You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-N-ethyl-2-methyl-1-N-propan-2-yl-1-N-(thiophen-2-ylmethyl)propane-1,2-diamine The above is the IUPAC name of a molecule. Write its molecular formula.
user
C14H26N2S
assistant