A second polymorph of carvedilol

A second polymorph of the title compound [systematic name: 1-(9H-carbazol-4-yl­oxy)-3-[2-(2-methoxy­phen­oxy)ethyl­amino]­propan-2-ol], C24H26N2O4, is described. The other polymorph [Chen, Zeng, Yu & Xu (1998). Jiegou Huaxue (Chin. J. Struct. Chem.), 17, 325–328] also crystallizes in the space group P21/c, but differs in two torsion angles of the chain connecting the aromatic residues. On the other hand, the hydrogen-bond patterns of the two polymorphs are rather similar.