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 17-ethyl-19-(2,2,2-trifluoroacetyl)-13-oxa-3,19-diazahexacyclo[14.3.1.02,10.04,9.010,15.012,17]icosa-2,4,6,8-tetraen-14-one .
user
C21H19F3N2O3
assistant