tert-butyl 2-amino-7,8-dihydro-1,6-naphthyridine-6 (5H)-carboxylate;tert-butyl 2-amino-7,8-dihydro-1,6-naphthyridine-6(5H)-carboxylate;1,1-dimethylethyl 2-amino-7,8-dihydro-1,6-naphthyridine-6(5H)-carboxylate;
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