1-{3-cyano-5-[(ethylthio)carbonyl]-6-[(2-oxopyrrolidin-1-yl)methyl]pyridin-2-yl}piperidine-4-carboxylic acid   、                                                                                      
1-cyclopentylmethanesulfonamide                                                                                                                                                                                                                                                                                                          以to give S-ethyl 5-cyano-6-(4-{[(cyclopentylmethyl)sulfonyl]carbamoyl}piperidin-1-yl)-2-[(2-oxopyrrolidin-1-yl)methyl]pyridine-3-carbothioate的产率得到S-ethyl 5-cyano-6-(4-(((cyclopentylmethyl)sulfonyl)carbamoyl)piperidin-1-yl)-2-[(2-oxopyrrolidin-1-yl)methyl]pyridine-3-carbothioate