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