ERROR opening https://cactus.nci.nih.gov/chemical/structure/C%28C%29%28%2A%29%28C%29C.c1%28ccc%28O%29cc1%29OC/file?format=sdf&get3d=True  -- C%28C%29%28%2A%29%28C%29C.c1%28ccc%28O%29cc1%29OC could not be loaded.