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 (8R)-7-(2-cyclopropylacetyl)-8-methyl-N-(pyridin-2-ylmethyl)-6,8-dihydro-5H-imidazo[1,2-a]pyrazine-2-carboxamide ?
user
C19H23N5O2
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