(3-{5-cyano-2-[(R)-6-methoxycarbonyl-7-methyl-3-oxo-8-(3-trifluoromethyl-phenyl)-2,3,5,8-tetrahydro-[1,2,4]triazolo[4,3-a]pyrimidin-5-yl]-phenyl}-propyl)-trimethyl-ammonium bromide 、
苯磺酸 在
amberlite IRA 458 'chloride' resin 作用下,
以
水 、
乙腈 为溶剂,
反应 0.83h,
以1.01 g的产率得到(3-{5-cyano-2-[(R)-6-methoxycarbonyl-7-methyl-3-oxo-8-(3-trifluoromethyl-phenyl)-2,3,5,8-tetrahydro-[1,2,4]triazolo[4,3-a]pyrimidin-5-yl]-phenyl}-propyl)-trimethyl-ammonium benzenesulfonate