You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named N-butyl-2-[[6-(2,5-dichlorothiophen-3-yl)-5-oxo-4H-1,2,4-triazin-3-yl]sulfanyl]acetamide by IUPAC nomenclature, provide its molecular formula.
user
C13H14Cl2N4O2S2
assistant