Patent ID: 7714139

Claim:
A compound having indoleamine 2,3 dioxygenase (IDO) inhibitory activity, said compound having the: wherein R 1 is H or lower alkyl; R 2 and R 3 are joined together and represent part of a ring which is fused to the pyrrole moiety of formula (I) and which is selected from the group of: (ii) wherein R E is a hydrocarbyl or alkyl-Q, Q representing a substituent of the formula: the compound of formula (I) being a brassilexin derivative when R 2 and R 3 joined together represent (i), and an N-substituted brassilexin derivative when R 2 and R 3 joined together represent (ii); X, Y, and Z may be the same or different and are selected from the group consisting of H, halogen, NO 2 , and hydrocarbyl; or Y may also be isothiocyanate.