| http://www.w3.org/ns/prov#value | - A compound of formula (I) or a salt, ester, amide or prodrug thereof; R5 is an optionally substituted 6-membered aromatic ring containing at least one nitrogen atom, and R1, R2, R3, R4 are independently selected from halogeno, cyano, nitro, C1-3alkysulphonyl, ???N(OH)R7??? (wherein R7 is hydrogen, or C1-3 alkyl), or R9X1??? (wherein X1 represents a direct bond, ???O???, ???CH2???, ???OC(O)???, ???
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