You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-N,1-N,2-trimethyl-1-N'-pyridin-2-yl-1-N'-thiophen-2-ylpropane-1,1-diamine The above is the IUPAC name of a molecule. Write its molecular formula.
user
C15H21N3S
assistant