24-Methyl-20,28-dioxa-3,14-diazapentacyclo[27.2.2.2~4,7~.2~10,13~.2~16,19~]nonatriaconta-1(31),2,4,6,10,12,14,16,18,29,32,34,36,38-tetradecaene AIDS-153266 AIDS153266 NSC699723