You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
8-benzyl-6-[2-(4-hydroxyphenyl)ethynyl]-2-[(4-hydroxyphenyl)methyl]imidazo[1,2-a]pyrazin-3-ol The above is the IUPAC name of a molecule. Write its molecular formula.
user
C28H21N3O3
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