1,2,3,10-tetrahydro-10-oxo-cyclopenta[d]pyrido[1,2-a]pyrimidine-7-carboxylic acid methyl ester                                                                                                                                                                                                                                                                                                          生成                                                 
3-(2-thenylidene)-1,2,3,10-tetrahydro-10-oxo-cyclopenta[d]pyrido[1,2,-a]pyrimidine-7-carboxylic acid   、                                                                                             3-(2-furfurylidene)-1,2,3,10-tetrahydro-10-oxo-cyclopenta[d]pyrido[1,2-a]pyrimidine-7-carboxylic acid