You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named 1-methyl-3-[(1-phenylcyclopropyl)methyl]-1-[(2R)-2-(1,3-thiazol-2-yl)propyl]urea by IUPAC nomenclature, provide its molecular formula.
user
C18H23N3OS
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