You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 1-[[(3aR,7aR)-3a,4,5,6,7,7a-hexahydro-1H-benzimidazol-2-yl]carbamoyl]-1-(4-chlorophenyl)-3-[(4-chlorophenyl)carbamoyl]urea by IUPAC nomenclature, provide its molecular formula.
user
C22H22Cl2N6O3
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