residue_atom_renaming_swaps
===========================

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20种氨基酸中有四种氨基酸的部分原子具有对称性。本表记录了每种氨基酸中具有对称不变性的原子对映射信息。key为氨基酸类型，value为不确定原子
对。

+-----------------------+-------------------------------+
| key                   | value                         |
+=======================+===============================+
| ASP                   | {'OD1': 'OD2'}                |
+-----------------------+-------------------------------+
| GLU                   | {'OE1': 'OE2'}                |
+-----------------------+-------------------------------+
| PHE                   | {'CD1': 'CD2', 'CE1': 'CE2'}  |
+-----------------------+-------------------------------+
| TYR                   | {'CD1': 'CD2', 'CE1': 'CE2'}  |
+-----------------------+-------------------------------+