You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-(2,3-dihydro-1-benzothiophen-2-yl)-N-methyl-1H-imidazo[4,5-b]pyridin-5-amine is the IUPAC name of a molecule. Please give its molecular formula.
user
C15H14N4S
assistant