写好的CIF在check CIF时出现以下问题，请各位大侠帮忙解答！小虫在此先谢过！！
PUBL022_ALERT_1_A There is a mismatched ~ on line 154
The title compound, C~20~H~21~N~O~5~, which was synthesized according to the
If you require a ~ then it should be escaped
with a \, i.e. \~
Otherwise there must be a matching closing ~, e.g. C~2~H~4~
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