| http://www.w3.org/ns/prov#value | - TR9## in which: X represents S, SO2, ##STR10## each of R1, R2, R3, R4, R7 and R8 (same or different) represents hydrogen, halogen, an alkyl group or an aryl group, and each of R5 and R6 (same or different) represents hydrogen, an alkyl group, an aryl group or together represent the necessary atoms to close a cycloaliphatic ring, e.g. a cyclohexane ring, and wherein the aromatic ester units are pre
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