You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-N-[(E)-but-2-en-2-yl]-4-N-[[4-(2-methylpropyl)furan-2-yl]methyl]-1-oxo-1,2,5-thiadiazole-3,4-diamine is the IUPAC name of a molecule. Please give its molecular formula.
user
C15H22N4O2S
assistant