Comparison of pharmacologically active compounds detected in Gou Teng in 20, 30, 60, 90 V DART-MS spectra. * designates M − OH adduct. Bolded compounds are reported main pharmacologically active compounds.

Gou Teng
#	Compound	Adduct	Adduct mass	Orifice 1 voltage
				20 V	30 V	60 V	90 V
1*	Catechin	–OH	273.0763
	Epicatechin	–OH
1	Catechin	+H	291.0869	X
	Epicatechin	+H
2	Akuammigine	+H	353.1865	X	X	X	X
	Tetrahydroalstonine	+H
3	Hirsuteine	+H	367.2022	X	X	X	X
4	Isomitraphylline	+H	369.1814	X	X	X	X
	Isopteropodine	+H
	Mitraphylline	+H
	Pteropodine	+H
5	Dihydrocorynantheine	+H	369.2178	X	X	X	X
	Hirsutine	+H
6	Corynoxeine	+H	383.1971	X	X	X
	Isocorynoxeine	+H
7*	Campesterol	–OH	383.3678
8	Corynoxine B	+H	385.2127	X	X	X	X
	Isorhynchophylline	+H
	Rhynchophylline	+H
9*	Stigmasterol	–OH	395.3678	X	X
10*	β-Sitosterol	–OH	397.3834	X	X	X	X
9	Stigmasterol	+H	413.3783	X	X
11*	Ursolic acid	–OH	439.3576	X	X	X
11	Ursolic acid	+H	457.3682	X	X	X