IUPAC:(3aR,4R,5R,9aS,9bR)-4-hydroxy-6,9-dimethyl-3-methylidene-2,7-dioxo-2H,3H,3aH,4H,5H,7H,9aH,9bH-azuleno[4,5-b]furan-5-yl (2Z)-2-methylbut-2-enoate
IUPAC:(3aR,4R,5R,9aS,9bR)-4-hydroxy-6,9-dimethyl-3-methylidene-2,7-dioxo-2H,3H,3aH,4H,5H,7H,9aH,9bH-azuleno[4,5-b]furan-5-yl (2Z)-2-methylbut-2-enoate