You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance 2-chloro-N-[(1S)-1-(4-morpholin-4-ylphenyl)ethyl]imidazo[1,2-a]pyridine-3-carboxamide .
user
C20H21ClN4O2
assistant