rac-(3aR,6aS)-tetrahydrospiro[cyclopenta[c]furan-4,2'-[1,3]dioxolan]-1(3H)-one

(1R,2S)-2-Methanesulfonylmethyl-3-oxo-cyclopentanecarboxylic acid methyl ester

9',10'-dihydro-5-carbomethoxyspiroethanoanthracen>-2-one

(2S,3R)-3-Hydroxymethyl-2-methylsulfanylmethyl-cyclopentanone

4-<2-(methoxycarbonyl)ethyl>tetrahydrofura-2-one