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Structural formula of the Natural products.
| 1. The structural formula of flavonoids-1 |
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| 2. The structural formula of flavonoids-2 |
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| 3. The structural formula of phenols-1 |
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| 4. The structural formula of phenols-2 |
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| 5. The structural formula of polysaccharides, saponins and terpenoid |
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| 6. The structural formula of alkaloids and quinones |
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