| http://www.w3.org/ns/prov#value | - The compounds are thus of use in medicine, for example in the prophylaxis and treatment of immune or inflammatory disorders as described hereinafter. [0012] Thus according to one aspect of the invention we provide a compound of formula (1) [0013] wherein [0014] Ar1 is an aromatic or heteroaromatic group; [0015] R1, R2, R3, R4 and R1 which may be the same or different is each an atom or group [0016
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