SQ 27,860, a simple carbapenem produced by species of Serratia and Erwinia.

Abstract
In a continued search for the production of .beta.-lactam-containing molecules from bacteria, the isolation and structure determination of a simple carbapenem, SQ 27,860, produced by species of Serratia and Erwinia, are reported. The antibiotic is highly unstable and isolation was achieved through the p-nitrobenzyl ester.