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Information materials

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