You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named N-(cyclopropylmethyl)-2-[[4-[(4-methylphenyl)methyl]piperazin-1-yl]methyl]-1,3-oxazole-4-carboxamide by IUPAC nomenclature, provide its molecular formula.
user
C21H28N4O2
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