prov:value
| - those compounds of the formula I being excluded in which Y is S and, at the same time, X is CH, u is the number 0, R4 is hydrogen and R6 is an R8- and R9-substituted cyclic system which is selected from the group consisting of benzene, furan, thiophene, thiazole, imidazole, triazole, tetrazole, thiadiazole, pyridine and pyrimidine.
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