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This paper describes a rare phenomenon of multi-conformers caused by conformational change of A-ring in the C 18 - and C 19 -  N -dealkyl diterpenoid alkaloids. The possible reasons for the generation of multiple conformational isomers are complex, which could be affected by the substituents at C-1, C-3, C-13, C-14, and C-15, pH, solvents, the intramolecular hydrogen bond between 1α-OCH 3 /1α-OH and N-H groups, acid-base treatment, preparation methods, and work-up procedures.

Multi-conformers caused by conformational change of A-ring in the C 18 - and C 19 - N -dealkyl diterpenoid alkaloids