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.
Basic structure of flavonoids and their subclasses. The core structure of flavonoids is a diphenylpropane skeleton (C6-C3-C6), which contains two phenyl rings and one heterocyclic ring. Based on their chemical structure, flavonoids can be further classified further into flavones, flavanones, flavanols, flavonols, isoflavones, and anthocyanins/anthocyanidins.
