- Novel C-2 substituted carbapenem derivatives. Part IV. Synthesis and biological activity of five membered heteroaromatic derivatives. Branch, C.L., Burton, G., Clarke, G.J., Coulton, S., Douglas, J.D., Eglington, A.J., Guest, A.W., Hinks, J.D., Hird, N.W., Holland, R.K., Hunt, E., Knott, S.J., Moss, S.F., Naylor, A., Pearson, M.J., Takle, A.K. J. Antibiot. (1998)