Synonyms: 1,1'3,3'-Tetramethylspiro(2,3-dihydrobenzimidazole-2,2'-(2,3)dihydro(1H)perimidine;99643-43-3;1,1'3,3'-Tetramethylspiro[2,3-dihydrobenzimidazole-2,2'-[2,3]dihydro[1H]perimidine;AC1L3R06;1,1',3,3'-tetramethylspiro[benzimidazole-2,2'-perimidine];1,1',3,3'-tetramethyl-1,3-dihydro-1'H,3'H-spiro[benzimidazole-2,2'-perimidine]