ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC%28C%28%3DO%29C1%3DCC2%3DC%28C%3DC1%29OCO2%29NCC3%3DCC%3DCC%3DC3/file?format=sdf&get3d=True -- CC%28C%28%3DO%29C1%3DCC2%3DC%28C%3DC1%29OCO2%29NCC3%3DCC%3DCC%3DC3 could not be loaded.