Using COC(=O)CCCn1ccc2cc(-c3nc4ccc(C5(c6ccccc6)CC5)nc4s3)ccc21 to produce O=C(O)CCCn1ccc2cc(-c3nc4ccc(C5(c6ccccc6)CC5)nc4s3)ccc21, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.