ERROR opening https://cactus.nci.nih.gov/chemical/structure/COc3ccc2c1CCN%3DC%28C%29c1%5BnH%5Dc2c3/file?format=sdf&get3d=True  -- COc3ccc2c1CCN%3DC%28C%29c1%5BnH%5Dc2c3 could not be loaded.