You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named N-[[2-(3-methylpyridin-4-yl)-4,5,6,7-tetrahydro-1,3-benzothiazol-4-yl]methyl]ethanamine by IUPAC nomenclature, provide its molecular formula.
user
C16H21N3S
assistant