| http://www.w3.org/ns/prov#value | - ygen, R1 and R2 are identical or different and represent methyl, ethyl, propyl, isopropyl, chlorine, bromine, CF3, vinyl or cyclopropyl, where both substituents are in the ortho-position to the bridge bond, R4 and R5 independently of one another represent methyl, fluorine or chlorine or in particular represent hydrogen, and R7 represents hydrogen. 6.
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