ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC%28c1ccccc1COc2ccc%28cc2%29CC%29Nc3ccc4nc%28cc%28c4c3%29N%29C/file?format=sdf&get3d=True  -- O%3DC%28c1ccccc1COc2ccc%28cc2%29CC%29Nc3ccc4nc%28cc%28c4c3%29N%29C could not be loaded.