You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
methyl (3R)-3-(3-chloro-4-hydroxyphenyl)-3-(5,7-dihydroxy-4-oxo-2-phenylchromen-8-yl)propanoate is the IUPAC name of a molecule. Please give its molecular formula.
user
C25H19ClO7
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