Using CCCOc1cc2c(c3c(=O)c(-c4ccc(OC)cc4)cn(CC(=O)OCC)c13)OCCC2 to produce CCCOc1cc2c(c3c(=O)c(-c4ccc(OC)cc4)cn(CC(=O)O)c13)OCCC2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.