ERROR opening https://cactus.nci.nih.gov/chemical/structure/Oc1c%28OC%29c%28OC%29cc2c1CN%28CC2%29C/file?format=sdf&get3d=True  -- Oc1c%28OC%29c%28OC%29cc2c1CN%28CC2%29C could not be loaded.