You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Under IUPAC nomenclature, a molecule named [(2S,3R,4S,5S,6R)-2-[5,7-dihydroxy-2-[3-hydroxy-4-[(E)-2-propanoyloxyethenoxy]phenyl]-4-oxochromen-3-yl]oxy-4,5-dihydroxy-6-(hydroxymethyl)oxan-3-yl] 3,4,5-trihydroxybenzoate is given. What is its corresponding molecular formula?
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C33H30O18
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