ERROR opening https://cactus.nci.nih.gov/chemical/structure/n2c%28nnc%28c1ccc%28OC%29cc1%29c2c3ccc%28OC%29cc3%29C/file?format=sdf&get3d=True  -- n2c%28nnc%28c1ccc%28OC%29cc1%29c2c3ccc%28OC%29cc3%29C could not be loaded.