ERROR opening https://cactus.nci.nih.gov/chemical/structure/Nc1cc%28nc%28N%29%5Bn%2B%5D1%5BO-%5D%29N2CCCCC2/file?format=sdf&get3d=True  -- Nc1cc%28nc%28N%29%5Bn%2B%5D1%5BO-%5D%29N2CCCCC2 could not be loaded.