Figure 20.

Structures of compounds 197–213.

Cpd	R1	R2	R3	R4	R5	R6
197	β-OH	H	α-CH3	△24,25	△24,25	CHO
198	β-O-Ac	H	α-CH3	OAc	OH	CH2-O-Ac
199	=O	H	β-CH3	△24,25	△24,25	CHO
200	=O	H	β-CH3	△24,25	△24,25	CH2OH
201	β-OH	H	α-CH3	α-OH	OH	CH3
202	=O	H	β-CH3	α-OH	H	CH2OH
203	β-OH	H	α-CH3	OH	OH	CH2OH
204	=O	H	α-CH3	OH	OH	CH3
205	β-OH	α-O-Ac	β-CH3	H	H	COOH
206	=O	α-OH	α-CH3	△24,25	△24,25	COOH
207	α-OH	α-OH	β-CH3	△24,25	△24,25	COOH
208	β-OH	α-OH	β-CH3	△24,25	△24,25	COOH
209	α-O-Ac	α-O-Ac	β-CH3	△24,25	△24,25	COOH
210	=O	H	α-CH3	OH	OH	CH2OH
211	=O	α-OH	α-CH3	△24,25	△24,25	COOH
212	=O	α-OH	α-CH3	△24,25	△24,25	CH2OH
213	β-OH	H	α-CH3	△24,25	△24,25	COOH