Pharmaceutical IntermediateChina Top Quality Met-Enkephalin / Met-Enkephalin CAS No: 58569-55-4 H-Tyr-Gly-Gly-Phe-Met-Oh, Find details about China H-Tyr-Gly-Gly-Phe-Met-Oh, 58569-55-4 from Top Quality Met-Enkephalin / Met-Enkephalin CAS No: 58569-55-4 H-Tyr-Gly-Gly-Phe-Met-Oh