ERROR opening https://cactus.nci.nih.gov/chemical/structure/OC%3D1c3ccccc3OC%28%3DO%29C%3D1C%28CC%29c2ccccc2/file?format=sdf&get3d=True  -- OC%3D1c3ccccc3OC%28%3DO%29C%3D1C%28CC%29c2ccccc2 could not be loaded.