You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule ethyl 3-[(3-carbamoyl-4,5,6,7-tetrahydropyrazolo[1,5-a]pyridin-5-yl)methylcarbamoyl]-5-nitrobenzoate .
user
C19H21N5O6
assistant