J Am Chem Soc. 1977 Nov; 99(24): 8040-4.

Bouvardin and deoxybouvardin, antitumor cyclic hexapeptides from Bouvardia ternifolia (Rubiaceae).

Jolad SD, Hoffmann JJ, Torrance SJ, Wiedhopf RM, Cole JR, Arora SK, Bates RB, Gargiulo RL, Kriek GR.