ERROR opening https://cactus.nci.nih.gov/chemical/structure/n1oc%28%5BNH-%5D%29c%5Bn%2B%5D1C%28Cc2ccccc2%29C/file?format=sdf&get3d=True  -- n1oc%28%5BNH-%5D%29c%5Bn%2B%5D1C%28Cc2ccccc2%29C could not be loaded.