ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC1%26%2361%3BCC%28%26%2361%3BO%29C2CC1C2%28C%29C/file?format=sdf&get3d=True -- CC1%26%2361%3BCC%28%26%2361%3BO%29C2CC1C2%28C%29C could not be loaded.