溶剂到不一定非使用二氯甲烷，但不提取多数情况下不行的，干扰物太多，杂质太多，仪器的负担大，色谱柱寿命短，离子源污染，总之得不偿失啊。... The reaction solution was evaporated to dryness by rotary evaporator. The residue was trimethylsilylated with 0.1 mL hexamethyldisilazane and 0.05 mL chlorotrimethylsilane at room temperature. All photoproducts were extracted by dichloromethane and identified as silylation forms. 这是文章里的一段话。除了需要萃取，还要再转化成甲硅烷基化的形式么？这是必须的么，
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