Using CCCCCCCCCCCCCCCCNc1csc(C(=O)O)c1, CCOCCO to produce CCCCCCCCCCCCCCCCNc1csc(C(=O)OCCOCC)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.