InChI=1/C12H10N4O3/c1-3-19-12(18)10(17)9-6-14-11-8(4-13)5-15-16(11)7(9)2/h5-6H,3H2,1-2H ethyl (3-cyano-7-methylpyrazolo[1,5-a]pyrimidin-6-yl)(oxo)acetate pyrazolo[1,5-a]pyrimidine-6-acetic acid, 3-cyano-7-methyl-alpha-oxo-, ethyl ester