You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 6-azaspiro[2.5]octan-2-yl-[4-[(3,5-dimethyl-1,2-oxazol-4-yl)sulfonyl]-1,4-diazepan-1-yl]methanone;hydrochloride by IUPAC nomenclature, provide its molecular formula.
user
C18H29ClN4O4S
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