ERROR opening https://cactus.nci.nih.gov/chemical/structure/%5BN%2B%5D%28%3DO%29%28%5BO-%5D%29O%5BHg%5D.%5BN%2B%5D%28%3DO%29%28%5BO-%5D%29O%5BHg%5D.O.O/file?format=sdf&get3d=True  -- %5BN%2B%5D%28%3DO%29%28%5BO-%5D%29O%5BHg%5D.%5BN%2B%5D%28%3DO%29%28%5BO-%5D%29O%5BHg%5D.O.O could not be loaded.