Piptadenia Alkaloids. Indole Bases of P. peregrina (L.) Benth. and Related Species Fish, M. S. ; Johnson, N. M. ; Horning, E. C. Abstract Publication: Journal of the American Chemical Society Pub Date: November 1955 DOI: 10.1021/ja01627a034 Bibcode: 1955JAChS..77.5892F