ERROR opening https://cactus.nci.nih.gov/chemical/structure/C%28c1c%5BnH%5Dc2ccccc12%29c3c%5BnH%5Dc4ccccc34/file?format=sdf&get3d=True  -- C%28c1c%5BnH%5Dc2ccccc12%29c3c%5BnH%5Dc4ccccc34 could not be loaded.