| http://www.w3.org/ns/prov#value | - R4 and R5 are independently of each other hydrogen, halogen, C1-C8alkyl, C1-C6alkoxy, C1-C4haloalkyl, CN, NO2, C2-C6alkanoyl, benzoyl, phenyl, ???S-phenyl, OR6, SR9, NR7R8, C2-C6alkoxycarbonyl or phenoxycarbonyl, or R4 and R5 together are a direct bond;
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