Xia
X
Wang
Jian-Hong
JH
Gong
Jing-Chao
JC
Tao