| (23) villosin C | R1 = 2H; | R2 = H; | R3 = OH; | R4 = OH |
| (31) 6-methoxyvillosin C | R1 = 2H; | R2 = H; | R3 = OCH3; | R4 = OH |
| (32) 18-hydroxy-6-methoxyvillosin C | R1 = 2H; | R2 = OH; | R3 = OCH3; | R4 = OH |
| (33) (10R,16S)-12,16-epoxy-11,14-dihydroxy-6-methoxy-17(15→16)-abeo-abieta-5,8,11,13-tetraene-3,7-dione | R1 = O; | R2 = H; | R3 = OCH3; | R4 = H |
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