Coumarin 30 (CAS No.41044-12-6), its synonyms are 7-Diethylamino-3-(1-methyl-2-benzimidazolyl)coumarin ; 3-(2-N-Methylbenzimidazolyl)-7-N,N-diethylaminocoumarin ; 7-(Diethylamino)-3-(1-methyl-1H-benzimidazol-2-yl)-2-benzopyrone .