You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule (E)-N-(5,7-diphenyl-[1,2,4]triazolo[1,5-a]pyrimidin-2-yl)-3-(2-methoxyphenyl)prop-2-enamide .
user
C27H21N5O2
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