You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-(7-cyclobutyl-8-methyl-6,8-dihydro-5H-imidazo[1,2-a]pyrazin-2-yl)-N-[(5-methylpyrazin-2-yl)methyl]acetamide;2,2,2-trifluoroacetic acid is the IUPAC name of a molecule. Please give its molecular formula.
user
C21H27F3N6O3
assistant