You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name (1S,6S,9S,10S)-10-hydroxy-2,2,10-trimethyl-8-oxatricyclo[7.3.1.01,6]tridec-11-ene-4,7-dione into its molecular formula.
user
C15H20O4
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