You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name [13-methyl-2-(1-methylpiperidin-4-ylidene)-4-azatricyclo[9.4.0.03,8]pentadeca-1(11),3(8),4,6,12,14-hexaen-5-yl] hydrogen sulfate into its molecular formula.
user
C21H24N2O4S
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