cyano-(3,5'-dimethyl-5,3'-dioxo-1,2'-diphenyl-1,5,2',3'-tetrahydro-1'
H-[4,4']bipyrazolyl-4-yl)-acetic acid ethyl ester 生成
6-amino-3,3'-dimethyl-5'-oxo-1,1'-diphenyl-1',5'-dihydro-1H-spiro[pyrano[2,3-c]pyrazole-4,4'-pyrazole]-5-carboxylic acid ethyl ester