Annelated calix[4]arenes, a new type of oligomeric calixarenes
Volker Bo¨hmera, Ralph Do¨rrenba¨chera, Walter Vogta and Lucia Zetta
Tetrahedron Letters, Volume 33, Issue 6, 4 February 1992, Pages 769-772
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http://dx.doi.org/10.1016/S0040-4039(00)77711-2