prov:value
| - d selected from among (C1 -C8)-alkyl and (C1 -C8)-alkoxy, to be replaced by a joint C--C bond which links these two substituents, with the proviso that R4 and R5 cannot simultaneously both be hydrogen, and that, in the event that one of the radicals R4 and R5 is hydrogen, the other cannot be methyl, and that, in the event that A, B, D, V and W are in each case CH, E is CF, X is O and Y is a bond,
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