ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC1%3DNC%3DCC2%3DC1NC3%3DCC%3DCC%3DC23/file?format=sdf&get3d=True  -- CC1%3DNC%3DCC2%3DC1NC3%3DCC%3DCC%3DC23 could not be loaded.