prov:value
| - Preferred compounds are those of the formula IIIa, and especially those of the formula IIa, in which X is chlorine, R is methyl and especially hydrogen, R1 is hydrogen, Cl, Br, F, I, --CH???CHCN, --CH???CHCOOCH3, --CH???CHCOOC2 H5, C1-4 -alkyl, especially methyl or ethyl, methoxy, N,N-dimethylamino, --NO2, --CN, formyl, methylsulfonyl or phenyl, R2 is hydrogen, Cl, Br, methyl, ethyl, methoxy or ni
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