You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name [7-[6-(2-formylphosphanyl-1H-imidazol-5-yl)-1-benzothiophen-2-yl]-10,11-dihydro-1H-naphtho[2,1-e]benzimidazol-2-yl]phosphanylformaldehyde into its molecular formula.
user
C28H20N4O2P2S
assistant