| abstract |
The present invention belongs to the technical field of pharmaceuticals, and particularly relates to a compound represented by the formula I, a pharmaceutically acceptable salt thereof, and a stereoisomer thereof (R 4 , R 4 ', R 5 , R 5 ', R. 6 , R 7 , R 1a , R 2a , m, n, t 1 , and t 2 are as defined herein); the present invention relates further to the crystalline form of the compound represented by formula I. , The present invention is also for treating pharmaceutical formulations, pharmaceutical compositions, methods of preparing these compounds and their crystalline forms, and related diseases caused by abnormalities in indolamine 2,3-dioxygenase (IDO). Regarding its use in the manufacture of drugs. [Selection diagram] None |