ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC%28O%29CCc1nc%28c%28o1%29c2ccccc2%29c3ccccc3/file?format=sdf&get3d=True  -- O%3DC%28O%29CCc1nc%28c%28o1%29c2ccccc2%29c3ccccc3 could not be loaded.