Synonyms: 2H-Pyran-5-carboxylicacid, 3,4-dihydro-3-hydroxy-6-(2-hydroxy-1,3-pentadienyl)-2-methyl-4-oxo-, d-lactone (7CI);4H,5H-Pyrano[4,3-b]pyran-4,5-dione,2,3-dihydro-3-hydroxy-2-methyl-7-(1-propenyl)-, [2S-[2a,3b,7(E)]]-; 4H,5H-Pyrano[4,3-b]pyran-4,5-dione,2,3-dihydro-3-hydroxy-2-methyl-7-[(1E)-1-propenyl]-, (2S,3S)- (9CI);4H,5H-Pyrano[4,3-b]pyran-4,5-dione, 2,3-dihydro-3a-hydroxy-2b-methyl-7-propenyl- (8CI); NSC 118343; Radicinin; Stemphylone