ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI%3DInChI%3D1S/C6H11N/c1-3-5-7-6-4-2/h3-4%2C7H%2C1-2%2C5-6H2/file?format=sdf&get3d=True  -- InChI%3DInChI%3D1S/C6H11N/c1-3-5-7-6-4-2/h3-4%2C7H%2C1-2%2C5-6H2 could not be loaded.