N-(5.alpha.,3.beta.-Cholestanyl)-N-[6,6-(3',3-dicarboxy-5~ ,5"-dichloro-4,4-dimethoxydiphenyl)-5- hexenyl]-3,3-(3',3 -dicarboxy-5,5"-dichloro-4,4-dimethoxydiphenyl)-2-propenamide tetraammonium salt NSC707005