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 (4R)-16-chloro-17,19-dihydroxy-4-propyl-3,7-dioxatricyclo[13.4.0.06,8]nonadeca-1(15),11,16,18-tetraene-2,13-dione .
user
C20H23ClO6
assistant