You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance ethyl 5-chloro-1H-indole-2-carboxylate;ethyl 5-chloro-3-nitro-1H-indole-2-carboxylate;nitric acid .
user
C22H20Cl2N4O9
assistant