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 (2R,3R,3aS,9bS)-1-(cyclobutanecarbonyl)-3-(hydroxymethyl)-6-oxo-N-(2,2,2-trifluoroethyl)-3,3a,4,9b-tetrahydro-2H-pyrrolo[2,3-a]indolizine-2-carboxamide ?
user
C19H22F3N3O4
assistant