(S)-1-((2S,3S,4R)-3-hydroxy-2-hydroxymethyl-4-methyl-5-oxo-pyrrolidin-2-yl)-2-methyl-propyl benzoate

(3R,4R,5S,6S,8R)-3,4-dihydroxy-6-isopropyl-3-methyl-8-phenyl-7,9-dioxa-1-azaspiro[4.5]decan-2-one

(2S,3S,4R)-2-((S)-1-benzoyloxy-2-methyl-propyl)-3-hydroxy-4-methyl-5-oxo-pyrrolidine-2-carboxylic acid

(3R,4R,5S,6S,8R)-6-isopropyl-3-methyl-8-phenyl-7,9,11,13-tetraoxa-12-thiocarbonyl-1-azaspiro[4.5]decan-2-one

(4S,5R)-4-(tert-butoxy)-5-(hydroxymethyl)pyrrolidin-2-one