K. Likhitwitayawuid et al., TRADITIONAL MEDICINAL-PLANTS OF THAILAND .26. H-1 AND C-13 NMR ASSIGNMENTS OF ISOQUINOLINE ALKALOIDS, Journal of the Science Society of Thailand, 19(2), 1993, pp. 87-96
Use of two-dimensional NMR techniques, including the homonuclear COSY,
NOESY, HETCOR and COLOC experiments, to unequivocally assign the H-1
and C-13 NMR data of the isoquinoline alkaloids (-)-salutaridine, (-)-
dicentrine and (-)-tetrahydropalmatine is demonstrated.