CPC C07D 491/22 (2013.01) [A61P 35/00 (2018.01)] | 8 Claims |
1. A compound or a tautomer, a mesomer, a racemate, an enantiomer or a diastereoisomer thereof, or a mixture thereof, or a pharmaceutically acceptable salt thereof, wherein the compound comprises a structure shown as formula below:
![]() wherein, R2 is —O—, and R2 is used for direct or indirect linking to a ligand.
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