You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule 2-(3-hydroxyphenyl)-1-[(1S,5R)-3-(pyrazine-2-carbonyl)-3,6-diazabicyclo[3.2.2]nonan-6-yl]ethanone ?
user
C20H22N4O3
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