Answers are grounded in this paper and cite their sources.
The (13)C NMR shifts of 48 diazaphenanthrene-type alkaloids have been calculated at the B3LYP/6-311+G(2d,p) level of theory. The results support the structural reassignment of samoquasine A as 2.
No takes yet. Share an insight, caveat, or question.
Timmons et al. (2008) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: