Annulatin is an O-methylated flavonol found in the roots of Pteroxygonum giraldii.[1]

References

  1. ^ Li, Bao-Lin; Yang, Zhan-Jun; Jiang, Lin-Ling; Zhang, Xi-Quan; Gu, Hong-Mei; Wang, Hui-Chun; Tian, Xian-Hua (2009). "ChemInform Abstract: Antioxidant Flavone Glycosides from the Root of Pteroxygonum giraldii". ChemInform. 40 (49). doi:10.1002/chin.200949203.