You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 5-[[cyclopropyl(thiophen-3-ylmethyl)amino]methyl]-N-ethyl-1,3,4-thiadiazol-2-amine by IUPAC nomenclature, provide its molecular formula.
user
C13H18N4S2
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