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