ERROR opening https://cactus.nci.nih.gov/chemical/structure/OC%28c1c2ccccc2cc3ccccc13%29C%28F%29%28F%29F/file?format=sdf&get3d=True  -- OC%28c1c2ccccc2cc3ccccc13%29C%28F%29%28F%29F could not be loaded.