ERROR opening https://cactus.nci.nih.gov/chemical/structure/C%23%5BNH%2B%5D%2C%20%5BNH%2B%5D%23C/file?format=sdf&get3d=True  -- C%23%5BNH%2B%5D%2C%20%5BNH%2B%5D%23C could not be loaded.