Table 2.

Characterization of isoprenylated flavonoids of S. tonkinensis.

NO.	Identification	RT (min)	[M-H]− m/z	Molecular Formula	MS/MS
8	Kurarinone	60.15	437.15	C26H32O6	419.10[M-H-H2O]−, 313.17[M-H-lavandulyl]−, 300.98(1,3A−), 176.96(1,3A−lavandulyl)
9	Sophoradin	66.48	459.09	C30H36O4	403.13[M-H-isopentenyl]−, 205.21(1,3A-), 204.07[1,3A−-H]−, 176.12[1,3A−-H-CO]−, 149.04(1,3A−-isopentenyl)
10	Sophoradochromene	69.82	457.03	C30H34O4	401.08[M-H-isopentenyl]−, 253.08(1,3B−), 205.13(1,3A−), 204.09[1,3A−-H]−, 176.05[1,3A−-H-CO]−, 149.22(1,3A−-isopentenyl)
11	2-(3-Hydroxy-2,2-dimethyl-8-prenyl-6-chromanyl)-7-hydroxy-8-prenyl-4-chromanone	71.25	475.14	C30H36O5	419.15[M-H-isopentenyl]−, 269.21(1,3B−), 203.11(1,3A−), 147.14(1,3A−-isopentenyl)
12	Sophoranone	77.49	459.05	C30H36O4	403.08[M-H-isopentenyl]−, 255.19 (1,3B−), 203.14(1,3A−), 147.06(1,3A−-isopentenyl)
13	Sophoranochromene	78.26	457.1	C30H34O4	401.21[M-H- isopentenyl]−, 253.11(1,3B−), 203.13(1,3A−), 147.06(1,3A−-isopentenyl)