Figure 15.
2D structures of (a) glycyrrhetinic acid, (b) betulinic acid, (c) ursolic acid, (d) oleanolic acid.
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.