You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (4R,5R,9S,12S)-16-(2-hydroxypropan-2-yl)-5,9-dimethyl-13,14-dioxatetracyclo[10.2.2.01,10.04,9]hexadec-15-ene-5-carboxylic acid by IUPAC nomenclature, provide its molecular formula.
user
C20H30O5
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