3a,7-Epoxy-3aH-furo(3,2-b)oxocin-3-carboxylic acid, octahydro-5-(6-(2,5-dihydro-4-hydroxy-1-methyl-2-oxo-1H-pyrrol-3-yl)-1,3-dimethyl-6-oxo-2,4-hexadienyl)-2,6,9a-trimethyl-8-oxo-, methyl ester, sodium salt, (2R-(2-alpha,3-alpha,3a-alpha,5-alpha(1R*,2E,4E),6-beta,7-alpha,9a-beta))- 69774-86-3 69831-38-5 Antibiotic BU-2313A sodium salt