ERROR opening https://cactus.nci.nih.gov/chemical/structure/C1CN%5BC%40%40H%5D1COC2%3DCN%3DCC%3DC2/file?format=sdf&get3d=True  -- C1CN%5BC%40%40H%5D1COC2%3DCN%3DCC%3DC2 could not be loaded.