5,7-diethyl-2-oxo-1-[(2'-(2-triphenylmethyl-2H-tetrazol-5-yl)biphenyl-4-yl)methyl]-1,2,3,4-tetrahydro-1,6-naphthyridin-6-oxide 以38%的产率得到5,7-diethyl-2-oxo-1-[(2'-(1H-tetrazol-5-yl)biphenyl-4-yl)methyl]-1,2,3,4-tetrahydro-1,6-naphthyridin-6-oxide hydrochloride