Table 3. Results of GC-MS analysis of meranti wood extractives

Retention time (min)	Chemical name	Concentration (%)	Fungtional chemical structure	Corrosion inhibitor or accelerator
4.02	1-(4-Acetamidoanilino)-3,7-dimethylbenzo[4,5]imidazo[1,2-a]pyridine-4-carbonitrile	4.75	Cyclic structureO-structureN-structureDouble bond	Corrosion inhibitor
4.15	1,8-Nonadiyne	76.15	Aliphatic structureTriple bond	Corrosion inhibitor
24.53	4-((1E)-3-Hydroxy-1-propenyl)-2-methoxyphenol	0.80	Cyclic structureO-structureDouble bond	Corrosion inhibitor
28.37	Elaol	2.77	Cyclic structureO-structureDouble bond	Very weak acid, corrosion accelerator
28.45	Elaol	2.89	Cyclic structureO-structureDouble bond	Very weak acid, corrosion accelerator
38.70	7-(3,4-Methylenedioxy)-tetrahydrobenzofuranone	0.68	Cyclic structureO-structureDouble bond	Corrosion inhibitor
38.99	Sulfurous acid, cyclohexylmethyl pentadecyl ester	0.73	Cyclic structureO-structureS-structure	Acid, corrosion accelerator
41.77	Methyl hexacosanoate	0.74	Aliphatic structureO-structureDouble bond	Corrosion inhibitor
44.78	3-β,17-β-Dihydroxyandrost-5(10)-ene 17-propionate	0.68	Cyclic structureO-structureDouble bond	Corrosion inhibitor
49.51	γ-Sitosterol	9.80	Cyclic structureO-structureDouble bond	Corrosion inhibitor

GC-MS: gas chromatograph-mass spectrometer.