subroutine int_from_cart1(lprn)
      implicit real*8 (a-h,o-z)
      include 'DIMENSIONS'
      include 'sizesclu.dat'
      include 'COMMON.IOUNITS'
      include 'COMMON.VAR'
      include 'COMMON.CHAIN'
      include 'COMMON.GEO'
      include 'COMMON.INTERACT'
      include 'COMMON.LOCAL'
      include 'COMMON.NAMES'
      logical lprn 
      if (lprn) write (iout,'(/a)') 'Recalculated internal coordinates'
      vbld(nres+1)=0.0d0
      vbld(2*nres)=0.0d0
      vbld_inv(nres+1)=0.0d0
      vbld_inv(2*nres)=0.0d0
      do i=2,nres
        dnorm1=dist(i-1,i)
        dnorm2=dist(i,i+1)
        do j=1,3
          c(j,maxres2)=0.5D0*(2*c(j,i)+(c(j,i-1)-c(j,i))/dnorm1
     &     +(c(j,i+1)-c(j,i))/dnorm2)
        enddo
        be=0.0D0
        if (i.gt.2) phi(i+1)=beta(i-2,i-1,i,i+1)
        if (i.gt.2) tauangle(3,i+1)=beta(i+nres-1,i-1,i,i+nres)
        if (i.gt.2) tauangle(1,i+1)=beta(i-1+nres,i-1,i,i+1)
        if (i.gt.2) tauangle(2,i+1)=beta(i-2,i-1,i,i+nres)
        omeg(i)=beta(nres+i,i,maxres2,i+1)
        theta(i+1)=alpha(i-1,i,i+1)
        alph(i)=alpha(nres+i,i,maxres2)
        vbld(i)=dist(i-1,i)
        vbld_inv(i)=1.0d0/vbld(i)
        vbld(nres+i)=dist(nres+i,i)
        if (itype(i).ne.10) then
          vbld_inv(nres+i)=1.0d0/vbld(nres+i)
        else
          vbld_inv(nres+i)=0.0d0
        endif
      enddo   
      do i=1,nres-1
        do j=1,3
          dc(j,i)=c(j,i+1)-c(j,i)
          dc_norm(j,i)=dc(j,i)*vbld_inv(i+1)
        enddo
      enddo
      do i=1,nres
        do j=1,3
          dc(j,i+nres)=c(j,i+nres)-c(j,i)
          dc_norm(j,i+nres)=dc(j,i+nres)*vbld_inv(i+nres)
        enddo
      enddo
      if (lprn) then
      do i=2,nres
       write (iout,1212) restyp(itype(i)),i,vbld(i),
     &rad2deg*theta(i),rad2deg*phi(i),vbld(nres+i),
     &rad2deg*alph(i),rad2deg*omeg(i)
      enddo
      endif
 1212 format (a3,'(',i3,')',2(f15.10,2f10.2))
      return
      end