J.M. Moldowan T.M. Peakman J.C. Clardy E. Lobkovsky M.M. Olmstead P.W. May T.J. Davis J.W. Steeds K. E. Peters A. Pepper A. Ekuan R.M.K. Carlson J.E.P. Dahl 2003 Ace of diamonds: Cyclohexamantane (C26H30), a large diamond-like molecule containing six peri-fused adamantane cages was identified in petroleum and its structure proven by X-ray crystallography (see picture), Never synthesized because of severe mechanistic difficulties, the structure of cyclohexamantane has appeared in theoretical molecular-simulation studies related to diamond; its experimentally determined properties are now discussed. application/pdf 10.1002/anie.200250794 en Isolation and structural proof of the large diamond molecule, cyclohexamantane (C26H30) article