You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule (6S)-3-[3-(3-ethoxyphenyl)-1,2,4-oxadiazol-5-yl]-6-(4-fluorophenyl)-6,7-dihydro-4H-triazolo[5,1-c][1,4]oxazine ?
user
C21H18FN5O3
assistant