3-Oxo-cyclopentanecarboxylic acid butyl ester                                                                                                                                                              在
                                                                                                                                                                                 sodium dithionite                                                                                                                                  作用下,
                                                                                                                                                                                                                            生成                                                 
(1R,3S)-3-Hydroxy-cyclopentanecarboxylic acid butyl ester   、                                                                                             (1S,3R)-3-Hydroxy-cyclopentanecarboxylic acid butyl ester   、                                                                                             (1S,3S)-3-Hydroxy-cyclopentanecarboxylic acid butyl ester