Lonicera japonica
"Lonicera japonica" contains methyl caffeate, 3,4-di-O-caffeoylquinic acid, methyl 3,4-di-O-caffeoylquinate, protocatechuic acid, methyl chlorogenic acid, and luteolin. The two biflavonoids, 3′-O-methyl loniflavone and loniflavone, along with luteolin and chrysin, can be isolated from the leaves. Other phenolic compounds present in the plant are hyperoside, chlorogenic acid, and caffeic acid. The two secoiridoid glycosides, loniceracetalides A and B, can be isolated, together with 10 known iridoid glycosides, from the flower buds. The plant also contains the saponins loniceroside A and B and the antiinflammatory loniceroside C.