... Please enable JavaScript to use all the features on this page. Tetrahedron: Asymmetry. Volume 22, Issue 6, 30 March 2011, Pages 613–618. Cover image Cover image. ... C 12 H 13 NO 4. [ α ] D 22 = - 30.6 (c 0.56, CHCl 3 ). Source of chirality: asymmetric synthesis. ...