You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name (1S,3R,7S,9R,12S,13R)-13-[(Z)-but-2-en-2-yl]-13-methoxy-3,7,12-trimethyl-10,14,16-trioxatetracyclo[7.5.1.13,6.012,15]hexadec-5-ene-4,11-dione into its molecular formula.
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C21H28O6
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