图2 .
HPN衍生物1~5的高效液相色谱图谱
A：衍生物1；B：衍生物2；C：衍生物3；D：衍生物4；E：衍生物5. HPN：2-(4′-羟基苯基)-4,4,5,5-四甲基咪唑烷-1-氧基-3-氧化物； t R：保留时间.
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