You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 5-(2-methylsulfonyl-3,4-dihydro-1H-isoquinolin-6-yl)-3-(piperidin-4-ylmethyl)-1,2,4-oxadiazole;dihydrochloride into its molecular formula.
user
C18H26Cl2N4O3S
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