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