Collect. Czech. Chem. Commun.
1977, 42, 2701-2717
https://doi.org/10.1135/cccc19772701
Synthesis and spectral properties of cyclotripeptides containing 2-azetidinecarboxylic acid or proline
J. Vičar, P. Maloň, A. Trka, J. Smolíková, I. Frič and K. Bláha