You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 3-[2-[[methyl-[(2-methylcyclopropyl)methyl]amino]methyl]thiophen-3-yl]prop-2-yn-1-amine by IUPAC nomenclature, provide its molecular formula.
user
C14H20N2S
assistant