(3aR,8aR)-5-Benzyl-2,2-dimethyl-hexahydro-1-oxa-3,5-diaza-azulene-3-carboxylic acid tert-butyl ester

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

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

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