You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the SMILES representation for 1-[4-(4-nitro-3-piperidin-1-ylphenyl)piperazin-1-yl]butan-1-one ?
user
CCCC(=O)N1CCN(C2=CC=C([N+](=O)[O-])C(N3CCCCC3)=C2)CC1
assistant