You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
7-[[4-[[4-[(6,8-disulfonaphthalen-2-yl)diazenyl]phenyl]carbamoylamino]phenyl]diazenyl]naphthalene-1,3-disulfonic acid is the IUPAC name of a molecule. Please give its molecular formula.
user
C33H24N6O13S4
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