ERROR opening https://cactus.nci.nih.gov/chemical/structure/n1c%28onc1CC%28c2ccccc2%29c3ccccc3%29CCN4CCCCC4/file?format=sdf&get3d=True  -- n1c%28onc1CC%28c2ccccc2%29c3ccccc3%29CCN4CCCCC4 could not be loaded.