ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI%3DInChI%3D1S/C13H14N4O/c18-13%2816-14-11-7-3-1-4-8-11%2917-15-12-9-5-2-6-10-12/h1-10%2C14-15H%2C%28H2%2C16%2C17%2C18%29/file?format=sdf&get3d=True -- InChI%3DInChI%3D1S/C13H14N4O/c18-13%2816-14-11-7-3-1-4-8-11%2917-15-12-9-5-2-6-10-12/h1-10%2C14-15H%2C%28H2%2C16%2C17%2C18%29 could not be loaded.