ERROR opening https://cactus.nci.nih.gov/chemical/structure/c1%28C%28NCC%28O%29%3DO%29%3DO%29ccc%28N%29cc1/file?format=sdf&get3d=True  -- c1%28C%28NCC%28O%29%3DO%29%3DO%29ccc%28N%29cc1 could not be loaded.