You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[[5-(2-fluorophenyl)furan-2-yl]methyl]-1-[(6S)-3-methyl-5,6,7,8-tetrahydro-[1,2,4]triazolo[4,3-a]pyridin-6-yl]methanamine is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H21FN4O
assistant