Using O=C1CC[C@@H](C(=O)N2CSCC2C(=O)O)N1, C1COCCN1 to produce O=C1CC[C@@H](C(=O)N2CSCC2C(=O)N2CCOCC2)N1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.