ERROR opening https://cactus.nci.nih.gov/chemical/structure/OC%3D1c4ccccc4OC%28%3DO%29C%3D1C3CCCc2ccccc23/file?format=sdf&get3d=True  -- OC%3D1c4ccccc4OC%28%3DO%29C%3D1C3CCCc2ccccc23 could not be loaded.