You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
ethyl 6-chloro-1,1-dimethyl-4-(trifluoromethyl)-2,3-dihydropyrrolo[1,2-a]indole-3-carboxylate is the IUPAC name of a molecule. Please give its molecular formula.
user
C17H17ClF3NO2
assistant