You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-(3H-benzimidazole-5-carbonyl)-2,3,4a,5,6,10b-hexahydro-1H-benzo[f]quinoline-10-carbonitrile;molecular hydrogen The above is the IUPAC name of a molecule. Write its molecular formula.
user
C22H22N4O
assistant