You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the molecule identified by 2,6-dichloro-3-[2-(2-morpholin-4-ylethylcarbamoylamino)-3H-benzimidazol-5-yl]benzenesulfonic acid ?
user
C20H21Cl2N5O5S
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