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Table 1 The structures of glycyrrhetinic acid hybrids 1a–9a

From: Design, synthesis, and biological evaluation of the novel glycyrrhetinic acid-cinnamoyl hybrids as anti-tumor agents

No. R1 R2 R3 R4
1a H H H H
2a H H CH3 H
3a OCH3 H H H
4a H OCH3 H H
5a H H OCH3 H
6a OCH3 OCH3 H H
7a OCH3 H H OCH3
8a OCH3 OCH3 OCH3 H
9a H OCH3 OCH3 OCH3