You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (Z)-3-(4-hydroxyphenyl)-2-(4-hydroxy-2-sulfanylphenyl)-1-(4-propoxyphenyl)but-2-en-1-one by IUPAC nomenclature, provide its molecular formula.
user
C25H24O4S
assistant