13447-95-5 3804-89-5 EINECS 236-605-3 Isoniazid methanesulfonate Isonicotinic acid 2-(sulfomethyl)hydrazine Metaniazida [INN-Spanish] Metaniazide [DCIT] Methaniazide Methaniazide [INN] Methaniazidum [INN-Latin]