You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2S,5R,6S)-6-[[5-(4-fluorophenyl)-3-methyl-1,2-oxazol-4-yl]amino]-3,3,6-trimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H20FN3O4S
assistant