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-[5-(methanesulfonamido)-2-methylphenyl]-1-methyl-1-[(5-methyl-1,2-oxazol-3-yl)methyl]urea into molecular formula.
user
C15H20N4O4S
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