Using N#CCCN(CCC#N)CCCN(CCCN(CCC#N)CCC#N)Cc1ccccc1 to produce NCCCN(CCCN)CCCN(CCCN(CCCN)CCCN)Cc1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.