You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (1R,4R,9R,10S,13R)-5-(hydroxymethyl)-5,9-dimethyl-14-methylidenetetracyclo[11.2.1.01,10.04,9]hexadecan-6-ol by IUPAC nomenclature, provide its molecular formula.
user
C20H32O2
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