2,2',2'',2'''-((5,11,17,23-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-25,26,27,28-tetrayl)tetrakis(oxy))tetrakisacetic
acid tetraethyl ester stereoisomer compd. with sodium perchlorate (1:1)