ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI%3DInChI%3D1S/C20H14N4/c1-2-14-10-16-5-6-18%2823-16%2912-20-8-7-19%2824-20%2911-17-4-3-15%2822-17%299-13%281%2921-14/h1-12%2C21-22H/file?format=sdf&get3d=True -- InChI%3DInChI%3D1S/C20H14N4/c1-2-14-10-16-5-6-18%2823-16%2912-20-8-7-19%2824-20%2911-17-4-3-15%2822-17%299-13%281%2921-14/h1-12%2C21-22H could not be loaded.