ERROR opening https://cactus.nci.nih.gov/chemical/structure/CNCCC%5BC%40%5D12CC%5BC%40H%5D%28c3ccccc31%29c1ccccc12/file?format=sdf&get3d=True  -- CNCCC%5BC%40%5D12CC%5BC%40H%5D%28c3ccccc31%29c1ccccc12 could not be loaded.