You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance 1-(7-ethyl-3-methylspiro[5,6-dihydroimidazo[1,2-a]pyrazine-8,4'-piperidine]-1'-yl)-2-(3-methoxyphenyl)ethanone .
user
C22H30N4O2
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