| Strychnine | −7.895 ± 0.013 | −9.066 ± 0.009 | −7.574 ± 0.006 | −8.43 ± 0.006 | −8.478 ± 0.004 |
| 2-[3-ethenyl-5-(methoxycarbonyl)-2-{[(2S,3R,4S,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxy}-3,4-dihydro-2H-pyran-4-yl]acetic acid | −5.647 ± 0.008 | −7.499 ± 0.009 | −6.905 ± 0.008 | −6.349 ± 0.014 | −6.712 ± 0.467 |
| 3,4-Bis(4-propan-2-ylanilino)cyclobut-3-ene-1,2-dione / BCD | −7.869 ± 0.003 | −9.191 ± 0.09 | −8.407 ± 0.014 | −10.198 ± 0.011 | −7.788 ± 0.193 |
| (1S,3R,4S,5R)-3,5-bis({[(2E)-3-(3,4-dihydroxyphenyl)prop-2-enoyl]oxy})-1,4-dihydroxycyclohexane-1-carboxylic acid / DCA | −7.143 ± 0.031 | −9.940 ± 0.032 | −8.766 ± 0.024 | −8.704 ± 0.016 | −8.274 ± 0.335 |
| Choline | −3.302 ± 0.014 | −3.703 ± 0.024 | −3.349 ± 0.003 | −3.502 ± 0.006 | −3.383 ± 0.007 |
| D-(+)-Pipecolinic acid | −5.63 ± 0.006 | −5.615 ± 0.005 | −5.005 ± 0.008 | −6.196 ± 0.033 | −4.939 ± 0.015 |
| D-(+)-Proline | −5.439 ± 0.008 | −5.087 ± 0.006 | −4.457 ± 0.028 | −5.46 ± 0.012 | −4.529 ± 0.009 |
| N6-threonylcarbamoyladenosine | −6.324 ± 0.031 | −8.753 ± 0.021 | −7.6 ± 0.002 | −7.684 ± 0.009 | −7.127 ± 0.046 |
| Koumine | −6.786 ± 0.003 | −7.904 ± 0.007 | −8.114 ± 0.007 | −8.829 ± 0.004 | −7.966 ± 0.007 |
| Quinine | −6.46 ± 0.024 | −8.271 ± 0.07 | −7.015 ± 0 | −7.472 ± 0.016 | −8.008 ± 0.006 |
| Brucine | −7.94 ± 0.004 | −9.427 ± 0.004 | −8.089 ± 0.003 | −8.044 ± 0.11 | −7.905 ± 0.006 |
| N-[1-(6,7-dimethoxy-1,2,3,4-tetrahydroisoquinolin-1-ylidene)-4-methyl-2-oxopentan-3-yl]benzamide / NTB | −6.868 ± 0.01 | −8.541 ± 0.325 | −8.399 ± 0.186 | −9.584 ± 0.009 | −7.631 ± 0.034 |
| (E)-methyl 2-((Z)-3-ethylidene-1,2,3,4,6,7,12,12b-octahydroindolo[2,3-a]quinolizin-2-yl) -3-hydroxyacrylate | −6.907 ± 0.003 | −8.441 ± 0.021 | −7.629 ± 0.012 | −9.326 ± 0.013 | −8.091 ± 0.008 |
| 6-formyl-2,3,3a1,4,5,6,11,12-octahydro-1H-3a,5a-ethanoindolizino [8,1-cd]carbazole-5-carboxylic acid | −6.908 ± 0.006 | −8.631 ± 0.005 | −7.494 ± 0.023 | −8.346 ± 0.006 | −8.426 ± 0.005 |
| 9-ethyl-8-hydroxy-8,9,10,11,11a,12-hexahydro-6H-6,10:11,12a-dimethanoindolo[3,2-b]quinolizin-13-yl acetate | −6.918 ± 0.09 | −8.153 ± 0.009 | −7.214 ± 0.025 | −8.076 ± 0.004 | −7.747 ± 0.003 |
| 1,6-Dihydroxy-7-methyl-1,4a,5,6,7,7a-hexahydrocyclopenta[c]pyran-4-carboxylic acid methyl ester | −5.429 ± 0.002 | −6.972 ± 0.04 | −6.101 ± 0.002 | −6.591 ± 0.007 | −5.708 ± 0.007 |