prov:value
| - A compound according to claim 1 wherein R' is CH3, COOCH3 or COOC2 H5 ; R is CH3 or C2 H5 ; L, M, Q and R7 are each H, Cl, Br, C1 -C4 alkyl, C1 -C2 alkoxy, CF3, NO2, CN, phenyl, phenoxy or difluoromethoxy; with the proviso that at least one of L, M, Q and R7 is a substituent other than H and that only one of L, M, Q or R7 may represent a substituent other than hydrogen, C1-C 4 alkyl or C1 -C2 alk
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