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2B. Genorio, J. Kobe, G. Giester and I. Leban.
Cone and 1,3-alternate conformers of 1,3-bis(ethoxycarbonylmethoxy)-2,4-dihydroxycalix[4]arene and 1,2,3,4-tetrakis(ethoxycarbonylmethoxy)calix[4]arene, Acta Cryst. (2003). C59, o221-o224Â Â Â Â