You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Under IUPAC nomenclature, a molecule named N-(4-phenoxyphenyl)-5,6,7,8-tetrahydroimidazo[1,2-a]pyridine-7-carboxamide is given. What is its corresponding molecular formula?
user
C20H19N3O2
assistant