Synonyms: NSC99008;13088-35-2;AC1L6B55;AR-1C1236;NSC 99008;NSC-99008;18-(dichloromethylidene)-17-oxapentacyclo[6.6.5.02,7.09,14.015,19]nonadeca-2,4,6,9,11,13-hexaen-16-one (non-preferred name);18-(dichloromethylidene)-17-oxapentacyclo[6.6.5.02,7.09,14.015,19]nonadeca-2,4,6,9,11,13-hexaen-16-one(non-preferred name)