58262-52-5

[(3as,5s,5as,8ar,9s,9as)-5,8a-dimethyl-1-methylidene-2,4,8-trioxo-5,5a,9,9a-tetrahydro-3ah-azuleno[6,5-b]furan-9-yl] 3-methylbut-2-enoate