prov:value
| - hydrogen atom, an alkyl group with 1 to 6 carbon atoms, an allyl, propargyl, benzyl, chlorobenzyl, phenylethyl, cyclopentyl or cyclohexyl group; and, R4 is a hydrogen atom, an alkyl group having 1 to 3 carbon atoms or an allyl group; or, R3 and R4 together with the nitrogen atom between them for a piperidino, hexamethyleneimino or morpholino group; or, a pharmaceutically acceptable acid addition
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