Using CC(=O)OC(C)=O, Nc1nc(C(=NOC2CCCCC2)C(=O)O)cs1 to produce O=CNc1nc(C(=NOC2CCCCC2)C(=O)O)cs1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.