GC-MS analysis of non-sugar compounds in samples of CO and CO/Cu hydrolysates^a.

Compound	Chemical formula	Description of samples
		1-H	2-H	3-H	4-H
Furfural		+	+	−	−
Benzoic acid, 2-methoxy-, methyl ester		+	+	+	+
2,4-Di-tert-butylphenol		−	+	−	+
Benzoic acid, 4-(dimethoxymethyl)-, methyl ester		−	−	+	+
Oxime-, methoxy-phenyl		−	−	+	+

^aReaction conditions: T = 140 °C, t = 2 h, C_acid = 2%.