Using COCCOCc1csc2c(=O)c(C(=O)NCc3ccc(Cl)cc3)cn(C)c12, C1CCOC1 to produce COCCOCc1c(C=O)sc2c(=O)c(C(=O)NCc3ccc(Cl)cc3)cn(C)c12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.