Using COc1ccc(Sc2[nH]c(-c3ccccc3)cn3c(=O)c(Cc4ccccc4)nc2-3)cc1, CC(=O)Cl to produce COc1ccc(Sc2nc(-c3ccccc3)cn3c(OC(C)=O)c(Cc4ccccc4)nc23)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.