| R1 | R2 | R3 | R4 | R5 | |
| 1 | OH | OH | COOH | H | OH |
| 2 | OH | OH | COOH | H | S |
| 2a | OH | OH | COOH | H | OH |
| 3 | H | OH | COOH | OH | OH |
| 4 | H | -β-d-glc | CH3 | OH | S |
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