You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
tert-butyl N-[(4aR,7aR)-7a-[5-(cyclopentylamino)-2-fluorophenyl]-4,4a,5,6-tetrahydrofuro[2,3-d][1,3]thiazin-2-yl]carbamate is the IUPAC name of a molecule. Please give its molecular formula.
user
C22H30FN3O3S
assistant