You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name [2-cyano-2-[(2R,3R,4R)-5-cyano-2-hydroxy-2,4-diphenyl-3-pyridin-1-ium-1-yl-3,4-dihydro-1H-pyridin-6-yl]ethenylidene]azanide into its molecular formula.
user
C26H19N5O
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