2,2-Dimethyl-propionic acid (1aS,7bR)-4-[(S)-1-(tert-butyl-dimethyl-silanyloxy)-ethyl]-1a,2,3,7b-tetrahydro-1-oxa-7-aza-cyclopropa[a]naphthalen-6-ylmethyl ester

(2S,3S)-2-[(7R,8S)-4-[(S)-1-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-2-(2,2-dimethyl-propionyloxymethyl)-8-hydroxy-7,8-dihydro-quinolin-7-ylamino]-3-methyl-pentanoic acid tert-butyl ester

(2S,3S)-2-[(7R,8S)-8-(tert-Butyl-dimethyl-silanyloxy)-4-[(S)-1-(tert-butyl-dimethyl-silanyloxy)-ethyl]-2-(2,2-dimethyl-propionyloxymethyl)-7,8-dihydro-quinolin-7-ylamino]-3-methyl-pentanoic acid tert-butyl ester

(7R,8S)-7-[((1S,2S)-1-tert-Butoxycarbonyl-2-methyl-butyl)-(2,2,2-trifluoro-acetyl)-amino]-8-(tert-butyl-dimethyl-silanyloxy)-4-[(S)-1-(tert-butyl-dimethyl-silanyloxy)-ethyl]-7,8-dihydro-quinoline-2-carboxylic acid