Table 1.

FT-IR spectrum of arborine and skimmianine compounds.

Compound name	νmax (cm−1)	Functional groups
Arborine	2,925	Aromatic C–H Stretch
	2,855	Aliphatic C–H Stretch
	1,602	C=O
	1,264	C–N Stretch
	1,402	Methyl bend
	765	Aromatic C–H bend out of the plane
Skimmianine	3,116	Aromatic C–H Stretch
	2,937, 2,839	Aliphatic C–H Stretch
	1,616	C=N Stretch
	1,266, 1,056	Phenyl ether C–O
	1,390	Methyl bend
	1,056, 1,192	Furan C–O
	736	C–H bend out of the plane