You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name [(2S,3R,7R,9S,10R)-4-methyl-12-oxo-11,16,18-trioxa-4-azapentacyclo[11.7.0.02,10.03,7.015,19]icosa-1(20),13,15(19)-trien-9-yl] (3S)-3-hydroxybutanoate into its molecular formula.
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C21H25NO7
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