a type of cyclic ester with a five-membered ring
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(3R,5S)-5-(tert-Butyl-diphenyl-silanyloxymethyl)-3-hydroxy-dihydro-furan-2-one
4'-O-tert-butyldimethylsilanyl-4'-O-demethyl-4-epipodophyllotoxin
(R)-4-Hydroxy-nonanoic acid