Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Pyrrolizidine alkaloids observed in Gynura bicolor. (A) G. bicolor plant. (B) G. bicolor leaves from the upper (green) and lower (ruby-colored) side. (B) Senecionine, seneciphylline and retrorsine were reported in G. bicolor in both, their free forms (shown above) and as N-oxides, while intergerrimine, spartiodine, and senkirkine were only found as free alkaloids.
