1,2,3,3a,8,8a-Hexahydro-2,2-dimethyl-8-methylene-5,6-azulenedicarboxaldehyde (3aS-cis)- 109884-00-6 5,6-Azulenedicarboxaldehyde, 1,2,3,3a,8,8a-hexahydro-2,2-dimethyl-8-methylene-, (3aS-cis)-