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 identified by (3aS,9bS)-6-(3,5-dimethyl-1,2-oxazol-4-yl)-3a-methyl-2,3,5,9b-tetrahydro-1H-isochromeno[3,4-c]pyrrole;2,2,2-trifluoroacetic acid ?
user
C19H21F3N2O4
assistant