Jang DS, Cuendet M, Hawthorne ME, Kardono LB, Kawanishi K, Fong HH, Mehta RG, Pezzuto JM, Kinghorn AD. Prenylated flavonoids of the leaves of Macaranga conifera with inhibitory activity against cyclooxygenase-2. Phytochemistry. 2002 Dec; 61(7):867-72.