for the following products
2-Butyl-3-[[2'-cyano-[1,1'-biphenyl]-4-yl]methyl]-1,3-diazaspiro[4,4]non-1-en-4-one | 4'-[(2-n-Butyl-4-oxo-1,3-diazaspiro[4.4]non-1-en-3-yl)methyl]-(1,1'-biphenyl)-2-carbonitrile | Irbesartan cyano impurity | [1,1'-Biphenyl]-2-carbonitrile,4'-[(2-butyl-4-oxo-1,3-diazaspiro[4.4]non-1-en-3-yl)methyl] and 4'-[(2-Butyl-4-oxo-1,3-diazaspiro[4.4]non-1-en-3-yl)-methyl][1,1'-biphenyl]-2-carbonitrile
