You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance 8-(2,5-dimethylthiophen-3-yl)sulfonyl-2-methyl-3,4-dihydro-1H-pyrrolo[3,2-g][1,4]benzoxazepine .
user
C18H20N2O3S2
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