share/top/amber99sb-ildn-bsc0.ff/dna.r2b

   1 ; rtp residue to rtp building block table
   2 ;GMX   Force-field
   3 DA    DA        DA5     DA3     DAN
   4 DG    DG        DG5     DG3     DGN
   5 DC    DC        DC5     DC3     DCN
   6 DT    DT        DT5     DT3     DTN