You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[2-(2,4-dicarbamimidoylphenyl)ethyl]-2-[5-(3,4-dichlorophenyl)sulfonyl-6H-phenanthridin-6-yl]acetamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C31H28Cl2N6O3S
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