P. Jain et al., The isolation and structure of pumiliotoxin 341A: A novel cyclic ether from the frog Epipedobates tricolor, HETEROCYCLE, 50(2), 1999, pp. 903-912
An alkaloid 341A isolated by HPLC from skin extracts of the Ecuadoran poiso
n frog Epipedobates tricolor was characterized by FTIR, MS and H-1-NMR spec
tral analysis and assigned a spiro-fused pyranoindolizidine structure (1).
It represents the first member of a small group of pumiliotoxin alkaloids t
o contain a cyclic ether moiety.