A hexacyclic ent-trachylobane diterpenoid possessing an oxetane ring from Mitrephora glabra

Chen Li, Dongho Lee, Tyler N. Graf, Sharnelle S. Phifer, Yuka Nakanishi, Jason P. Burgess, Soedarsono Riswan, Fransisca M. Setyowati, Achmad M. Saribi, Djaja D. Soejarto, Norman R. Farnsworth, Joseph O. Falkinham, David J. Kroll, A. Douglas Kinghorn, Mansukh C. Wani, Nicholas H. Oberlies