| abstract |
A compound of formula (I): ** see formula ** in which: R1 is an optionally substituted 5 or 6 membered heteroaryl group selected from: i) a single 5 or 6 membered ring comprising 1 or 2 atoms of nitrogen and optionally comprising an additional heteroatom selected from oxygen or sulfur; ii) a 5 or 6 member ring comprising 3 nitrogen atoms; or iii) a 5 or 6-membered ring comprising 1 or 2 nitrogen atoms fused to a benzene ring or a second optionally substituted 5 or 6-membered heteroaryl ring comprising 1 or 2 nitrogen atoms, in which the substituents Optional for R1 comprise one or two substituents selected from the group consisting of amino, mono- or C1-6-dialkyl, C1-6 alkyl, C1-6 alkoxy, nitro and piperidin-4-yl, and R2 is vinyl or ethyl, or a pharmaceutically acceptable salt thereof. |