62896-18-8 Antibiotic N-1409 A BRN 2490358 D-Norvaline, N-(N-L-alanyl-L-alpha-aspartyl)-3,4-didehydro-5-phosphono-, (Z)- N-1409 A Plumbemycin A cis-N-(N-L-Alanyl-L-alpha-aspartyl)-3,4-didehydro-5-phosphono-D-norvaline