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. 2012 Dec;167(8):1596–1608. doi: 10.1111/j.1476-5381.2012.02059.x

Figure 1.

Figure 1

Chemical structures of the triterpenes pristimerin (1), α-amyrin (2), β-amyrin (3) and euphol (4), all of which inhibit 2-AG hydrolysis. β-Amyrin (3) with geminal methyl groups in ring A (grey circle) is the most effective inhibitor of 2-AG degradation in cellular extracts.