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,2S,6S,7S,9R,11R,12R,16S)-11-hydroxy-4,14-dimethoxy-2,6,13,16-tetramethyl-10-oxatetracyclo[7.6.1.02,7.012,16]hexadeca-4,13-diene-3,15-dione .
user
C21H28O6
assistant