You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name N-(3-bromo-6-phenylimidazo[1,2-a]pyrazin-8-yl)acetamide;N-(6-phenylimidazo[1,2-a]pyrazin-8-yl)acetamide into its molecular formula.
user
C28H23BrN8O2
assistant