You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance N-[[3-[(4-fluorophenyl)methyl]imidazo[4,5-b]pyridin-2-yl]methyl]thiophene-2-sulfonamide .
user
C18H15FN4O2S2
assistant