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 [(1R,8R,11R,13S,17R,18R,19S)-13-hydroxy-14,14,18-trimethyl-9-oxo-4,10-dioxapentacyclo[9.7.1.03,7.08,19.013,18]nonadeca-3(7),5-dien-17-yl] acetate .
user
C22H28O6
assistant