Novel indoleamine 2, 3-dioxygenase inhibitor, preparation method thereof and pharmaceutical composition containing same

The present invention provides a novel compound having a cyclohexyl-(alkyl or cycloalkyl substituted) ethylidene-amino-heteroaryl moiety (cyclohexyl-(alkyl or cycloalkyl-substituted) ethene-amine-hetero-aryl), or a pharmaceutically acceptable salt thereof, a process for the preparation thereof, a pharmaceutical composition comprising the same, and a use thereof. The present invention also provides a pharmaceutical composition comprising the same, and a pharmaceutical composition comprising the same. According to the present invention, the compound or the pharmaceutically acceptable salt thereof not only has excellent inhibitory activity on indoleamine 2, 3-dioxygenase (IDO), but also has a significantly high in-vivo exposure after oral administration, such that the compound or the pharmaceutically acceptable salt thereof can be used in the preparation of drugs for treating indoleamine 2, 3-dioxygenase (IDO), and can be used in the preparation of drugs for treating indoleamine 2, 3-dioxygenase (IDO), such as i