1-(3-Chlorophenyl)biguanide 1-(m-Chlorophenyl)biguanide 2113-05-5 48144-44-1 Imidodicarbonimidic diamide, N-(3-chlorophenyl)- N-(3-Chlorophenyl)imidodicarbonimidic diamide m-Chlorophenylbiguanide mCPBG