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(1989)N2-<(S)-1-(ethoxycarbonyl)-3-phenylpropyl>-L-lysyl-L-proline
(R)-ethyl 2-bromo-4-phenylbutyrate
(R)-ethyl 2-chloro-4-phenylbutyrate
N6-(tert-butoxycarbonyl)-N2-<(S)-1-(ethoxycarbonyl)-3-phenylpropyl>-L-lysyl-L-proline tert-butylester
N-