You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Under IUPAC nomenclature, a molecule named 2-[(1S,3aR,7aR)-5-(5-methylthiadiazole-4-carbonyl)-3,3a,4,6,7,7a-hexahydro-1H-furo[3,4-c]pyridin-1-yl]-1-piperidin-1-ylethanone is given. What is its corresponding molecular formula?
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C18H26N4O3S
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