ERROR opening https://cactus.nci.nih.gov/chemical/structure/FC%28F%29%28F%29c2ccc%28OC%28CCNC%29c1ccccc1%29cc2/file?format=sdf&get3d=True  -- FC%28F%29%28F%29c2ccc%28OC%28CCNC%29c1ccccc1%29cc2 could not be loaded.