ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/C21H16N4O/c1-26-19-7-6-15(21-20(19)13(8-9-22)11-25-21)16(10-23)17-12-24-18-5-3-2-4-14(17)18/h2-7,11-12,16,24-25H,8H2,1H3/t16-/m1/s1/file?format=sdf&get3d=True  -- InChI=1S/C21H16N4O/c1-26-19-7-6-15(21-20(19)13(8-9-22)11-25-21)16(10-23)17-12-24-18-5-3-2-4-14(17)18/h2-7,11-12,16,24-25H,8H2,1H3/t16-/m1/s1 could not be loaded.