Synonyms: (4s,4ar,7ar,8r,9ar)-4-hydroxy-3,4a,8-trimethyl-4,4a,7a,8,9,9a-hexahydroazuleno[6,5-b]furan-2,5-dione;Isohelenalin;AC1Q6CNR;AC1L4V4A;KST-1A5777;AR-1A6107;(3aR,5R,5aR,8aR,9S)-9-hydroxy-1,5,8a-trimethyl-4,5,5a,9-tetrahydro-3aH-azuleno[6,7-b]furan-2,8-dione;Azuleno(6,5-b)furan-2,5-dione, 4,4a,7a,8,9,9a-hexahydro-4-hydroxy-3,4a,8-trimethyl-, (4S-(4alpha,4abeta,7aalpha,8alpha,9aalpha))-