Using Cc1c2c(cc3c(=O)c4ccccc4oc13)CC(CO)O2, CC(C)=O to produce Cc1c2c(cc3c(=O)c4ccccc4oc13)CC(C(=O)O)O2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.