The issue focused on the solubility of C4.

J.P. Tredin, A.E. Wiese, T.D. Lark, T.C. Gage, T.C. Gage, and S.C. Gage, "Dissolved C4: A new class of Isotope-lattice n-bonded C4. " The journal of the American Chemical Society, vol. 84, no. 3, June