| 摘要 |
A compound having the formula: wherein: R is fluorine, hydrogen, an unsubstituted or substituted aliphatic or unsubstituted or substituted aromatic radical; R1 is an unsubstituted or substituted aliphatic radical, or unsubstituted or substituted aromatic radical; and R2 is hydrogen, an unsubstituted or substituted aliphatic radical, or unsubstituted or substituted aromatic radical.
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