You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-hydroxy-4-[[3-[3-(piperazin-1-ylmethyl)phenyl]phenyl]methylamino]pyrido[2,3-d]pyrimidin-2-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C25H26N6O2
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