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CAS 21658-72-0 is the registry number for Diethyl 5,5-difluoro-1,3,7,9,10-pentamethyl-5H-4l4,5l4-dipyrrolo[1,2-c:2',1'-f][1,3,2]diazaborinine-2,8-dicarboxylate, 98%. Offered by: Chemat Brand. Available pack sizes: on request.