Abstract: There is provided a compound of formula R1—CO—X—Y—Z—R2 wherein X and Z are each optional groups that are, independently, saturated or unsaturated carbon chains having a length of 1 to 3 carbons; Y is SO, S, SO2, CH?CH, CH2CH2 or O; R1 is wherein denotes the point of attachment; R2 is a heteroaryl group comprising an optionally substituted 5 or 6 membered ring, which ring contains only carbon and at least one nitrogen, or contains only carbon, and at least two nitrogens and at least one sulfur; and wherein (i) when R1 is and —CO—X—Y—Z— is CO—CH2—SO, CO—CH2—S, or CO—CH2—SO2, R2 is other than and; (ii) when R1 is and —CO—X—Y—Z— is —CO—CH2—O—, R2 is other than

Abstract: There is provided a compound having Formula (I) R1-Z-R2 wherein R1 is a group selected from optionally substituted fused polycyclic groups, substituted alkyl groups, branched alkyl groups, and optionally substituted cycloalkyl groups Z is a linker which is or comprises a carbonyl group or a isostere of a carbonyl group R2 is selected from optionally substituted aromatic rings and optionally substituted heterocyclic rings wherein (a) R2 is a 2-substituted thiophene group, and/or (b) Z is a group of the formula —C(?O)—CR3R4—X—(CR5R6)n-, wherein X is selected from NR7, S, O, S?O, and S(?O)2, wherein n is 0 or 1 and/or (c) R1 is an adamantyl group and Z is or comprises an amide group, and/or (d) R1 is an adamantyl group and Z is or comprises a group of the formula —(CR8R9)p-NR10—S(?O)2—(CR11R12)q-, wherein p is 0 or 1 and q is 0 or 1 and/or (e) R1 is an adamantyl group and Z is or comprises a group of the formula —(CR13R14)V—Y—(CR15R16)W— where Y is a heteroaryl group in which a bond in the heteroaryl ring is a i