82576-50-9 Alahopcin Antibiotic B 52653 Antibiotic T 804A B-52653 BRN 4818264 L-Norvaline, N-L-alanyl-3-((hydroxyamino)carbonyl)-5-oxo-, threo- Nourseimycin threo-N-L-Alanyl-3-((hydroxyamino)carbonyl)-5-oxo-L-norvaline