biguanide

noun

bi·​gua·​nide (ˈ)bī-ˈgwän-ˌīd, -əd 

: a strong base C₂H₇N₅ that is soluble in water and alcohol

also : any of various derivatives of this base including some (such as chlorhexidine) that are used as antiseptic and disinfecting agents and others (such as metformin) that are used in the treatment of type 2 diabetes see proguanil