You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule (1S,2R,6S,7R,14S,15S)-6-(3,4-dihydroxyphenyl)-1-methyl-5,13,17,18-tetraoxapentacyclo[13.2.1.02,14.03,12.04,9]octadeca-3(12),4(9),10-triene-2,7,10,14-tetrol .
user
C21H20O10
assistant