ERROR opening https://cactus.nci.nih.gov/chemical/structure/c6c3ccc2cc1cccc5c1c4c2c3c%28cc4cc5%29cc6/file?format=sdf&get3d=True  -- c6c3ccc2cc1cccc5c1c4c2c3c%28cc4cc5%29cc6 could not be loaded.