ERROR opening https://cactus.nci.nih.gov/chemical/structure/COC1%3DC%28NC%28%3DC1%29C2%3DCC%3DCN2%29C%3DO/file?format=sdf&get3d=True  -- COC1%3DC%28NC%28%3DC1%29C2%3DCC%3DCN2%29C%3DO could not be loaded.