ERROR opening https://cactus.nci.nih.gov/chemical/structure/OC%28Cn1cncn1%29%28Cn1cncn1%29c1ccc%28F%29cc1F/file?format=sdf&get3d=True  -- OC%28Cn1cncn1%29%28Cn1cncn1%29c1ccc%28F%29cc1F could not be loaded.