ERROR opening https://cactus.nci.nih.gov/chemical/structure/c1ccc%28cc1%29c2c3ccccc3cc%28n2%29N4CCNCC4/file?format=sdf&get3d=True  -- c1ccc%28cc1%29c2c3ccccc3cc%28n2%29N4CCNCC4 could not be loaded.