Nh. Nicholson et al., EVIDENCE THAT THE IMMEDIATE BIOSYNTHETIC PRECURSOR OF CLAVULANIC ACIDIS ITS N-ALDEHYDE ANALOG, Journal of the Chemical Society, Chemical Communications, (11), 1994, pp. 1281-1282
(3R, 5R) Clavulanate-9-aldehyde 1 has been detected in Streptomyces cl
avuligerus and an NADPH dependent dehydrogenase capable of reducing 1
to clavulanic acid 2 has been isolated from this organism.