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. 2014 Oct 30;19(11):17478–17535. doi: 10.3390/molecules191117478
Cpd R1 R2 R3 R4 R5 R6 R7 R8 R9
142 =O =O =O H α-OH β-CH3 =O H COOH
143 =O =O =O H α-OH β-CH3 =O H COOCH3
144 =O =O =O =O =O β-CH3 =O H COOH
145 H H H H H α-CH3 H ξ-CH3 =O