for the following products
N-[(2?-(1-triphenylmethyl-tetrazole-5-yl)biphenyl-4-yl]-methyl]-N-valeryl-L-valine methyl ester | N-[2'-(1H-Tetrazol-5-yl)biphenyl-4-yl methyl]-N-valeryl-(l)-valine methyl ester | Valsartan Impurity 5 and Valsartan methyl ester
