Figure 1.
Percentage of 
—1,4-dimethyl azulene (53) and 
—anastreptene (18), depending on the extraction method.
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.