- Synthesis and structure-activity relationship of N-alkyl Gly-boro-Pro inhibitors of DPP4, FAP, and DPP7. Hu, Y., Ma, L., Wu, M., Wong, M.S., Li, B., Corral, S., Yu, Z., Nomanbhoy, T., Alemayehu, S., Fuller, S.R., Rosenblum, J.S., Rozenkrants, N., Minimo, L.C., Ripka, W.C., Szardenings, A.K., Kozarich, J.W., Shreder, K.R. Bioorg. Med. Chem. Lett. (2005)