ERROR opening https://cactus.nci.nih.gov/chemical/structure/C%3DP%28C1%3DCC%3DCC%3DC1%29%28C2%3DCC%3DCC%3DC2%29C3%3DCC%3DCC%3DC3/file?format=sdf&get3d=True  -- C%3DP%28C1%3DCC%3DCC%3DC1%29%28C2%3DCC%3DCC%3DC2%29C3%3DCC%3DCC%3DC3 could not be loaded.