Crystal structure of 5,11,17,23-tetra-tert-butyl-25,26-bis (diphenyl-phosphinoylmethoxy)-27,28-bis(benzoylmethoxy)calix[4]arene–ethyl acetate–hexane (1:1:0.5), C 86 H 90 O 8 P 2 ·C 4 H 8 O 2 ·0.5C 6 H 14 , a new cavity-shaped ligand with eight oxygen donors
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