Deformation of orthosymplectic Lie superalgebra osp(1|2)
  Triangular deformation of the orthosymplectic Lie superalgebra osp(1|4) is defined by chains of twists. Corresponding classical r-matrix is obtained by a contraction procedure from the trigonometric r-matrix. The carrier space of the constant r-matrix is the Borel subalgebra. 
E. Celeghini and P. P. Kulish