prov:value
| - where R13 is a hydrogen atom, a fluorine, chlorine or bromine atom or a methyl, difluoromethyl, trifluoromethyl, cyano, methoxy, difluoromethoxy or trifluoromethoxy group and R14 is a hydrogen atom or a methyl or cyano group, R2 is a methyl, ethyl, propyl, isopropyl, cyclopropyl or phenyl group, R3 is a 2-butyn-1-yl group or a 1-buten-1-yl, 2-buten-1-yl or 3-methyl-2-buten-1-yl group, and n is the
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