ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC1%28C2CCC%28C2%29%28C1%26%2361%3BO%29C%29C/file?format=sdf&get3d=True  -- CC1%28C2CCC%28C2%29%28C1%26%2361%3BO%29C%29C could not be loaded.