2,4,6-Tris(hydroxy(oxido)amino)phenol compound with 6,7-dihydro-5lambda~5~-[1,3]dioxolo[4,5-g][1,3]dioxolo[4',5':7,8]isoquino[3,2-a]isoquinoline (1:1) AIDS-157613 AIDS157613 Coptisine picrate NSC646659