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Published online by Cambridge University Press: 30 November 2012
X-ray powder diffraction data, unit-cell parameters, and space group for a new chiral Kemp's acid diamide, C21H26N2O3, are reported [a = 16.061(4) Å, b = 14.340(5) Å, c = 8.361(2) Å, β = 97.678(4)°, unit-cell volume V = 1908,54 Å3, Z = 4, and space group P21]. All measured lines were indexed and found to be consistent with the P21 space group. No detectable impurity was observed.