You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
8-chloro-5-methyl-1-piperazin-4-ium-1-yl-5,6-dihydro-4H-[1,2,4]triazolo[4,3-a][1,4]benzodiazepin-5-ium The above is the IUPAC name of a molecule. Write its molecular formula.
user
C15H21ClN6+2
assistant