ERROR opening https://cactus.nci.nih.gov/chemical/structure/n1cc%28c2c%28c1%29%5BC%40H%5D%28CC2%29C%29C/file?format=sdf&get3d=True  -- n1cc%28c2c%28c1%29%5BC%40H%5D%28CC2%29C%29C could not be loaded.