3.2. S. arborescens

S. arborescens is a small tree or shrub, commonly used as an ornamental plant native to the Himalaya and Southeastern Asia (He et al., 2011) He et al. (2011, 2012) studied alkaloids, coumarins, and flavonoids from extracts of S. arborescens and isolated one alkaloid, 1-methyl-2-phenyl-4-quinolone 2, six coumarins, umbelliferone 21, scopoletin 24, its glucoside scopolin 31, nodakenetin 53, skimmin 22, and 6,7-dimethoxycoumarin 26, and five flavonoids, quercetin 67, quercetin 3- O -α- L- rhamnoside 68, kaempferol 3,7-di- O -β- D- glucoside 69, isosakuranetin 7- O -neohesperidoside (poncirin) 70, and hesperetin 7- O -rutinoside (hesperidin) 71.