ERROR opening https://cactus.nci.nih.gov/chemical/structure/C1CN%28CCC12CNC%28%3DO%29O2%29CCC3%3DCC%3DCC%3DC3/file?format=sdf&get3d=True  -- C1CN%28CCC12CNC%28%3DO%29O2%29CCC3%3DCC%3DCC%3DC3 could not be loaded.