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03/12/2013 19:34:16
Hello, For colbalamin (B12) the mon-isotopic mass given in Chemspider does not seem to correspond to the calculated mon-isotopic mass using C, H, N, O, P, and Co values from Chemspider. This does not seem to be a simple rounding error. ChemCalc.org agrees with the calculated, but not the Chemspider, value. This seems true for other molecules, too. (verapamil, ritonavir). Are there assumptions that I am missing? Sincerely, Robert
05/12/2013 14:42:19
Thank you for your feedback - we are investigating this and will let you know when we know more.
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