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. 2017 Mar 21;8:149. doi: 10.3389/fphar.2017.00149

FIGURE 1.

FIGURE 1

Chemical structures of tritium-labeled geissoschizine methyl ether ([3H]GM) and 18β-glycyrrhetinic acid ([3H]GA). For [3H]GM, three tritium atoms were introduced into the methyl group of the methyl ester in its structure; For [3H] GA, one tritium atom was introduced at the third position in its structure.