ERROR opening https://cactus.nci.nih.gov/chemical/structure/c1cc2cc3cccc4c3c-5c2c%28c1%29%5BCH%5Dc6c5c%28ccc6%29%5BCH%5D4/file?format=sdf&get3d=True  -- c1cc2cc3cccc4c3c-5c2c%28c1%29%5BCH%5Dc6c5c%28ccc6%29%5BCH%5D4 could not be loaded.