You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
potassium;methanol;methyl 2-oxo-2-(1H-pyrrolo[2,3-b]pyridin-3-yl)acetate;2-oxo-2-(1H-pyrrolo[2,3-b]pyridin-3-yl)acetate is the IUPAC name of a molecule. Please give its molecular formula.
user
C20H17KN4O7
assistant