Synonyms: Calixarene;Calixarenes;Acetic acid, 2,2',2'',2'''-((25,26,27,28-tetrakis(1,1-dimethylethyl)pentacyclo(19.3.1.1(3,7).1(9,13).1(15,19))octacosa-1(25),3,5,7(28),9,11,13(27),15,17,19(26),21,23-dodecaene-5,11,17,23-tetrayl)tetrakis(oxy))tetrakis-, tetramethyl ester;tetramethyl 2,2',2'',2'''-{[5,11,17,23-tetra-tert-butylpentacyclo[19.3.1.1~3,7~.1~9,13~.1~15,19~]octacosa-1(25),3(28),4,6,9(27),10,12,15(26),16,18,21,23-dodecaene-25,26,27,28-tetrayl]tetrakis(oxy)}tetraacetate