ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DCc1c%28O%29c%28C%29ncc1COP%28O%29%28O%29%3DO/file?format=sdf&get3d=True  -- O%3DCc1c%28O%29c%28C%29ncc1COP%28O%29%28O%29%3DO could not be loaded.