| abstract |
Provided is a tryptophan-2,3-dioxygenase (TDO) and/or indoleamine-2,3-dioxygenase (IDO) inhibitor compound for use in medicine, which compound comprises the following formula: wherein X 1 , X 2 , X 3 , X 4 , and X 5 may be the same or different and each is independently selected from C, N and O; each atom having a dotted line may independently have a double bond or a single bond, provided that valencies at each atom are maintained; each R 1 , R 2 , R 3 , R 4 , R 5 , and R 7 may be present or absent and may be the same or different and is selected from H and a substituted or unsubstituted organic group, provided that the number of such R groups present is such that the valencies of X 1 , X 2 , X 3 , X 4 , and X 5 are maintained; one or two R 6 groups may be present and are selected from H and a substituted or unsubstituted organic group, provided that the number of R 6 groups present is such that the valency of the carbon atom to which they are attached is maintained, and provided that at least one R 6 is an organic group comprising an atom double-bonded to an oxygen atom (preferably a carbonyl group or a sulphonyl group) at an α-, β-, or γ-position to the carbon atom to which the R 6 is attached and in which the atom double-bonded to an oxygen atom is also bonded to a hetero-atom. |