I want to add a trisaccharide to my structure, but when I run phenix.refine the sugar breaks up. I know I need to specify the links on the sugar and that they must be in the reverse order, but I don't know how to do that. i.e., Some thing like this... which worked fine with a different sugar (below) refinement.pdb_interpretation { apply_cif_link { data_link = ALPHA1-2 residue_selection_1 = chain D and resname GAL and resid 2 residue_selection_2 = chain D and resname FUC and resid 1 } apply_cif_link { data_link = BETA1-3 residue_selection_1 = chain D and resname NGA and resid 3 residue_selection_2 = chain D and resname GAL and resid 2 BUT now I have a new sugar (below is the pdb). I want to create the links, does anyone know how to do this? HETATM 2386 C1 FUC A 1 16.834 10.319 -8.554 1.00 66.42 C HETATM 2387 C2 FUC A 1 16.606 11.012 -7.166 1.00 61.84 C HETATM 2388 C3 FUC A 1 17.009 12.513 -7.241 1.00 59.45 C HETATM 2389 C4 FUC A 1 16.144 13.200 -8.308 1.00 60.73 C HETATM 2390 C5 FUC A 1 16.343 12.478 -9.659 1.00 61.11 C HETATM 2391 C6 FUC A 1 15.451 13.074 -10.752 1.00 58.85 C HETATM 2392 O1 FUC A 1 18.293 10.173 -8.848 1.00 75.63 O HETATM 2393 O2 FUC A 1 17.360 10.357 -6.166 1.00 60.01 O HETATM 2394 O3 FUC A 1 16.815 13.162 -5.990 1.00 59.75 O HETATM 2395 O4 FUC A 1 14.774 13.159 -7.919 1.00 58.98 O HETATM 2396 O5 FUC A 1 16.051 11.063 -9.520 1.00 61.98 O HETATM 2397 C1 GAL A 2 18.717 9.760 -11.037 1.00 85.92 C HETATM 2398 C2 GAL A 2 18.373 9.162 -9.615 1.00 83.98 C HETATM 2399 C3 GAL A 2 19.592 8.289 -9.187 1.00 87.51 C HETATM 2400 C4 GAL A 2 19.814 7.192 -10.269 1.00 87.23 C HETATM 2401 C5 GAL A 2 20.123 7.872 -11.635 1.00 86.28 C HETATM 2402 C6 GAL A 2 20.336 6.876 -12.795 1.00 83.95 C HETATM 2403 O2 GAL A 2 17.629 10.430 -11.635 1.00 91.09 O HETATM 2404 O3 GAL A 2 18.638 6.383 -10.380 1.00 88.24 O HETATM 2405 O4 GAL A 2 19.031 8.744 -12.000 1.00 86.74 O HETATM 2406 O5 GAL A 2 20.641 7.401 -14.059 1.00 79.17 O HETATM 2407 O6 GAL A 2 20.370 8.579 -8.053 1.00 95.12 O HETATM 2408 C1 NGA A 3 20.960 9.184 -6.913 1.00100.54 C HETATM 2409 C2 NGA A 3 20.707 8.446 -5.548 1.00103.23 C HETATM 2410 C3 NGA A 3 20.064 9.437 -4.546 1.00103.55 C HETATM 2411 C4 NGA A 3 21.015 10.661 -4.359 1.00103.72 C HETATM 2412 C5 NGA A 3 21.252 11.342 -5.751 1.00103.24 C HETATM 2413 C6 NGA A 3 22.221 12.560 -5.693 1.00103.28 C HETATM 2414 C7 NGA A 3 20.349 6.053 -6.269 1.00107.39 C HETATM 2415 C8 NGA A 3 19.294 4.961 -6.441 1.00107.38 C HETATM 2416 N2 NGA A 3 19.860 7.256 -5.781 1.00105.47 N HETATM 2417 O3 NGA A 3 19.829 8.805 -3.291 1.00102.40 O HETATM 2418 O4 NGA A 3 22.255 10.230 -3.783 1.00105.38 O HETATM 2419 O5 NGA A 3 21.766 10.375 -6.714 1.00101.87 O HETATM 2420 O6 NGA A 3 22.993 12.697 -6.878 1.00104.86 O HETATM 2421 O7 NGA A 3 21.514 5.860 -6.552 1.00110.32 O END Kindly, Grant