ERROR opening https://cactus.nci.nih.gov/chemical/structure/CN%28C%29C%5BC%40%40H%5D2CCCC%5BC%40%40%5D2%28O%29c1cccc%28OC%29c1/file?format=sdf&get3d=True -- CN%28C%29C%5BC%40%40H%5D2CCCC%5BC%40%40%5D2%28O%29c1cccc%28OC%29c1 could not be loaded.