ERROR opening https://cactus.nci.nih.gov/chemical/structure/C%26%2391%3BN%2B%26%2393%3B%28C%29%28C%29%26%2391%3BO-%26%2393%3B/file?format=sdf&get3d=True -- C%26%2391%3BN%2B%26%2393%3B%28C%29%28C%29%26%2391%3BO-%26%2393%3B could not be loaded.