| prov:value
| - And a cyclohexylcarbonyloxy group is preferred.An (alkyl having a carbon number of 1-12)-substituted benzoyl group, which is provided with preferably 1-3 and most preferably 1-2 alkyl groups, is a o-, m- or p-methylbenzoyl group, a 2,3-dimethylbenzoyl group, a 2,4-dimethylbenzoyl group, a 2,5-dimethylbenzoyl group, a 2,6-dimethylbenzoyl group, a 3,4-dimethylbenzoyl group, a 3,5-dimethylbenzoyl gro
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