Irbesartan Crystal Form B

Irbesartan [2-butyl-3-{[2'-(2H-tetrazol-5-yl)biphenyl-4-yl]methyl}-1,3-diazaspiro[4.4]non-1-en-4-one, C₂₅H₂₈N₆O], a highly selective angiotensin II receptor (AT₁) antagonist was found to exist in two distinct crystal forms (A and B). This paper describes the crystal structure of irbesartan form B.

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