ERROR opening https://cactus.nci.nih.gov/chemical/structure/COc2cc%28ccc2%29C%3DNN%3DCc1cccc%28OC%29c1/file?format=sdf&get3d=True  -- COc2cc%28ccc2%29C%3DNN%3DCc1cccc%28OC%29c1 could not be loaded.