Hi all, In my structure, the ASN and the linked NAG has two conformations. The pdb: ATOM 3685 C1 ANAG A2061 4.069 2.862 24.649 0.47 31.33 C ANISOU 3685 C1 ANAG A2061 3426 4664 3813 -664 421 625 C ATOM 3686 C1 BNAG A2061 9.105 0.384 22.719 0.53 40.81 C ANISOU 3686 C1 BNAG A2061 5087 5333 5084 24 -72 -116 C ATOM 3690 C2 ANAG A2061 4.508 1.905 25.749 0.47 34.38 C ANISOU 3690 C2 ANAG A2061 3953 4727 4383 -441 142 473 C ATOM 3691 C2 BNAG A2061 8.311 -0.893 22.808 0.53 40.91 C ANISOU 3691 C2 BNAG A2061 5087 5438 5018 13 -55 -37 C ATOM 3694 N2 ANAG A2061 5.010 0.727 25.059 0.47 35.56 N ANISOU 3694 N2 ANAG A2061 4185 4888 4437 -466 149 254 N ATOM 3695 N2 BNAG A2061 7.220 -0.767 23.761 0.53 40.82 N ANISOU 3695 N2 BNAG A2061 5159 5512 4836 246 -144 -112 N ATOM 3698 C7 ANAG A2061 6.312 0.507 24.874 0.47 34.61 C ANISOU 3698 C7 ANAG A2061 4357 4653 4141 -406 202 282 C ATOM 3699 C7 BNAG A2061 5.974 -1.172 23.460 0.53 41.98 C ANISOU 3699 C7 BNAG A2061 5327 5677 4943 117 8 -149 C ATOM 3700 O7 ANAG A2061 7.194 1.236 25.322 0.47 35.05 O ANISOU 3700 O7 ANAG A2061 4292 4626 4396 -724 290 343 O ATOM 3701 O7 BNAG A2061 5.625 -1.665 22.371 0.53 44.02 O ANISOU 3701 O7 BNAG A2061 5616 5774 5335 6 -122 -208 O ATOM 3702 C8 ANAG A2061 6.699 -0.698 24.067 0.47 33.30 C ANISOU 3702 C8 ANAG A2061 4119 4700 3832 -193 57 303 C ATOM 3703 C8 BNAG A2061 4.933 -0.984 24.514 0.53 42.31 C ANISOU 3703 C8 BNAG A2061 5260 5612 5203 157 -4 -125 C ATOM 3710 C3 ANAG A2061 3.357 1.608 26.717 0.47 34.94 C ANISOU 3710 C3 ANAG A2061 3903 4950 4420 -528 289 456 C ATOM 3711 C3 BNAG A2061 9.296 -2.001 23.171 0.53 40.83 C ANISOU 3711 C3 BNAG A2061 5144 5347 5021 31 -211 -83 C ATOM 3714 O3 ANAG A2061 3.801 0.844 27.813 0.47 37.07 O ANISOU 3714 O3 ANAG A2061 4043 5387 4655 -327 106 508 O ATOM 3715 O3 BNAG A2061 8.608 -3.231 23.147 0.53 41.68 O ANISOU 3715 O3 BNAG A2061 5286 5504 5046 -142 -263 97 O ATOM 3718 C4 ANAG A2061 2.696 2.880 27.229 0.47 33.38 C ANISOU 3718 C4 ANAG A2061 3490 4870 4323 -715 378 575 C ATOM 3719 C4 BNAG A2061 10.480 -2.021 22.187 0.53 39.61 C ANISOU 3719 C4 BNAG A2061 4854 5338 4854 85 -226 -13 C ATOM 3722 O4 ANAG A2061 1.507 2.534 27.956 0.47 35.04 O ANISOU 3722 O4 ANAG A2061 3669 4878 4766 -843 393 668 O ATOM 3723 O4 BNAG A2061 11.583 -2.708 22.745 0.53 37.22 O ANISOU 3723 O4 BNAG A2061 4397 5524 4220 146 -644 59 O ATOM 3726 C5 ANAG A2061 2.336 3.744 26.026 0.47 34.15 C ANISOU 3726 C5 ANAG A2061 3749 4890 4334 -733 503 550 C ATOM 3727 C5 BNAG A2061 11.003 -0.643 21.780 0.53 39.23 C ANISOU 3727 C5 BNAG A2061 4886 5258 4760 33 -165 -30 C ATOM 3730 C6 ANAG A2061 1.625 5.025 26.471 0.47 35.40 C ANISOU 3730 C6 ANAG A2061 4140 4847 4461 -657 269 378 C ATOM 3731 C6 BNAG A2061 11.764 -0.744 20.462 0.53 39.76 C ANISOU 3731 C6 BNAG A2061 5000 5228 4877 79 -185 -106 C ATOM 3736 O6 ANAG A2061 2.432 5.674 27.428 0.47 37.10 O ANISOU 3736 O6 ANAG A2061 4302 5083 4710 -773 428 205 O ATOM 3737 O6 BNAG A2061 10.918 -1.227 19.435 0.53 40.11 O ANISOU 3737 O6 BNAG A2061 4599 5472 5169 313 -83 -277 O ATOM 3740 O5 ANAG A2061 3.507 4.032 25.210 0.47 33.36 O ANISOU 3740 O5 ANAG A2061 3905 4796 3974 -742 445 909 O ATOM 3741 O5 BNAG A2061 9.974 0.304 21.624 0.53 39.18 O ANISOU 3741 O5 BNAG A2061 5023 5184 4676 -220 -99 -108 O ATOM 1157 N ASN A 61 8.496 4.626 20.319 1.00 26.85 N ANISOU 1157 N ASN A 61 3029 4695 2476 -1809 -655 1273 N ATOM 1158 CA AASN A 61 7.080 4.398 20.655 0.50 24.65 C ANISOU 1158 CA AASN A 61 2996 4000 2368 -1776 -634 980 C ATOM 1159 CA BASN A 61 7.083 4.446 20.752 0.50 25.61 C ANISOU 1159 CA BASN A 61 3174 4178 2376 -1622 -618 912 C ATOM 1162 CB AASN A 61 6.952 3.807 22.077 0.50 23.96 C ANISOU 1162 CB AASN A 61 2901 3704 2497 -1862 -440 1083 C ATOM 1163 CB BASN A 61 7.016 4.118 22.260 0.50 26.04 C ANISOU 1163 CB BASN A 61 3226 4291 2376 -1605 -554 824 C ATOM 1168 CG AASN A 61 5.499 3.653 22.494 0.50 27.33 C ANISOU 1168 CG AASN A 61 3048 4420 2914 -1388 -585 598 C ATOM 1169 CG BASN A 61 7.882 2.975 22.608 0.50 27.64 C ANISOU 1169 CG BASN A 61 3195 4695 2612 -1576 -444 650 C ATOM 1170 OD1AASN A 61 4.659 3.204 21.697 0.50 27.73 O ANISOU 1170 OD1AASN A 61 3349 4200 2986 -1314 -644 873 O ATOM 1171 OD1BASN A 61 8.908 3.141 23.291 0.50 30.84 O ANISOU 1171 OD1BASN A 61 3734 4991 2990 -1345 -880 129 O ATOM 1172 ND2AASN A 61 5.182 4.096 23.716 0.50 34.27 N ANISOU 1172 ND2AASN A 61 3736 5474 3811 -832 -539 234 N ATOM 1173 ND2BASN A 61 7.512 1.797 22.152 0.50 34.10 N ANISOU 1173 ND2BASN A 61 5062 4644 3251 -1031 -186 246 N I put link in .def file like this: apply_cif_link { data_link = "NAG-ASN" residue_selection_1 = chain A and resname ANAG and resid 2061 residue_selection_2 = chain A and resname AASN and resid 61 } apply_cif_link { data_link = "NAG-ASN" residue_selection_1 = chain A and resname BNAG and resid 2061 residue_selection_2 = chain A and resname BASN and resid 61 } but when I run the .def file, I got an error message: couldn't find :residue_selection_1 = chain A and resname ANAG and resid 2061 Is there any wrong in my file? Thank you very much! yamei The information in this e-mail is intended only for the person to whom it is addressed. If you believe this e-mail was sent to you in error and the e-mail contains patient information, please contact the Partners Compliance HelpLine at http://www.partners.org/complianceline . If the e-mail was sent to you in error but does not contain patient information, please contact the sender and properly dispose of the e-mail.