Table 1. Polyphenolic compound contents in OKL extract

Peak	Compound	Retention time	Formula	Concentration (mg/g)
1	Chlorogenic acid	4.937	C16H18O9	25.91±0.22
2	Gallic acid	5.978	C7H6O5	3.94±0.17
3	Catechin	9.190	C15H14O6	52.83±4.27
4	Caffeic acid	11.448	C9H8O4	1.04±0.21
5	p-Coumaric acid	16.050	C9H8O3	16.29±1.10
6	Ferulic acid	18.055	C10H10O4	6.12±0.26