Using COC(=O)CCCC(NCc1cnc2ccccc2c1)c1c(OC)cccc1OC to produce COc1cccc(OC)c1C(CCCC(=O)O)NCc1cnc2ccccc2c1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.