An antibacterial pyrazole derivative from Burkholderia glumae, a bacterial pathogen of rice

Two compounds from liquid cultures of Burkholderia glumae were determined to be l-alanyl-l-homoserinyl-l-aspartic acid, and 3-[l-alanyl-l-homoserinyl-l-aspartyl-β-carboxy]-4-hydroxy-5-oxopyrazole, the latter having antibacterial properties.