ERROR opening https://cactus.nci.nih.gov/chemical/structure/c1ccc%28cc1%29C%28%3DO%29O%5BHg%5DOC%28%3DO%29c2ccccc2.O/file?format=sdf&get3d=True  -- c1ccc%28cc1%29C%28%3DO%29O%5BHg%5DOC%28%3DO%29c2ccccc2.O could not be loaded.