Using CCC(CC)c1cc(C)nn2c(-c3c(C)nc4c(C=O)cccn34)c(C)nc12 to produce CCC(CC)c1cc(C)nn2c(-c3c(C)nc4c(CO)cccn34)c(C)nc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.