A second monoclinic polymorph of N-[bis-(morpholin-4-yl)phosphino-yl]-4-fluoro-benzamide with the P2(1)/n space group.

A second monoclinic polymorph of the title mol-ecule, C(15)H(21)FN(3)O(4)P, is reported in the space group P2(1)/n and compared to the previously reported C2/c space group [Gholivand et al. (2006 ▶). Polyhedron, 25, 711-721]. The asymmetric unit of the title compound consists of two independent mol-ecules. The P atoms adopt a distorted tetra-hedral environment. In the C(O)NHP(O) fragment, the P=O and the N-H groups are in a syn conformation with respect to each other and in the crystal, inter-molecular N-H⋯O=P hydrogen bonds form dimeric aggregates.