Using O=C(c1ccccc1)c1cn2c3ccccc3c3cccc(c1=O)c32 to produce O=c1c(C(O)c2ccccc2)cn2c3ccccc3c3cccc1c32, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.