C7 H8 N O2 138.144 Trigonelline N 1 Corina N 2025-05-01 9QWY N 2026-04-24 PDBE REL 1-methylpyridin-1-ium-3-carboxylic acid HETAIN A1JBP non-polymer O1 0 8.943 -2.328 23.138 1 N O1 A1JBP N 2.193 -1.506 0.002 1 N O C1 0 8.324 -3.414 23.252 1 N C1 A1JBP N 1.928 -0.320 0.002 2 N C O2 0 7.211 -3.513 23.820 1 N O2 A1JBP N 2.919 0.592 -0.003 3 N O C2 0 8.890 -4.649 22.598 1 Y C2 A1JBP N 0.518 0.121 0.001 4 N C C3 0 8.036 -5.617 22.088 1 Y C3 A1JBP N 0.199 1.484 0.001 5 N C C4 0 8.525 -6.717 21.407 1 Y C4 A1JBP N -1.137 1.845 0.001 6 N C C5 0 9.871 -6.857 21.247 1 Y C5 A1JBP N -2.105 0.857 -0.000 7 N C N1 1 10.700 -5.929 21.772 1 Y N1 A1JBP N -1.775 -0.421 0.001 8 N N C6 0 10.247 -4.818 22.427 1 Y C6 A1JBP N -0.519 -0.814 -0.005 9 N C C7 0 12.157 -6.089 21.550 1 N C7 A1JBP N -2.837 -1.430 0.000 10 N C H1 0 6.937 -2.659 24.132 1 N H8 A1JBP N 3.826 0.255 -0.006 11 N H H2 0 6.970 -5.509 22.225 1 N H1 A1JBP N 0.975 2.235 0.002 12 N H H3 0 7.848 -7.457 21.007 1 N H2 A1JBP N -1.421 2.887 0.001 13 N H H4 0 10.271 -7.702 20.706 1 N H3 A1JBP N -3.149 1.136 -0.001 14 N H H5 0 10.942 -4.083 22.805 1 N H4 A1JBP N -0.288 -1.869 -0.004 15 N H H6 0 12.695 -5.261 22.035 1 N H6 A1JBP N -3.100 -1.681 -1.027 16 N H H7 0 12.491 -7.045 21.980 1 N H7 A1JBP N -2.487 -2.325 0.515 17 N H H8 0 12.366 -6.080 20.470 1 N H5 A1JBP N -3.714 -1.035 0.514 18 N H Y 1 N doub Y 2 N sing Y 3 N sing N 4 N sing Y 5 N doub Y 6 N doub Y 7 N sing N 8 N sing N 9 N doub N 10 N sing N 11 N sing N 12 N sing N 13 N sing N 14 N sing N 15 N sing N 16 N sing N 17 N sing N 18 N sing PDBE RCSB InChI=1S/C7H7NO2/c1-8-4-2-3-6(5-8)7(9)10/h2-5H,1H3/p+1 WWNNZCOKKKDOPX-UHFFFAOYSA-O C[n+]1cccc(c1)C(O)=O C[n+]1cccc(c1)C(O)=O C[n+]1cccc(c1)C(=O)O C[n+]1cccc(c1)C(=O)O 1-methylpyridin-1-ium-3-carboxylic acid 1-methylpyridin-1-ium-3-carboxylic acid PDB