1-(3-{5-cyano-2-[(R)-6-methoxycarbonyl-7-methyl-3-oxo-8-(3-trifluoromethylphenyl)-2,3,5,8-tetrahydro-[1,2,4]triazolo[4,3-a]pyrimidin-5-yl]phenyl}propyl)pyridinium benzenesulfonate 在
amberlite IRA 458 ‘chloride’ resin 作用下,
以
水 、
乙腈 为溶剂,
以0.44 g的产率得到1-(3-{5-cyano-2-[(R)-6-methoxycarbonyl-7-methyl-3-oxo-8-(3-trifluoromethylphenyl)-2,3,5,8-tetrahydro-[1,2,4]triazolo[4,3-a]pyrimidin-5-yl]phenyl}propyl)pyridinium chloride