Using COc1ccc2c(COCc3ccccc3)nnc(NC3CCN(Cc4ccc5ccccc5c4)CC3)c2c1 to produce COc1ccc2c(CO)nnc(NC3CCN(Cc4ccc5ccccc5c4)CC3)c2c1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.