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