Table 2. The phytoconstituents of the aqueous extract of Strychnos ligustrina wood based on LC-MS/MS analysis

Compound	Retention time (min)	Molecular weight (g/mol)	Relative abundance (%)			Similarity index
			Sapwood	Bark	Heartwood
Strychnine	7.706	335.16	15.187	0.063	16.261	93.5
Choline	1.237	104.09	13.889	2.841	15.094	95.5
Brucine	7.300	394.19	11.629	35.686	13.982	72.2
Proline	1.333	115.06	5.825	0.478	5.527	98.1
9-Ethyl-8-hydroxy-8,9,10,11,11a,12-hexahydro-6H-6,10:11,12a-dimethanoindolo[3,2-b]quinolizin-13-yl acetate	6.027	352.18	0.104	0.742	4.311	74.4
1,6-Dihydroxy-7-methyl-1,4a,5,6,7,7a-hexahydrocyclopenta[c]pyran-4-carboxylic acid methyl ester	7.171	228.10	0.018	0.006	2.33	75.3
N6-threonylcarbamoyladenosine	7.443	412.13	1.336	0.02	1.3	92.7
Pipecolinic acid	1.418	129.07	0.993	0.123	1.193	92.5
3,4-Bis(4-propan-2-ylanilino)cyclobut-3-ene-1,2-dione / BCD	7.345	348.18	1.246	4.233	1.169	90.4
(E)-methyl-2-((Z)-3-ethylidene-1,2,3,4, 6,7,12,12b-octahydroindolo[2,3-a] quinolizin-2-yl)-3-hydroxy acrylate	6.322	352.18	0.038	5.153	0.926	80.6
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	8.048	404.13	1.043	0.434	0.742	97.9
Koumine	5.984	306.17	0.895	7.243	0.525	94.2
(1S,3R,4S,5R)-3,5-bis({[(2E)-3-(3,4-dihydroxyphenyl)prop-2-enoyl]oxy})-1,4-dihydroxycyclohexane-1-carboxylic acid / DCA	10.000	516.12	0.51	0.097	0.463	97.1
6-formyl-2,3,3a1,4,5,6,11,12-octahydro-1H-3a,5a-ethanoindolizino [8,1-cd]carbazole-5-carboxylic acid	5.428	352.1	4.962	0.031	0.045	74.1
Quinine	7.568	324.18	0.004	2.783	0.002	93.8
N-[1-(6,7-dimethoxy-1,2,3,4-tetrahydroisoquinoline-1-ylidene)-4-methyl-2-oxopentan-3-yl]benzamide / NTB	10.836	408.21	0.000	22.331	0.001	76.1