ERROR opening https://cactus.nci.nih.gov/chemical/structure/c1%28c%28cc%28%5BN%2B%5D%28%3DO%29%5BO-%5D%29cc1%29N%29OCCC/file?format=sdf&get3d=True -- c1%28c%28cc%28%5BN%2B%5D%28%3DO%29%5BO-%5D%29cc1%29N%29OCCC could not be loaded.