| http://www.w3.org/ns/prov#value | - e, the amino group or a phenylamino or lower alkylamino group, or in which R3 and R4 together with the nitrogen atom form a ring containing a lower alkylene radical and optionally a hetero-atom, such as, for example, a nitrogen atom or oxygen atom, such as, for example a morpholine, piperidine or piperazine ring.
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