ERROR opening https://cactus.nci.nih.gov/chemical/structure/CCN%28CC%29CCS%5BP%40%40%5D%28%3DO%29%28C%29OC1CCCC1/file?format=sdf&get3d=True -- CCN%28CC%29CCS%5BP%40%40%5D%28%3DO%29%28C%29OC1CCCC1 could not be loaded.