You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[3-(3-amino-2-nitro-7-oxo-1,4,5,6-tetrahydroinden-1-yl)phenyl] 2-methoxyethyl carbonate is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H20N2O7
assistant