Using O=C1CCC(N2CCC3(CC2)OC(=O)Nc2ccccc23)CC1, CCON to produce CCON=C1CCC(N2CCC3(CC2)OC(=O)Nc2ccccc23)CC1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.