inpcrd->refcrd tgtmd: regular vacuum md, backbone restrained
 &cntrl
        imin = 0, ntx = 1, nstlim = 1000,
        dt = 0.002, ntc = 2, ntf = 2, tol = 0.000001,
        tempi = 300.0, temp0 = 300.0,
        cut = 10.0,
        ntpr = 50, ntwx = 50, ntwr = 500,
        ntb = 0, ntt = 1, tautp = 0.5, ntp = 0,
        igb = 0, nscm = 0, nmropt = 1, ntr = 1,
        restraintmask="@CA,C,O,N,H,HA", restraint_wt=5.0,
        itgtmd = 1, tgtrmsd = 5.516, tgtmdfrc = 2.0,
        tgtrmsmask=":TYR & !@CA,C,O,N,H,HA",
 /
 &ewald
        use_pme = 0, vdwmeth = 0, eedmeth = 4,
 /
 &wt
        TYPE='TGTRMSD', istep1=1, istep2=1000,
        value1 = 5.516, value2 = 0.0,
 /
 &wt
   type="END",
 /

