Pengsuparp T, Cai L, Fong H H, Kinghorn A D, Pezzuto J M, Wani M C, Wall M E
Department of Medicinal Chemistry and Pharmacognosy, College of Pharmacy, University of Illinois at Chicago 60612.
J Nat Prod. 1994 Mar;57(3):415-8. doi: 10.1021/np50105a017.