Figure 1.
Chemical structures. A. Chemical structure of an α-methylene sesquiterpene lactone, EPD. B. Chemical structure of an α-methylene carboxylic acid, EPA.
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.