Valsartan Desvaleryl Impurity

: Des(oxopentyl) Valsartan; N-(1-Carboxy-2-methylprop-1-yl)-N-[2′-(1H-tetrazol-5-yl)-biphenyl-4-ylmethyl]amine; N-[[2’-(2H-Tetrazol-5-yl)[1,1’-biphenyl]-4-yl]methyl]-L-valine; N-[[2’-(1H-Tetrazol-5-yl)[1,1’-biphenyl]-4-yl]methyl]-L-valine;