You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the molecule identified by 6-acetamido-4-oxo-1-azatetracyclo[7.6.1.05,16.010,15]hexadeca-2,5,7,9(16)-tetraene-3-carboxylate ?
user
C18H17N2O4-
assistant