ERROR opening https://cactus.nci.nih.gov/chemical/structure/c4cccc2c4c%28CC%29ccc2C%28%3DO%29c%28c3%29c1ccccc1n3CCCCC/file?format=sdf&get3d=True -- c4cccc2c4c%28CC%29ccc2C%28%3DO%29c%28c3%29c1ccccc1n3CCCCC could not be loaded.