Patent 7105523 was granted and assigned to Bayer on September, 2006 by the United States Patent and Trademark Office.
This invention relates to compounds of the formulawherein R1 is H or a di-C1-6-alkylaminocarbonyl raical, and R2 is a radical of the formula —O—C(X)—NR3R4 wherein X is O or S. A process for preparing such compounds, pharmaceutical compositions containing them, and methods for using them in treatment of hypertension are also disclosed and claimed.