You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (1R,2S,5R,7R,11R,12S,13R)-2,6,6,13-tetramethyltetracyclo[10.3.1.01,10.02,7]hexadec-9-ene-5,11,13-triol by IUPAC nomenclature, provide its molecular formula.
user
C20H32O3
assistant