主权项 |
1. A compound of formula (I), or a pharmaceutically or veterinarily acceptable salt, solvate or hydrate thereof, a deuterated or tritiated variant thereof, or any stereoisomer thereof: wherein R1 is selected from the group consisting of H, F and OH; R2 is selected from the group consisting of C1-3 alkyl, C1-3 haloalkyl and cyclopropyl; provided that, when R1 is H, R3 is C1-3 haloalkyl. |