First, I was unable to reproduce the list of (13C) “scaled shifts” for compd 15A, Nankakurine A in Smith and Goodman 2010, Table 2, *using the formula supplied by Smith and Goodman*. I communicated these results to Prof. Goodman in early February 2012, but the issue remains unresolved. Until my error, if it exists, is identified, I have to assume that the error lies in the published procedure and the procedure is *currently* unusable as published.

Second, DP4 method relies on several questionable assumptions about the distributions of errors, the parameters associated with this distribution, and the calculation of “probabilities” from this distribution. Therefore, one use caution in how one refers to the numerical values that DP4 assigns to probabilities. When DP4 assigns “100% probability” to a structure assignment, this does not necessarily guarantee certainty. It just means that the DP4 probability (and not even necessarily the true probability) for this structure assignment is higher than one with a lower DP4 probability value.

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