95833-19-5

DA 4643 is one of histamine H2-receptor antagonistic. Two histamine H2-receptor antagonists of the phenylformamidine type, mifentidine (N-isopropyl-N'-(4-1H-imidazol-4-yl-phenyl) formamidine dihydrochloride; I) and DA 4643 (N-methyl-N'-(3-(2-guanidinothiazol-4-yl)-phenyl) formamidine dihydrochloride; II), have been investigated by experimental physico-chemical studies and theoretical conformational analysis. Both mifentidine and DA 4643 interact with the histamine H2-receptor at the same site, utilizing in the binding process the same, or closely similar, receptor structural features.

DA 4643（盐酸盐）是一种H2受体拮抗剂，其化学名为2-胍基-4(3-甲基氨基亚甲基亚氨基苯基)噻唑二盐酸盐。它与细胞色素P-450的相互作用较弱，比西咪替丁和替奥替丁对P-450的抑制作用更小。DA 4643（盐酸盐）能够抑制酶促和非酶促脂质过氧化反应。这种抑制作用可能不是通过抑制试剂代谢酶实现的，而是由于该化合物本身具有抗氧化特性。与其他H2受体拮抗剂如西咪替丁、雷尼替丁和替奥替丁相比，DA 4643（盐酸盐）在脂质过氧化抑制方面表现出独特的作用。这些特性使DA 4643（盐酸盐）成为一种潜在的具有多重作用机制的H2受体拮抗剂。