4'-O-Benzyl Oxyphenbutazone, EINECS 250-725-3, 1-(4-benzyloxy-phenyl)-4-butyl-2-phenyl-pyrazolidine-3,5-dione, 4-Butyl-2-phenyl-1-(4-(phenylmethoxy)phenyl)pyrazolidine-3,5-dione, 1-[p-(Benzyloxy)phenyl]-4-butyl-2-phenyl-3,5-pyrazolidinedione, 1-(4-Benzyloxy-phenyl)-4-butyl-2-phenyl-pyrazolidin-3,5-dion