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The structures of ligustrazine-benzoic acid derivatives.
| Structure | Yield | Structure | Yield |
|---|---|---|---|
 |
61.1% |  |
85.1% |
| 1a | 1b | ||
 |
64.0% |  |
47.6% |
| 1c | 1d | ||
 |
61.7% |  |
81.9% |
| 2a | 2b | ||
 |
64.4% |  |
52.6% |
| 2c | 2d | ||
 |
61.7% |  |
89.7% |
| 3a | 3b | ||
 |
63.2% |  |
60.1% |
| 3c | 3d | ||
 |
62.5% |  |
87.4% |
| 4a | 4b | ||
 |
67.5% |  |
54.7% |
| 4c | 4d | ||
 |
58.4% |  |
87.1% |
| 5a | 5b | ||
 |
51.2% |  |
54.7% |
| 5c | 5d |
