ERROR opening https://cactus.nci.nih.gov/chemical/structure/CCNC%28C%29Cc1cccc%28C%28F%29%28F%29F%29c1/file?format=sdf&get3d=True  -- CCNC%28C%29Cc1cccc%28C%28F%29%28F%29F%29c1 could not be loaded.