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diff --git a/source/unres/src_MD/md-diff/np/tnp_respa_step1.f b/source/unres/src_MD/md-diff/np/tnp_respa_step1.f
deleted file mode 100644
index 0382a2f..0000000
--- a/source/unres/src_MD/md-diff/np/tnp_respa_step1.f
+++ /dev/null
@@ -1,62 +0,0 @@
-c-----------------------------------------------------------------
-      subroutine tnp_respa_step1
-c Applying Nose-Poincare algorithm - step 1 to vel for RESPA
-c J.Comput.Phys. 151 114 (1999) S.D.Bond B.J.Leimkuhler B.B.Laird
-c
-c d_t is not updated here, it is destroyed
-c
-      implicit real*8 (a-h,o-z)
-      include 'DIMENSIONS'
-      include 'COMMON.CONTROL'
-      include 'COMMON.VAR'
-      include 'COMMON.MD'
-      include 'COMMON.CHAIN'
-      include 'COMMON.DERIV'
-      include 'COMMON.GEO'
-      include 'COMMON.LOCAL'
-      include 'COMMON.INTERACT'
-      include 'COMMON.IOUNITS'
-      include 'COMMON.NAMES'
-      double precision C_np,d_time_s,tmp,d_time_ss
-      double precision energia(0:n_ene)
-
-      d_time_s=d_time*0.5*s_np        
-
-      do j=1,3
-        d_t_old(j,0)=d_t_old(j,0)+d_a(j,0)*d_time_s
-      enddo
-      do i=nnt,nct-1	
-        do j=1,3    
-          d_t_old(j,i)=d_t_old(j,i)+d_a(j,i)*d_time_s
-        enddo
-      enddo
-      do i=nnt,nct
-        if (itype(i).ne.10) then
-          inres=i+nres
-          do j=1,3    
-           d_t_old(j,inres)=d_t_old(j,inres)+d_a(j,inres)*d_time_s
-          enddo
-        endif      
-      enddo 
-
-
-c      C_np=0.5*d_time*(dimen*Rb*t_bath*(1.0+log(s_np))-EK+potE-H0)
-c     &                     -pi_np
-c
-c      pistar=-2.0*C_np/(1.0+sqrt(1.0-C_np*d_time/Q_np))
-c      tmp=0.5*d_time*pistar/Q_np
-c      s12_np=s_np*(1.0+tmp)/(1.0-tmp)
-c      write(iout,*) 'tnp_respa_step1',s_np,s12_np,EK,potE,C_np,pistar,tmp
-
-ct1      pi_np=pistar
-c      sold_np=s_np
-c      s_np=s12_np
-
-c-------------------------------------
-c test of reviewer's comment
-       pi_np=pi_np-0.5*d_time*(E_long+Csplit-H0)
-cr       print '(a,3f)','1 pi_np,s_np',pi_np,s_np,E_long
-c-------------------------------------
-
-      return
-      end