ERROR opening https://cactus.nci.nih.gov/chemical/structure/%5BcH-%5D1cccc1.%5BcH-%5D1cccc1.%5BMg%2B2%5D/file?format=sdf&get3d=True  -- %5BcH-%5D1cccc1.%5BcH-%5D1cccc1.%5BMg%2B2%5D could not be loaded.