87003-23-4 Antibiotic SF 2132 L-Serine, N(sup 2)-(3-amino-5-((aminoiminomethyl)amino)-1-oxopentyl)-2,3-diaminobutanoyl-2,3,4,5-tetrahydro-3-pyridazinecarbonyl-L-leucyl-4-((aminocarbonyl)oxy)-2,3-didehydronalyl- SF 2132