Cytotoxic pentacyclic and tetracyclic aromatic sesquiterpenes from Phomopsis archeri - Hemtasin, C; Kanokmedhakul, S; Kanokmedhakul, K; Hahnvajanawong, C; Soytong, K; Prabpai, S; Kongsaeree, P (J Nat Prod, 2011)