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. 2016 May 21;21(5):678. doi: 10.3390/molecules21050678
Comp. R1 R2 R3 R4 R5 R6 R7
6 β-H α-OH =O β-H α-CH3 β-H CH3
13 α-H =O H α-H α-CH3 β-H COOH
15 α-H β-OH =O α-H β-CH3 β-OH COOH
18 β-H β-OH =O β-H α-CH3 β-H COOH