You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule 4-[4-(4-chlorophenyl)-1-(2-phenylethyl)-5-pyrimidin-4-ylimidazol-2-yl]but-3-ynyl methyl carbonate into molecular formula.
user
C27H23ClN4O3
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