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 1-ethyl-2-[2-[(2S,4S)-4-methyl-1-[(2R)-pyrrolidine-2-carbonyl]pyrrolidin-2-yl]ethyl]indole-6-carbonitrile .
user
C23H30N4O
assistant