Finding intermodel H-bonds Finding intramodel H-bonds Constraints relaxed by 0.4 angstroms and 20 degrees Models used: #0 1e3e_A.cif H-bonds (donor, acceptor, hydrogen, D..A dist, D-H..A dist): LYS 5.A N THR 2.A O no hydrogen 3.272 N/A LYS 5.A NZ GLN 3.A O no hydrogen 3.515 N/A ILE 7.A N VAL 28.A O no hydrogen 2.993 N/A CYS 9.A N ILE 26.A O no hydrogen 3.053 N/A CYS 9.A SG LYS 10.A O no hydrogen 3.785 N/A ALA 11.A N GLU 24.A O no hydrogen 3.162 N/A ALA 12.A N PHE 150.A O no hydrogen 3.061 N/A ILE 13.A N CYS 22.A O no hydrogen 3.014 N/A ALA 14.A N VAL 63.A O no hydrogen 3.132 N/A GLY 18.A N THR 53.A O no hydrogen 2.829 N/A SER 19.A OG THR 17.A O no hydrogen 2.920 N/A LEU 21.A N ASN 358.A OD1 no hydrogen 3.015 N/A CYS 22.A N ILE 13.A O no hydrogen 3.203 N/A GLU 24.A N ALA 11.A O no hydrogen 3.066 N/A ILE 26.A N CYS 9.A O no hydrogen 2.940 N/A GLU 27.A N THR 135.A O no hydrogen 3.006 N/A VAL 28.A N ILE 7.A O no hydrogen 2.787 N/A SER 29.A N ARG 133.A O no hydrogen 3.175 N/A LYS 32.A N GLU 35.A OE1 no hydrogen 2.758 N/A LYS 32.A NZ ASP 129.A OD2 no hydrogen 3.122 N/A GLU 35.A N LYS 32.A O no hydrogen 3.089 N/A VAL 36.A N VAL 156.A O no hydrogen 2.930 N/A ARG 37.A N SER 75.A O no hydrogen 3.058 N/A ARG 37.A NE GLU 74.A OE1 no hydrogen 2.542 N/A ARG 37.A NH1 LYS 5.A O no hydrogen 3.211 N/A ARG 37.A NH2 LYS 5.A O no hydrogen 3.248 N/A ARG 37.A NH2 GLU 74.A OE2 no hydrogen 3.164 N/A ILE 38.A N THR 154.A O no hydrogen 2.895 N/A GLN 39.A N ILE 72.A O no hydrogen 2.747 N/A VAL 40.A N GLN 152.A O no hydrogen 2.800 N/A ILE 41.A N ALA 70.A O no hydrogen 3.114 N/A ALA 42.A N ALA 70.A O no hydrogen 3.468 N/A THR 43.A N LEU 374.A O no hydrogen 2.964 N/A THR 43.A OG1 GLU 68.A O no hydrogen 2.891 N/A THR 43.A OG1 SER 149.A OG no hydrogen 3.006 N/A CYS 44.A N GLU 68.A O no hydrogen 3.239 N/A CYS 44.A SG GLU 68.A OE2 no hydrogen 3.865 N/A CYS 44.A SG THR 372.A O no hydrogen 3.659 N/A CYS 46.A N ASP 49.A OD2 no hydrogen 3.008 N/A CYS 46.A SG THR 48.A OG1 no hydrogen 3.591 N/A CYS 46.A SG HIS 67.A NE2 no hydrogen 3.709 N/A ASP 49.A N CYS 46.A O no hydrogen 2.716 N/A ASN 51.A N PRO 47.A O no hydrogen 2.909 N/A ALA 52.A N ASP 49.A O no hydrogen 3.074 N/A THR 53.A N ILE 50.A O no hydrogen 2.761 N/A THR 53.A OG1 ILE 50.A O no hydrogen 2.587 N/A ASP 54.A N ASN 51.A O no hydrogen 3.207 N/A LYS 56.A N ASP 54.A OD1 no hydrogen 3.005 N/A LYS 57.A N ASP 54.A O no hydrogen 2.941 N/A LYS 57.A NZ LYS 299.A O no hydrogen 3.404 N/A VAL 63.A N ALA 14.A O no hydrogen 3.283 N/A VAL 64.A N TYR 142.A O no hydrogen 3.070 N/A GLY 66.A N ASP 49.A OD1 no hydrogen 3.006 N/A HIS 67.A ND1 ASP 49.A OD1 no hydrogen 3.028 N/A ALA 70.A N ALA 42.A O no hydrogen 3.303 N/A GLY 71.A N VAL 89.A O no hydrogen 3.071 N/A ILE 72.A N GLN 39.A O no hydrogen 2.993 N/A VAL 73.A N ASP 87.A O no hydrogen 3.051 N/A GLU 74.A N ARG 37.A O no hydrogen 2.916 N/A SER 75.A OG GLU 74.A OE1 no hydrogen 2.681 N/A GLY 77.A N GLU 35.A O no hydrogen 3.007 N/A VAL 80.A N GLY 77.A O no hydrogen 3.324 N/A LYS 84.A N ASP 87.A OD2 no hydrogen 3.040 N/A LYS 84.A NZ ASP 87.A OD1 no hydrogen 2.832 N/A LYS 84.A NZ ASP 87.A OD2 no hydrogen 3.508 N/A GLY 86.A N VAL 73.A O no hydrogen 3.199 N/A ASP 87.A N LYS 84.A O no hydrogen 3.319 N/A LYS 88.A NZ ASP 166.A O no hydrogen 2.945 N/A LYS 88.A NZ ALA 168.A O no hydrogen 2.865 N/A VAL 89.A N GLY 71.A O no hydrogen 3.057 N/A ILE 90.A N ALA 162.A O no hydrogen 3.147 N/A PHE 92.A N ASN 160.A O no hydrogen 3.141 N/A GLN 96.A N ALA 159.A O no hydrogen 3.210 N/A GLN 96.A NE2 ASP 328.A OD2 no hydrogen 3.015 N/A LYS 98.A NZ ASP 328.A OD1 no hydrogen 3.256 N/A ARG 99.A NE CYS 97.A O no hydrogen 3.237 N/A LEU 104.A N CYS 100.A O no hydrogen 3.161 N/A LEU 104.A N LYS 101.A O no hydrogen 3.316 N/A SER 105.A N LEU 102.A O no hydrogen 3.339 N/A LEU 107.A N SER 105.A OG no hydrogen 2.992 N/A ASN 109.A ND2 PHE 320.A O no hydrogen 2.905 N/A ASN 109.A ND2 TRP 324.A O no hydrogen 3.088 N/A LEU 110.A N THR 108.A OG1 no hydrogen 3.266 N/A LYS 113.A NZ GLN 124.A OE1 no hydrogen 2.827 N/A LEU 114.A N CYS 111.A O no hydrogen 3.225 N/A ARG 115.A N ASP 123.A OD2 no hydrogen 2.831 N/A ASN 116.A N ASP 123.A OD2 no hydrogen 3.179 N/A LYS 118.A N ASN 116.A OD1 no hydrogen 2.980 N/A TYR 119.A N ASN 116.A OD1 no hydrogen 2.861 N/A ILE 122.A N TYR 119.A O no hydrogen 3.272 N/A ASP 123.A N PRO 120.A O no hydrogen 3.187 N/A GLN 124.A N ASP 123.A OD1 no hydrogen 2.659 N/A GLN 124.A NE2 PHE 93.A O no hydrogen 3.045 N/A GLU 125.A N GLU 125.A OE1 no hydrogen 2.396 N/A MET 127.A N THR 131.A O no hydrogen 3.140 N/A ARG 130.A N MET 127.A O no hydrogen 2.779 N/A THR 131.A N ASP 129.A OD1 no hydrogen 3.136 N/A THR 131.A OG1 ASP 129.A OD1 no hydrogen 2.581 N/A SER 132.A OG PHE 134.A O no hydrogen 3.543 N/A SER 132.A OG ILE 141.A O no hydrogen 2.608 N/A ARG 133.A N HIS 143.A NE2 no hydrogen 3.263 N/A PHE 134.A N SER 132.A OG no hydrogen 3.046 N/A CYS 136.A N ARG 139.A O no hydrogen 3.015 N/A CYS 136.A SG GLU 25.A O no hydrogen 3.746 N/A LYS 137.A NZ GLU 24.A OE1 no hydrogen 3.398 N/A LYS 137.A NZ GLU 24.A OE2 no hydrogen 3.458 N/A ILE 141.A N PHE 134.A O no hydrogen 3.342 N/A TYR 142.A N PRO 62.A O no hydrogen 2.867 N/A HIS 143.A N GLU 125.A O no hydrogen 3.072 N/A PHE 144.A N SER 148.A OG no hydrogen 2.845 N/A GLY 146.A N GLN 124.A O no hydrogen 3.142 N/A VAL 147.A N PHE 144.A O no hydrogen 2.927 N/A SER 148.A OG VAL 64.A O no hydrogen 2.804 N/A SER 149.A N GLY 66.A O no hydrogen 2.985 N/A SER 149.A OG THR 43.A OG1 no hydrogen 3.006 N/A PHE 150.A N LEU 65.A O no hydrogen 3.135 N/A SER 151.A OG TYR 153.A O no hydrogen 3.106 N/A GLN 152.A N LYS 10.A O no hydrogen 3.311 N/A THR 154.A N ILE 38.A O no hydrogen 3.116 N/A THR 154.A OG1 VAL 147.A O no hydrogen 2.958 N/A THR 154.A OG1 SER 148.A O no hydrogen 3.273 N/A VAL 156.A N VAL 36.A O no hydrogen 2.970 N/A GLU 158.A N CYS 34.A O no hydrogen 3.274 N/A ALA 159.A N SER 157.A OG no hydrogen 3.320 N/A ASN 160.A N SER 157.A O no hydrogen 2.857 N/A ASN 160.A ND2 PHE 92.A O no hydrogen 3.185 N/A ASN 160.A ND2 GLN 124.A OE1 no hydrogen 3.224 N/A ALA 162.A N ILE 90.A O no hydrogen 3.212 N/A ARG 163.A NH2 ASP 166.A OD1 no hydrogen 3.475 N/A VAL 164.A N LYS 88.A O no hydrogen 2.998 N/A GLU 167.A N ASP 165.A OD1 no hydrogen 2.478 N/A ALA 168.A N ASP 165.A O no hydrogen 3.230 N/A GLU 171.A N ASN 169.A OD1 no hydrogen 2.973 N/A ARG 172.A N ASN 169.A O no hydrogen 2.933 N/A ARG 172.A NH1 GLU 171.A O no hydrogen 2.893 N/A VAL 173.A N ASN 169.A O no hydrogen 3.052 N/A CYS 174.A SG LEU 170.A O no hydrogen 3.687 N/A LEU 175.A N ARG 172.A O no hydrogen 3.144 N/A ILE 176.A N VAL 173.A O no hydrogen 2.994 N/A GLY 177.A N CYS 174.A O no hydrogen 3.116 N/A CYS 178.A SG HIS 67.A NE2 no hydrogen 3.643 N/A GLY 179.A N GLU 68.A OE1 no hydrogen 3.061 N/A PHE 180.A N LEU 175.A O no hydrogen 3.260 N/A SER 181.A OG ILE 176.A O no hydrogen 2.826 N/A SER 182.A N CYS 178.A O no hydrogen 3.048 N/A SER 182.A OG CYS 178.A O no hydrogen 2.740 N/A GLY 183.A N GLY 179.A O no hydrogen 3.322 N/A TYR 184.A N PHE 180.A O no hydrogen 3.005 N/A GLY 185.A N SER 181.A O no hydrogen 3.001 N/A ALA 186.A N SER 182.A O no hydrogen 3.247 N/A ALA 187.A N GLY 183.A O no hydrogen 3.449 N/A ILE 188.A N TYR 184.A O no hydrogen 3.257 N/A ASN 189.A N GLY 185.A O no hydrogen 2.666 N/A ASN 189.A ND2 GLY 322.A O no hydrogen 3.177 N/A THR 190.A N GLY 185.A O no hydrogen 3.381 N/A THR 190.A OG1 THR 319.A OG1 no hydrogen 2.766 N/A ALA 191.A N ALA 186.A O no hydrogen 2.763 N/A LYS 192.A NZ ASN 189.A O no hydrogen 3.278 N/A VAL 193.A N ALA 187.A O no hydrogen 3.234 N/A THR 194.A OG1 TYR 268.A OH no hydrogen 3.119 N/A GLY 196.A N GLY 219.A O no hydrogen 2.946 N/A SER 197.A N THR 194.A O no hydrogen 3.311 N/A SER 197.A OG THR 194.A O no hydrogen 2.655 N/A THR 198.A N ASP 267.A OD2 no hydrogen 3.011 N/A CYS 199.A N ARG 222.A O no hydrogen 2.917 N/A ALA 200.A N TYR 268.A O no hydrogen 3.063 N/A VAL 201.A N ILE 224.A O no hydrogen 2.967 N/A PHE 202.A N LEU 270.A O no hydrogen 3.074 N/A GLY 203.A N ILE 226.A O no hydrogen 2.977 N/A LEU 204.A N ASP 227.A OD2 no hydrogen 2.925 N/A LEU 209.A N GLY 205.A O no hydrogen 2.901 N/A SER 210.A N CYS 206.A O no hydrogen 3.030 N/A SER 210.A OG CYS 206.A O no hydrogen 2.784 N/A ALA 211.A N VAL 207.A O no hydrogen 2.986 N/A ILE 212.A N GLY 208.A O no hydrogen 3.140 N/A ILE 213.A N LEU 209.A O no hydrogen 3.156 N/A GLY 214.A N SER 210.A O no hydrogen 3.005 N/A CYS 215.A N ALA 211.A O no hydrogen 2.944 N/A CYS 215.A SG ALA 211.A O no hydrogen 3.377 N/A LYS 216.A N ILE 212.A O no hydrogen 3.069 N/A ILE 217.A N ILE 213.A O no hydrogen 3.014 N/A ALA 218.A N GLY 214.A O no hydrogen 2.977 N/A GLY 219.A N LYS 216.A O no hydrogen 2.928 N/A ALA 220.A N CYS 215.A O no hydrogen 3.193 N/A SER 221.A N SER 197.A O no hydrogen 2.987 N/A SER 221.A OG GLY 196.A O no hydrogen 3.110 N/A SER 221.A OG SER 197.A O no hydrogen 3.560 N/A ARG 222.A NE ASP 243.A OD1 no hydrogen 3.107 N/A ARG 222.A NH1 LEU 261.A O no hydrogen 3.275 N/A ARG 222.A NH2 ASP 243.A OD2 no hydrogen 3.287 N/A ILE 223.A N THR 242.A OG1 no hydrogen 3.105 N/A ILE 224.A N CYS 199.A O no hydrogen 2.908 N/A ALA 225.A N ASP 243.A O no hydrogen 2.924 N/A ILE 226.A N VAL 201.A O no hydrogen 3.076 N/A ASP 227.A N LEU 245.A O no hydrogen 3.313 N/A ASN 229.A N ASP 227.A OD1 no hydrogen 2.924 N/A GLU 231.A N ASN 229.A OD1 no hydrogen 3.085 N/A LYS 232.A N ASN 229.A O no hydrogen 3.076 N/A PHE 233.A N GLY 230.A O no hydrogen 3.181 N/A LYS 235.A NZ LEU 346.A O no hydrogen 2.918 N/A LYS 237.A N PHE 233.A O no hydrogen 2.898 N/A ALA 238.A N PRO 234.A O no hydrogen 3.137 N/A LEU 239.A N ALA 236.A O no hydrogen 3.135 N/A GLY 240.A N LYS 237.A O no hydrogen 3.156 N/A ALA 241.A N ALA 236.A O no hydrogen 3.207 N/A THR 242.A N ILE 223.A O no hydrogen 2.951 N/A THR 242.A OG1 ILE 223.A O no hydrogen 3.202 N/A THR 242.A OG1 ASP 243.A OD1 no hydrogen 2.966 N/A ASP 243.A N ILE 223.A O no hydrogen 3.336 N/A LEU 245.A N ALA 225.A O no hydrogen 2.965 N/A ASN 246.A ND2 ILE 228.A O no hydrogen 3.278 N/A ARG 248.A N ASN 246.A OD1 no hydrogen 2.921 N/A GLU 249.A N ASN 246.A O no hydrogen 3.063 N/A LEU 250.A N PRO 247.A O no hydrogen 3.454 N/A LYS 252.A NZ GLU 260.A OE2 no hydrogen 2.745 N/A GLN 255.A N GLN 255.A OE1 no hydrogen 2.844 N/A GLN 255.A NE2 ASP 284.A OD2 no hydrogen 2.892 N/A ASP 256.A N PRO 253.A O no hydrogen 2.918 N/A VAL 257.A N PRO 253.A O no hydrogen 3.257 N/A ILE 258.A N VAL 254.A O no hydrogen 3.012 N/A THR 259.A N GLN 255.A O no hydrogen 2.962 N/A THR 259.A OG1 GLN 255.A O no hydrogen 2.987 N/A GLU 260.A N ASP 256.A O no hydrogen 3.193 N/A LEU 261.A N VAL 257.A O no hydrogen 3.057 N/A THR 262.A N ILE 258.A O no hydrogen 3.166 N/A THR 262.A OG1 ILE 258.A O no hydrogen 3.063 N/A ALA 263.A N GLU 260.A O no hydrogen 3.141 N/A GLY 264.A N THR 259.A O no hydrogen 2.900 N/A VAL 266.A N CYS 285.A O no hydrogen 3.023 N/A ASP 267.A N THR 198.A O no hydrogen 3.099 N/A TYR 268.A N THR 198.A O no hydrogen 3.282 N/A TYR 268.A OH THR 194.A OG1 no hydrogen 3.119 N/A SER 269.A N SER 292.A O no hydrogen 2.971 N/A SER 269.A OG ALA 282.A O no hydrogen 2.735 N/A LEU 270.A N ALA 200.A O no hydrogen 2.953 N/A ASP 271.A N THR 294.A O no hydrogen 3.174 N/A CYS 272.A N PHE 202.A O no hydrogen 2.698 N/A ALA 273.A N ASP 271.A OD1 no hydrogen 2.715 N/A GLY 274.A N ASP 271.A OD1 no hydrogen 2.756 N/A THR 275.A N THR 278.A OG1 no hydrogen 2.760 N/A THR 275.A OG1 THR 278.A OG1 no hydrogen 3.224 N/A THR 278.A N THR 275.A OG1 no hydrogen 3.215 N/A THR 278.A OG1 ASP 271.A OD1 no hydrogen 3.472 N/A THR 278.A OG1 ASP 271.A OD2 no hydrogen 2.854 N/A THR 278.A OG1 THR 275.A O no hydrogen 2.965 N/A THR 278.A OG1 THR 275.A OG1 no hydrogen 3.224 N/A LEU 279.A N THR 275.A O no hydrogen 3.038 N/A LYS 280.A N ALA 276.A O no hydrogen 3.466 N/A ALA 281.A N GLN 277.A O no hydrogen 3.094 N/A ALA 282.A N THR 278.A O no hydrogen 2.850 N/A ASP 284.A N LYS 280.A O no hydrogen 3.099 N/A CYS 285.A N ALA 281.A O no hydrogen 2.990 N/A CYS 285.A SG ALA 281.A O no hydrogen 3.616 N/A CYS 285.A SG ALA 282.A O no hydrogen 3.718 N/A THR 286.A N VAL 283.A O no hydrogen 3.232 N/A THR 286.A OG1 VAL 283.A O no hydrogen 2.926 N/A VAL 287.A N VAL 266.A O no hydrogen 2.955 N/A GLY 289.A N LEU 312.A O no hydrogen 3.013 N/A TRP 290.A NE1 ASP 267.A OD1 no hydrogen 3.036 N/A SER 292.A N ASP 267.A O no hydrogen 3.133 N/A CYS 293.A N SER 315.A O no hydrogen 3.148 N/A CYS 293.A SG SER 269.A OG no hydrogen 3.749 N/A THR 294.A N SER 269.A O no hydrogen 2.954 N/A THR 294.A OG1 ASN 317.A OD1 no hydrogen 2.859 N/A VAL 295.A N ASN 317.A O no hydrogen 2.769 N/A VAL 296.A N ASP 271.A O no hydrogen 3.068 N/A GLY 297.A N ASP 271.A O no hydrogen 3.015 N/A LYS 299.A N GLY 274.A O no hydrogen 2.980 N/A ASP 309.A N PRO 306.A O no hydrogen 3.313 N/A ILE 311.A N THR 307.A O no hydrogen 3.288 N/A LEU 312.A N VAL 308.A O no hydrogen 3.076 N/A GLY 313.A N VAL 310.A O no hydrogen 3.137 N/A ARG 314.A N ASP 309.A O no hydrogen 3.299 N/A ARG 314.A NE THR 286.A O no hydrogen 3.219 N/A ARG 314.A NH2 THR 286.A O no hydrogen 2.950 N/A SER 315.A N GLY 291.A O no hydrogen 3.192 N/A ASN 317.A N CYS 293.A O no hydrogen 3.005 N/A ASN 317.A ND2 THR 190.A O no hydrogen 3.379 N/A THR 319.A N VAL 295.A O no hydrogen 3.105 N/A THR 319.A OG1 THR 190.A OG1 no hydrogen 2.766 N/A GLY 323.A N PHE 320.A O no hydrogen 3.169 N/A TRP 324.A N PHE 321.A O no hydrogen 3.414 N/A TRP 324.A NE1 SER 181.A O no hydrogen 3.136 N/A LYS 325.A NZ CYS 103.A O no hydrogen 2.939 N/A LYS 325.A NZ SER 105.A O no hydrogen 2.962 N/A LYS 325.A NZ THR 108.A O no hydrogen 2.968 N/A SER 326.A OG ALA 94.A O no hydrogen 2.706 N/A ASP 328.A N GLN 96.A OE1 no hydrogen 3.204 N/A SER 329.A N LYS 325.A O no hydrogen 2.978 N/A SER 329.A OG LYS 325.A O no hydrogen 3.346 N/A VAL 330.A N SER 326.A O no hydrogen 3.177 N/A LEU 333.A N SER 329.A O no hydrogen 3.121 N/A LEU 333.A N VAL 330.A O no hydrogen 3.192 N/A VAL 334.A N VAL 330.A O no hydrogen 3.249 N/A SER 335.A N PRO 331.A O no hydrogen 3.174 N/A SER 335.A OG PRO 331.A O no hydrogen 3.462 N/A ASP 336.A N ASN 332.A O no hydrogen 3.097 N/A TYR 337.A N LEU 333.A O no hydrogen 3.167 N/A LYS 338.A N VAL 334.A O no hydrogen 3.265 N/A ASN 339.A N SER 335.A O no hydrogen 3.105 N/A LYS 340.A N TYR 337.A O no hydrogen 2.912 N/A LYS 341.A N ASP 336.A O no hydrogen 2.939 N/A ASP 345.A N ASP 343.A OD1 no hydrogen 2.932 N/A LEU 347.A N LEU 344.A O no hydrogen 3.185 N/A VAL 348.A N ASP 345.A O no hydrogen 3.063 N/A THR 349.A N ARG 371.A O no hydrogen 3.045 N/A THR 349.A OG1 ARG 371.A O no hydrogen 3.478 N/A HIS 350.A N ARG 371.A O no hydrogen 3.460 N/A LEU 352.A N ILE 373.A O no hydrogen 3.046 N/A PHE 354.A N THR 375.A O no hydrogen 3.245 N/A SER 356.A N PRO 353.A O no hydrogen 2.815 N/A ILE 357.A N PHE 354.A O no hydrogen 3.054 N/A ASN 358.A ND2 LEU 21.A O no hydrogen 2.856 N/A ASP 359.A N SER 356.A O no hydrogen 2.701 N/A ILE 361.A N ILE 357.A O no hydrogen 3.152 N/A ASP 362.A N ASN 358.A O no hydrogen 3.268 N/A LEU 363.A N ASP 359.A O no hydrogen 3.044 N/A MET 364.A N ALA 360.A O no hydrogen 3.194 N/A LYS 365.A N ILE 361.A O no hydrogen 3.018 N/A GLU 366.A N LEU 363.A O no hydrogen 3.280 N/A GLY 367.A N MET 364.A O no hydrogen 3.155 N/A LYS 368.A N LEU 363.A O no hydrogen 3.176 N/A LYS 368.A NZ GLU 366.A OE1 no hydrogen 2.693 N/A ILE 370.A N THR 349.A OG1 no hydrogen 3.270 N/A ARG 371.A NE GLU 68.A OE2 no hydrogen 2.909 N/A ARG 371.A NH2 GLU 68.A OE1 no hydrogen 2.811 N/A ILE 373.A N HIS 350.A O no hydrogen 2.922 N/A LEU 374.A N THR 43.A O no hydrogen 2.835 N/A THR 375.A OG1 GLU 171.A OE2 no hydrogen 3.425 N/A