ERROR opening https://cactus.nci.nih.gov/chemical/structure/NCCc1c%5BnH%5Dc2c%28O%29cc%28O%29cc12/file?format=sdf&get3d=True  -- NCCc1c%5BnH%5Dc2c%28O%29cc%28O%29cc12 could not be loaded.