Using COCC#CC(=O)c1sc(NC(=O)OC(C)(C)C)nc1-c1ccco1 to produce COCCCC(=O)c1sc(NC(=O)OC(C)(C)C)nc1-c1ccco1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.