- dZZ_Ci(k)=dZZ_Ci(k)-uzgrad(j,k,2,i-1)*dC_norm(j,i+nres)
- dZZ_Ci1(k)=dZZ_Ci1(k)-uzgrad(j,k,1,i-1)*dC_norm(j,i+nres)
+ dZZ_Ci(k)=dZZ_Ci(k)-uzgrad(j,k,2,i-1)
+ & *dsign(1.0d0,dfloat(itype(i)))*dC_norm(j,i+nres)
+ dZZ_Ci1(k)=dZZ_Ci1(k)-uzgrad(j,k,1,i-1)
+ & *dsign(1.0d0,dfloat(itype(i)))*dC_norm(j,i+nres)