You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
trimethyl (1R,7R)-1-[(1R,2S)-2-acetyloxy-1-hydroxypropyl]-7-(2-methoxy-2-oxoethyl)-3-oxo-1,2-dihydropyrazolo[1,2-a]pyrazole-5,6,7-tricarboxylate is the IUPAC name of a molecule. Please give its molecular formula.
user
C20H26N2O12
assistant