You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Name the molecular formula for the molecule established as 3-[6-[(3aR,7aR)-3a,4,5,6,7,7a-hexahydro-1H-benzimidazol-2-yl]-1H-benzimidazol-2-yl]phenol using the IUPAC nomenclature.
user
C20H20N4O
assistant