You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
methyl 5-(1,3-dihydroxy-2-methylpropan-2-yl)-2-(3-methylphenyl)-3-oxopyrazolo[4,3-c]pyridine-7-carboxylate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H21N3O5
assistant