You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named diethyl-[2-[(13-methyl-16-thia-2,3,4,5,7-pentaza-13-azoniatetracyclo[7.7.0.02,6.010,15]hexadeca-1(9),3,5,7,10(15)-pentaen-8-yl)amino]ethyl]azanium by IUPAC nomenclature, provide its molecular formula.
user
C16H26N8S+2
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