ERROR opening https://cactus.nci.nih.gov/chemical/structure/C1CN2C%28%3DNC3%3DCC%3DCC%3DC3C2%3DO%29%5BC%40H%5D1O/file?format=sdf&get3d=True  -- C1CN2C%28%3DNC3%3DCC%3DCC%3DC3C2%3DO%29%5BC%40H%5D1O could not be loaded.