ERROR opening https://cactus.nci.nih.gov/chemical/structure/OC1C%3DCC2%3DC%28C%3D1%29CCC3C2CCC4C3%3DCC%3DC%28O%29C%3D4/file?format=sdf&get3d=True -- OC1C%3DCC2%3DC%28C%3D1%29CCC3C2CCC4C3%3DCC%3DC%28O%29C%3D4 could not be loaded.