You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[(10R,11R,12R,13S,15R)-13-[3,5-dihydroxy-4-[3-(3-hydroxyphenyl)propanoyl]phenoxy]-3,4,5,12,21,22,23-heptahydroxy-8,18-dioxo-9,14,17-trioxatetracyclo[17.4.0.02,7.010,15]tricosa-1(23),2,4,6,19,21-hexaen-11-yl] 3,4,5-trihydroxybenzoate is the IUPAC name of a molecule. Please give its molecular formula.
user
C42H34O22
assistant