You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[7-[(2,4-dihydroxy-3,3-dimethylbutanoyl)amino]-4-oxoheptyl]-2,4-dihydroxy-3,3-dimethylbutanamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H36N2O7
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