You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
7-(1,3-dihydroisoindole-2-carbonyl)-8-(methoxymethyl)-1-(oxan-4-yl)-5H-imidazo[1,5-a]quinoxalin-4-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C26H26N4O4
assistant