ERROR opening https://cactus.nci.nih.gov/chemical/structure/COc3c%28OC%29c1c2c%28O%29ccc%28OC%29c2ccc1cc3O/file?format=sdf&get3d=True  -- COc3c%28OC%29c1c2c%28O%29ccc%28OC%29c2ccc1cc3O could not be loaded.