Using O, Cc1c(C)n(Cc2ccccc2)c2c(N3CCc4ccccc4C3)cncc12 to produce Cc1c(CO)c2cncc(N3CCc4ccccc4C3)c2n1Cc1ccccc1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.