(R)-2-[(1S)-1-{[(9H-fluoren-9-ylmethoxy)carbonyl]amino}ethyl]-4-methyl-4,5-dihydro-1,3-thiazole-4-carboxylic acid allyl ester

(2S,3S)-2-Benzyloxycarbonylamino-3-methyl-pent-4-enoic acid methyl ester

(2S,3S)-2-Benzyloxycarbonylamino-3-methyl-5-triisopropylsilanyloxy-pentanoic acid methyl ester

(2S,3S)-2-(benzyloxycarbonylamino)-3-methylpent-4-enoic acid

(2S,3S)-2-[N-(tert-butoxycarbonyl)-N-methylamino]-3-methyl-5-[(triisopropylsilanyl)oxy]pentanoic acid allyl ester