You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule 3-[(1R,2R,4S)-2-bicyclo[2.2.1]heptanyl]-1-[(3,5-dimethyl-1,2-oxazol-4-yl)methyl]-1-phenylthiourea into molecular formula.
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C20H25N3OS
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