ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI%3DInChI%3D1S/C6H12/c1-5-6%282%2C3%294/h5H%2C1H2%2C2-4H3/file?format=sdf&get3d=True  -- InChI%3DInChI%3D1S/C6H12/c1-5-6%282%2C3%294/h5H%2C1H2%2C2-4H3 could not be loaded.