Moxonidine75438-57-2100 % similar Clonidine4205-90-742 % similar Clonidine hydrochloride4205-91-839 % similar Apraclonidine66711-21-538 % similar Apraclonidine hydrochloride73218-79-836 % similar Tizanidine51322-75-936 % similar Tizanidine hydrochloride64461-82-134 % similar