6995-10-4 (Z)-2-Methyl-2-butenoic acid [(3S)-2,3,3aα,4,4a,5,7aα,8,9,9aα-decahydro-9β-hydroxy-3β,4aβ,8α-trimethyl-2,5-dioxoazuleno[6,5-b]furan-4α-yl] ester 69956-55-4 Benzo[3,4]cyclobuta[1,2-d]-1,3-dioxole, 3a,3b,7a,7b-tetrahydro-, (3a-alpha-,3b-alpha-,7a-alpha-,7b-alpha-)- (9CI)