Using O=C(OCc1ccccc1)c1cc(OCc2ccccc2)c(OCc2ccccc2)cn1 to produce O=C(O)c1cc(OCc2ccccc2)c(OCc2ccccc2)cn1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.