You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the molecule identified by (2S)-2-[4-(2-methyl-1H-pyrrole-3-carbonyl)piperazin-1-yl]-1-pyrrolidin-1-ylpropan-1-one ?
user
C17H26N4O2
assistant