A [2]catenane made to order
A [2]catenane made to order, (P. R. Ashton, T. T. Goodnow, A. E. Kaifer, M. V. Reddington, A. M. Z. Slawin, N. Spencer, J. F. Stoddart, C. Vicent, and D. J. Williams), Angew. Chem. Int. Ed. Engl. 1989, 28, 1396-1399.