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 6-bromo-2-[(Z)-1-chloro-2-phenylethenyl]-N-cyclopentylimidazo[1,2-a]pyridin-3-amine ?
user
C20H19BrClN3
assistant