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 N-[(3-fluorophenyl)methyl]-2-[6-(4-methoxyphenyl)-2,5-dioxo-7H-imidazo[1,5-b][1,2,4]triazol-3-yl]acetamide .
user
C20H18FN5O4
assistant