prov:value
| - In the general formula (I), the group denoted by R1 is selected from the class consisting of methyl, ethyl, propyl, vinyl, phenyl and 3,3,3-trifluoropropyl groups and the group denoted by X is an alkenyloxy group represented by the general formula (II), in which R2 and R3 are each a hydrogen atom or an alkyl group, e.g. methyl, ethyl and propyl groups.
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