              The [2][1] element of the matrix used to rotate the subset of the\
               Cartesian coordinates in the ATOM_SITE category identified in the\
               STRUCT_BIOL_GEN category to a view useful for describing the\
               structure. The conventions used in the rotation are described in\
               _struct_biol_view.details.\
\
               |x'|                         |11 12 13| |x|\
               |y'|~reoriented Cartesian~ = |21 22 23| |y|~Cartesian~\
               |z'|                         |31 32 33| |z|