You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance 4-[(E)-[[2,6-di(piperidin-1-yl)pyrimidin-4-yl]hydrazinylidene]methyl]benzene-1,2-diol .
user
C21H28N6O2
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