10-<3-(R)-(1-(S)-aminoethyl)-1-pyrrolidinyl>-9-fluoro-3-(S)-methyl-2,3-dihydro-7-oxo-7H-pyrido<1,2,3-de>-1,4-benzoxazine-3-carboxylic acid

7-[(R)-3-((S)-1-tert-Butoxycarbonylamino-ethyl)-pyrrolidin-1-yl]-1-cyclopropyl-6-fluoro-8-methyl-4-oxo-1,4-dihydro-quinoline-3-carboxylic acid

7-[(R)-3-((S)-1-tert-Butoxycarbonylamino-ethyl)-pyrrolidin-1-yl]-8-chloro-1-cyclopropyl-6-fluoro-4-oxo-1,4-dihydro-quinoline-3-carboxylic acid

(S)-9-[(R)-3-((S)-1-tert-Butoxycarbonylamino-ethyl)-pyrrolidin-1-yl]-8-fluoro-3-methyl-6-oxo-2,3-dihydro-6H-1-oxa-3a-aza-phenalene-5-carboxylic acid

1-benzyl-3-(R)-(1-(S)-tert-butoxycarbonylaminoethyl)pyrrolidine