Using OCc1ccc2[nH]c(-c3n[nH]c4ccccc34)cc2c1 to produce O=Cc1ccc2[nH]c(-c3n[nH]c4ccccc34)cc2c1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.