ERROR opening https://cactus.nci.nih.gov/chemical/structure/c3cc%28OC%29cc1c3%5BnH%5Dcc1C%3D2CCNCC%3D2/file?format=sdf&get3d=True  -- c3cc%28OC%29cc1c3%5BnH%5Dcc1C%3D2CCNCC%3D2 could not be loaded.