ERROR opening https://cactus.nci.nih.gov/chemical/structure/CCn1cncc1-c1c%5BnH%5Dc2ccc%28I%29cc12/file?format=sdf&get3d=True  -- CCn1cncc1-c1c%5BnH%5Dc2ccc%28I%29cc12 could not be loaded.