ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI%3DInChI%3D1S/C16H20N2/c1-18%282%2913-11-15%2814-8-4-3-5-9-14%2916-10-6-7-12-17-16/h3-10%2C12%2C15H%2C11%2C13H2%2C1-2H3/file?format=sdf&get3d=True  -- InChI%3DInChI%3D1S/C16H20N2/c1-18%282%2913-11-15%2814-8-4-3-5-9-14%2916-10-6-7-12-17-16/h3-10%2C12%2C15H%2C11%2C13H2%2C1-2H3 could not be loaded.