Using C=CCc1cc(-c2csc(-c3ccc(OCC)c(OCC)c3)n2)cc(C(=O)O)c1O to produce CCCc1cc(-c2csc(-c3ccc(OCC)c(OCC)c3)n2)cc(C(=O)O)c1O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.