You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule ethyl 2-[(1S,10R)-12-ethyl-5-methoxy-13-oxo-8-oxa-12,16-diazatricyclo[8.6.0.02,7]hexadeca-2(7),3,5-trien-16-yl]-2-oxoacetate into molecular formula.
user
C20H26N2O6
assistant