The invention presents a biguanide derivative or its salt expressed by a formula: ##STR1## (where R.sup.1 and R.sup.2 are as defined in Specification), or formula: ##STR2## (where A and R.sup.3 is as defined in specification). This biguanide derivative or its salt is preferably used as the effective amount of a disinfectant for humans, animals, medical appliances, etc.
该发明提供了一种由以下式子表示的双胍衍
生物或其盐:##STR1## (其中R.sup.1和R.sup.2如规范中所定义),或式:##STR2## (其中A和R.sup.3如规范中所定义)。该双胍衍
生物或其盐可作为人类、动物、医疗器械等的消毒剂的有效成分。