SCHEDULED MAINTENANCE
Structural variants on the acylamino-side chains of penicillins as substrates for the ring expansion enzyme from Cephalosporium acremonium CO728 show that a six carbon chain terminating in a carboxy group permits efficient conversion into cephems with the exception of δ-(L-α-aminoadipoly)[5-(5S)-amino-5-carboxypentanoyl].
J. E. Baldwin, R. M. Adlington, J. B. Coates, M. J. C. Crabbe, J. W. Keeping, G. C. Knight, T. Nomoto, C. J. Schofield and H. Ting, J. Chem. Soc., Chem. Commun., 1987, 374 DOI: 10.1039/C39870000374
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