Synonyms: 2H,6H,10H-Benzo[1,2-b:3,4-b':5,6-b'']tripyran-2-one,11,12-dihydro-12-hydroxy-6,6,10,11-tetramethyl-4-propyl-, (10R,11S,12S)- (9CI);2H,6H,10H-Benzo[1,2-b:3,4-b':5,6-b'']tripyran-2-one,11,12-dihydro-12-hydroxy-6,6,10,11-tetramethyl-4-propyl-, [10R-(10a,11b,12a)]-; (+)-Calanolide A; Calanolide A; NSC 650886