tert-butyl (1R,6S)-8-(1(S)-phenylethyl)-3,8-diazabicyclo[4.2.0]octane-3-carboxylate

(1S,6R)-8[(1R)-1-phenyl-ethyl]-3,8-diaza-bicyclo[4.2.0]octane-3-carboxylic acid tert-butyl ester

(3S,4S)-4-hydroxymethyl-3-[(1R)-1-phenyl-ethylamino]-piperidine-1-carboxylic acid tert-butyl ester

(R)-N-Boc-4-ethyloxycarbonyl-3-(1-phenylethylamino)-5,6-dihydropyridine

3-((1R)-1-phenyl-ethylamino)-piperidine-1,4-dicarboxylic acid 1-tert-butyl ester 4-ethyl ester