You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named methyl 3-[[(1R,4S,5R,8S,9R,12R,13R)-1,5,9-trimethyl-11,14,15,16-tetraoxatetracyclo[10.3.1.04,13.08,13]hexadecan-10-yl]oxy]-1,2-oxazole-5-carboxylate by IUPAC nomenclature, provide its molecular formula.
user
C20H27NO8
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