Experimental

disorder in main residue; R factor = 0.047; wR factor = 0.129; data-to-parameter ratio = 13.0. In the title compound, C26H27BrN3O3P, the central pyrazole ring forms a dihedral angle of 71.7 (2) with the bromophenyl ring. In the crystal, molecules are linked by pairs of N—H O hydrogen bonds, forming inversion dimers with R2 2(10) ring motifs. Four C atoms of the 3-phenyl ring are disordered over two sets of sites [site occupancies = 0.745 (6) and 0.225 (6)]. Related literature For information on pyrazole derivatives, see: Sullivan et al. (2006); Patel et al. (2010). For a related structure, see: Saeed et al. (2009)