You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-N-[(1R,2S,4S)-2-bicyclo[2.2.1]hept-5-enyl]-4-N-[(1R,2R,4S)-2-bicyclo[2.2.1]hept-5-enyl]piperazine-1,4-dicarbothioamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C20H28N4S2
assistant