Three new quassinoids isolated from the wood of Picrasma javanica and their anti-Vpr activities

Prema, Chin Piow Wong, Takeshi Kodama, Alfarius Eko Nugroho, Ahmed H. El‐Desoky, Maurice Ducret Awouafack, Yi Yi Win, Hla Ngwe, Ikuro Abe, Hiroshi Morita, Hiroyuki Morita