You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule 3-amino-6-(2-chlorophenyl)-4-(difluoromethyl)-N-(pyridin-3-ylmethyl)thieno[2,3-b]pyridine-2-carboxamide .
user
C21H15ClF2N4OS
assistant