You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name [(13R)-13-tert-butyl-10-thia-3,5,6,8-tetrazatetracyclo[7.7.0.02,6.011,16]hexadeca-1(9),2,4,7,11(16)-pentaen-4-yl]-(4-methylpiperazin-1-yl)methanone into its molecular formula.
user
C21H28N6OS
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