Hydrazino Substituted Pyrimido Ä5,4-bÜthiazine Intermediates

摘要

Substituted 1,2,4-triazolo[1,5-c]pyrimido[1,4]azines have been found to have potent bronchodilator activity. Pharmacological methods for inducing bronchodilation using such compounds, pharmaceutical compositions containing such compounds, and synthetic intermediates for preparing such compounds are also described.