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R1:OH/R2:OH
R1:H/R2:COOH
R1:COOH/R2:COOH
R1:COOH/R2:COOH
R1:COOH/R2:COOCH3
R1:OH/R2:OH
R1:COOH/R2:COOH
R1:COOH/R2:COOH
R1:CHO/R2:COOCH3
R1:COOH/R2:COOCH3
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