double complex function BSYA1fqqppmp(e1,p2,p3,e4,za,zb,zab,zba)
      implicit none
C-----Authors: John Campbell and Keith Ellis, November 2011
C---- taken from arXiv:1101.5947 [hep-ph], limit of Eq. (102)
C---- (These are twiddle functions, c.f.arXiv:1101.5947[hep-ph],Eq.(91))
      include 'constants.f'
      include 'zprods_decl.f'
      include 'zabprods_decl.f'
      include 'massiveintegrals.f'
      double complex BSYA0qqppmp
      integer e1,p2,p3,e4
 
      BSYA1fqqppmp=2d0/3d0*BSYA0qqppmp(e1,p2,p3,e4,za,zb,zab,zba)
     & *(I23-1d0/3d0)

      return
      end