Synonyms: diethyl 2,9-dichloro-10b,10c-dihydrodibenzo[d,d']cyclobuta[1,2-b:4,3-b']difuran-5a,5b-dicarboxylate;67194-00-7;AC1Q3SPK;AC1L4T9C;AR-1I4422;cis,Syn photodimer of ethyl 5-chlorobenzofuran-2-carboxylate;Cyclobuta(1,2-b:4,3-b')bisbenzofuran-5a,5b-dicarboxylic acid, 2,9-dichloro-10b,10c-dihydro-, diethyl ester, (5aalpha,5balpha,10balpha,10calpha)-;Diethyl (4b-alpha,4c-alpha,9a-alpha,9b-alpha)-3,6-dichlorocyclobuta(1,2-b:3,4-b')bisbenzofuran-9a,9b(4bH,4cH)-dicarboxylate