Mr = 351.4, monoclinic, P21, a = 6.409 (1), b= 17.846 (2), c= 8.260/~, fl= 109.87 (1) °, U= 888.5 (2) A 3, Z= 2, Din= 1.316 (3), Dx= 1.314 Mg m -3, F(000) = 376,/t(Cu Ka) = 0.83 mm -~, ~,(Cu Ka)= 1.5418/k, room temperature. The structure was solved by direct methods with diffractometer data measured with, Cu Ka radiation, and full-matrix least-squares refinement converged at R = 0.036 for 1539 observed reflections. The carbonyl bonds of the ester functions are situated on the same side of the 11-membered macrocyclic ring and directed outwards from it resulting in an angle between the bonds of 93.9 (3) °. An intermolecular hydrogen bond between the hydroxyl substituent of the macrocyclic ring and the N atom links the molecules into helices extending along the b axis.