You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
methyl 4'-[1-[3-[3-hydroxy-4-[3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyphenyl]prop-2-enoyloxy]ethyl]-5'-oxo-1-[3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyspiro[4a,7a-dihydro-1H-cyclopenta[c]pyran-7,2'-furan]-4-carboxylate is the IUPAC name of a molecule. Please give its molecular formula.
user
C36H42O20
assistant