Using COCc1nc2c(OC)c3c(=O)n(C)c(COC)nc3c(OC)c2c(=O)n1C to produce Cn1c(CO)nc2c(O)c3c(=O)n(C)c(CO)nc3c(O)c2c1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.