(2S,3R)-3-((R)-4-Azido-1-ethyl-butyl)-oxirane-2-carbaldehyde

(E)-(R)-7-Azido-4-ethyl-hept-2-enoic acid ethyl ester

(R)-2-Ethyl-4-oxo-butyric acid benzyl ester

(E)-(3R,6R,7R,10S,11R)-10-(tert-Butyl-dimethyl-silanyloxy)-3,11-diethyl-7-methyl-2-oxo-azacyclotetradec-8-ene-6-carboxylic acid methyl ester

(4R,5S)-1-((R)-2-Ethyl-pent-4-enoyl)-3,4-dimethyl-5-phenyl-imidazolidin-2-one