etandiimidamider as intermediate foer framstaellning of histamine h2 receptor antagonists and foerfarande foer framstaellning daerav

摘要

Histamine H2-receptor antagonists of the formula IMAGE wherein A, m, Z, n and R1 are as defined herein, and their nontoxic pharmaceutically acceptable salts, hydrates and solvates are novel anti-ulcer agents which are prepared by ring closure of a substituted ethanediimidamide of the formula IMAGE