ERROR opening https://cactus.nci.nih.gov/chemical/structure/CNCCC%3DC1C2%3DCC%3DCC%3DC2CCC3%3DCC%3DCC%3DC31/file?format=sdf&get3d=True  -- CNCCC%3DC1C2%3DCC%3DCC%3DC2CCC3%3DCC%3DCC%3DC31 could not be loaded.