ERROR opening https://cactus.nci.nih.gov/chemical/structure/C%23%26%2391%3BC-%26%2393%3B.%26%2391%3BNa%2B%26%2393%3B/file?format=sdf&get3d=True -- C%23%26%2391%3BC-%26%2393%3B.%26%2391%3BNa%2B%26%2393%3B could not be loaded.