ERROR opening https://cactus.nci.nih.gov/chemical/structure/F%5BAg%5D%28%5BNH3%5D%29%5BNH3%5D/file?format=sdf&get3d=True  -- F%5BAg%5D%28%5BNH3%5D%29%5BNH3%5D could not be loaded.