Using C1CCNC1, CN1Cc2c(C=O)ccc(NC(=O)OC(C)(C)C)c2C1=O to produce CN1Cc2c(CN3CCCC3)ccc(NC(=O)OC(C)(C)C)c2C1=O, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.