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. 2014 Oct 30;19(11):17478–17535. doi: 10.3390/molecules191117478
Cpd R1 R2 R3 R4 R5 R6 R7 R8
106 =O =O H α-OH β-CH3 ξ-OH =O COOH
107 β-OH β-OH H =O α-CH3 β-OH ξ-OH ξ-COOH
108 =O β-OH H =O α-CH3 β-OH ξ-OH ξ-COOH
109 β-OH β-OH β-OH =O β-CH3 β-OH =O COOH
110 β-OH β-OH =O =O α-CH3 ξ-OH =O COOH