You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule 2-[[1-cyclohexyl-2-[(5S)-5H-imidazo[5,1-a]isoindol-5-yl]ethyl]amino]ethanesulfonamide ?
user
C20H28N4O2S
assistant