Using CCOCC, CCC(=O)c1cc(C)nn2c(-c3sc(-c4cccc(C)n4)cc3C)c(C)nc12 to produce CCC(O)(CC)c1cc(C)nn2c(-c3sc(-c4cccc(C)n4)cc3C)c(C)nc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.