| http://www.w3.org/ns/prov#value | - at is preferably in the ??-position, an amino group of the above-defined formula ##STR6## preferably one in which R1 and R2 are each hydrogen in which case the group is preferably in the 1-position, or one or more halogen atoms, especially fluorine or chlorine, which are preferably adjacent to the carbonyl group.
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