ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC%28C%29%28NC%28%3DO%29c3nn%28CC1CCC1%29c2ccccc23%29c4ccccc4/file?format=sdf&get3d=True -- CC%28C%29%28NC%28%3DO%29c3nn%28CC1CCC1%29c2ccccc23%29c4ccccc4 could not be loaded.