You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule 2-[6-(3-ethyl-4-methoxyphenyl)-3-oxo-1,2-dihydroinden-2-yl]-N-[(5-methylpyrazin-2-yl)methyl]acetamide .
user
C26H27N3O3
assistant