(S)-1-((2S,3S,4R)-2-formyl-3-hydroxy-4-methyl-5-oxopyrrolidin-2-yl)-2-methylpropyl benzoate

(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

(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

methyl (2S,3S,4R)-2-((S)-1-acetoxy-2-methylpropyl)-3-hydroxy-4-methyl-5-oxopyrrolidine-2-carboxylate