You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule (3R,4R,5Z,9R,11Z,13R,14R)-14-ethyl-4,10-dihydroxy-3,5,9,11,13-pentamethyl-1-oxacyclotetradeca-5,11-diene-2,7-dione into molecular formula.
user
C20H32O5
assistant