Linear, polymeric polyoxyalkylenediamine biguanide or water soluble salt thereof. The biguanide is useful as a biocide in bactericidal and fungicidal compositions and is especially useful as the active ingredient in ophthalmic compositions.

 
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> 4-aralkyl-2-nitro-2'-hydroxy-3',5'-dialkyl (or cumyl)-azobenzenes
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