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Canonically numbered structure and calculated data fields for L-threonine. NM = (common) name, ST = absolute/relative stereochemistry, SD = number of defined stereocenters, SU = number of undefined stereocenters, BD = number of defined double bonds, BU = number of undefined double bonds, RC = number of rings, US = unique string (stereochemistry included), UC = unique string (stereochemistry excluded), MF = molecular formula, MW = molecular weight, MZ = M/Z peak with abundance.
