A considerable number of natural products have been published in
recent years with misassigned structure, even though they had been
correctly elucidated in the past. The availability of databases containing
revised structures can prevent the amplification of errors in structural
elucidation. NAPROC-13, a dereplication tool based on the 13C chemical shift, has been used to search for substances that, possessing
the same chemical shifts, have been described with different structures.
The correct structure of these different structural proposals is verified
by computational chemistry. This paper reports the structural revision
of nine triterpenoids following this methodology.
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