ERROR opening https://cactus.nci.nih.gov/chemical/structure/Nc2nc%28%3DS%29c1%5BnH%5Dcnc1%5BnH%5D2/file?format=sdf&get3d=True  -- Nc2nc%28%3DS%29c1%5BnH%5Dcnc1%5BnH%5D2 could not be loaded.