5,11,17,23-Tetrakis(1,1,3,3-tetramethylbutyl)pentacyclo[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-tetrol AIDS-135214 AIDS135214 NSC634595