You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule 2-methoxy-N-[8-methoxy-2-(1-methyl-2-oxabicyclo[2.1.1]hexan-4-yl)imidazo[1,2-a]pyrazin-6-yl]pyridine-3-carboxamide .
user
C20H21N5O4
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