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. 2014 Oct 30;19(11):17478–17535. doi: 10.3390/molecules191117478
Cpd R1 R2 R3 R4
99 β-OH β-OH H α-OH
100 =O =O H =O
101 =O =O β-O-Ac =O
102 β-OH =O β-O-Ac =O
103 β-OH β-OH β-OH =O
104 =O β-OH OH =O
105 β-OH =O OH =O