You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[3-[4-(pyridin-2-ylmethyl)piperazin-1-yl]propanoylamino]-4,5,6,7-tetrahydro-1-benzothiophene-3-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C22H29N5O2S
assistant