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 (6S)-N-(2,4-dimethylphenyl)-6-(4-fluorophenyl)-6,7-dihydro-4H-triazolo[5,1-c][1,4]oxazine-3-carboxamide ?
user
C20H19FN4O2
assistant