| http://www.w3.org/ns/prov#value | - ted from methyl, ethyl, chlorine, bromine and iodine, or a cyclohexyl group; R3 is a hydrogen atom, a methyl group, an ethyl group or a phenyl group; and R4 is a hydrogen atom, a methyl group, an ethyl group, an isopropyl group, a phenyl group, a p-methylphenyl group or a benzyl group.
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