You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the compound with this IUPAC name (1S)-N-(8-methyl-2-phenylimidazo[1,2-a]pyridin-3-yl)cyclohex-3-ene-1-carboxamide ?
user
C21H21N3O
assistant