A compound of formula (II):
or a pharmaceutically acceptable salt or in vivo hydrolysable ester thereof, wherein one of R1 or R2 is hydrogen, and the other is an optionally substituted six-membered heteroaryl ring including one two or three nitrogen atoms, and R3 is hydrogen or an organic group.
式 (II) 的化合物:或其药学上可接受的盐或体内可
水解的酯,其中 R1 或 R2 之一为氢,另一个为任选取代的六元杂芳基环,包括一个两个或三个氮原子,R3 为氢或有机基团。