A number of 22, 27-imino-17, 23-oxidojervane derivatives have been synthesized. The chemical shift values for all the Me groups of 65 derivatives of jervane are presented, and the effects of many different substituents on these chemical shifts are analysed. The additivity principle is shown to hold satisfactorily for the 19-Me protons of these C-nor-D- homosteroid alkaloids.
![(3'R,3'aS,6'S,6aS,6bS,7'aR,9R,11aS,11bR)-3',6',10,11b-tetramethylspiro[1,2,5,6,6a,6b,7,8,11,11a-decahydrobenzo[a]fluorene-9,2'-3a,4,5,6,7,7a-hexahydro-3H-furo[3,2-b]pyridine]-3-one结构式](https://image.chemsrc.com/caspic/436/14410-98-1.png)