ERROR opening https://cactus.nci.nih.gov/chemical/structure/C1CN%28C1C%28%3DO%29O%29CCC%28C%28%3DO%29O%29NCCC%28C%28%3DO%29O%29N/file?format=sdf&get3d=True -- C1CN%28C1C%28%3DO%29O%29CCC%28C%28%3DO%29O%29NCCC%28C%28%3DO%29O%29N could not be loaded.