(4R,5R)-3-N-tert-butyloxycarbonyl-4-hydroxymethyl-5-((1''R,3''E)-1''-methylpent-3''-enyl)-2,2-dimethyl-1,3-oxazolidine

(4S,5R)-5-((Z)-(R)-1-Methyl-pent-3-enyl)-2-oxo-oxazolidine-4-carboxylic acid methyl ester

(4S,5R)-3-N-tert-butyloxycarbonyl-4-methoxycarbonyl-5-((1''R,3''Z)-1''-methylpent-3''-enyl)-2,2-dimethyl-1,3-oxazolidine

(4R,5R)-5-((R)-3-Benzyloxycarbonylamino-1-methyl-propyl)-4-(tert-butyl-diphenyl-silanyloxymethyl)-2,2-dimethyl-oxazolidine-3-carboxylic acid tert-butyl ester