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 (4aR,9bS)-N-(6-chloro-2-methylpyridin-3-yl)-5-methyl-6-(trifluoromethyl)-1,2,3,4,4a,9b-hexahydropyrido[4,3-b]indol-8-amine ?
user
C19H20ClF3N4
assistant