23-Methyl-20,26-dioxa-3,14-diazapentacyclo[25.2.2.2~4,7~.2~10,13~.2~16,19~]heptatriaconta-1(29),2,4,6,10,12,14,16,18,27,30,32,34,36-tetradecaene AIDS-153264 AIDS153264 NSC699721