Crystalline, anhydrous sigma-form of 2-(4-(2-furoyl)-(2-piperazin)-1-yl)-4-amino-6,7-dimethoxy-quinazoline hydrochloride and a process for its preparation
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United States of America Patent
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Mar 28, 1989
Grant Date -
N/A
app pub date -
Mar 3, 1987
filing date -
Mar 21, 1986
priority date (Note) -
Expired
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Abstract
A new anhydrous crystalline form of prazosine hydrochloride characterized by the following bands in the infra-red spectrum in potassium bromide is described: 3445 cm.sup.-1 (2.90 .mu.m), 1010 cm.sup.-1 (9.90 .mu.m) (duplet), and 768 cm.sup.-1 (13.03 .mu.m). This new form is distinguished by its surprisingly great stability in storage compared with known polymorphous forms of prazosine.
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