prov:value
| - C2 alkoxy-C1 -C4 alkyl, C2 -C3 alkanoyloxy-C1 -C3 alkyl, benzoyloxy-C1 -C4 alkyl, hydroxy-C1 -C4 alkyl, C2 -C3 alkanoyloxy-C2 -C4 alkanoyl, benzoyloxy-C2 -C4 alkanoyl, C1 -C4 alkoxy-C2 -C3 alkanoyl, hydroxy-C2 -C4 alkanoyl, phenoxy-C2 -C4 alkanoyl or halo-C2 -C4 alkanoyl, R3 ' is as defined in claim 5, A and B are carbonyl groups, or one of A and B is absent and the other is a carbonyl group, n' i
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