The present invention relates to compounds of formula (I), or pharmaceutically acceptable salts, prodrugs, salts of prodrugs, or combinations thereof,
wherein R
1
, R
2
, R
3
, R
4
, and L
2
, are defined in the specification, compositions comprising such compounds, and methods of treating conditions and disorders using such compounds and compositions.
本发明涉及式(I)的化合物,或其药学上可接受的盐、前药、前药的盐或其组合物,其中R1、R2、R3、R4和
L2在说明书中有定义,包括含有这样的化合物的组合物,以及使用这样的化合物和组合物治疗疾病和疾病的方法。