Histamine, Free Base - Moligand™, ≥96% , Activator of carbonic anhydrase 1;Activator of carbonic anhydrase 5A;Activator of carbonic anhydrase 7;Agonist of H 1 receptor;Agonist of H 2 receptor;Agonist of H 3 receptor;Agonist of H 4 receptor, CAS No.51-45-6, Activator of carbonic anhydrase 1;Activator of carbonic anhydrase 5A;Activator of carbonic anhydrase 7;Agonist of H 1 receptor;Agonist of H 2 receptor;Agonist of H 3 receptor;Agonist of H 4 receptor