| 摘要 |
A process for the preparation of a compound of structure (I), in which n is 1 to 3 and each group R is hydrogen or alkyl, which comprises, reaction of a compound of structure (II), in which R1 is alkyl, phenyl or substituted phenyl and n is 1 to 3, with an amine HNR2 in which R is as described for structure (I), and optionally thereafter forming a salt.
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