Synonyms: Irbesartan Related Compound A (USP), 1-[(1-Oxopentyl)amino]-N-[[2′-(2H-tetrazol-5-yl)[1,1′-biphenyl]-4-yl]methyl]-cyclopentanecarboxamide,1-(Pentanoylamino)-N-[[2′-(1H-tetrazol-5-yl)biphenyl-4-yl]methyl]cyclopentanecarboxamide, Irbesartan Imp. A (EP)