Analogifremgangsmaade for the preparation of 1,2-diaminocyclobuten-3,4-diones and cyclobutene-3,4-dione derivatives for use as intermediates in the process

摘要

Certain 1-(substituted amino)-2-(amino or substituted amino)cyclobutene-3,4-diones are potent histamine H2-antagonists useful in the treatment of peptic ulcers.