| http://www.w3.org/ns/prov#value | - Smith et al., U.S. Pat. No. 4,309,443, disclose cinnamic acid derivatives of the formula (V): ##STR5## wherein R1 and R2 and R3 are as defined in relation to formula (II); R4 is a hydrogen, chlorine or fluorine atom or a methyl, methoxyl or hydroxyl group or a carboxylic acid group or a salt, ester or amide thereof; R5 and R6 are a hydrogen atom or methyl group; R7 and R8 are a hydrogen atom or me
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