ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC2%3DC%28C%28NC1%3DCC%3DCC%3DC1%29%3DO%29SCCO2/file?format=sdf&get3d=True  -- CC2%3DC%28C%28NC1%3DCC%3DCC%3DC1%29%3DO%29SCCO2 could not be loaded.