You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[5-[3-[(dimethylamino)methyl]thiophen-2-yl]-1,2,4-oxadiazol-3-yl]-N-methylpropan-2-amine is the IUPAC name of a molecule. Please give its molecular formula.
user
C13H20N4OS
assistant