You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named [ethylsulfanyl-(prop-2-enylamino)methylidene]-[2-[ethylsulfanyl-(prop-2-enylamino)methylidene]azaniumylethyl]azanium by IUPAC nomenclature, provide its molecular formula.
user
C14H28N4S2+2
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