62896-17-7 Antibiotic N-1409 BRN 2513264 D-Norvaline, N-(N(sup 2)-L-alanyl-L-asparginyl)-2,4-didehydro-5-phosphono-, (Z)- N-1409 Plumbemycin B Plumbemycin-B cis-N-(N(sup 2)-L-Alanyl-L-asparginyl)-3,4-didehydro-5-phosphono-D-norvaline