You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(1S,3R,5R,8Z,12R,13R)-12-hydroxy-5,13-dimethyl-1-propan-2-yl-4,16-dioxatricyclo[11.2.1.03,5]hexadec-8-ene-9-carbaldehyde The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H32O4
assistant