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[求助] 有哪位大侠做过盐酸左西替利嗪反应液的跟踪,求教液相分析问题

最后一步,哌嗪乙醇和盐酸左西替利嗪液相峰总是分不开,我用的液相条件:232nm,依利特:C18,150*4.6;MeCN : KH2PO4 (0.02mol/L) = 35:65, 流速:1.0,两个峰均出在7.4左右,换250mm的长柱也没太大影响,怎么变换条件,效果会好呢? 求指点,结构如下

有哪位大侠做过盐酸左西替利嗪反应液的跟踪,求教液相分析问题
结构.JPG
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