Chemical Constituents from Sambucus adnata and Their Protein-Tyrosine Phosphatase 1B Inhibitory Activities - Tatsunori SASAKIa; Wei LIa; Haruna MORIMURAa; Songpei LIa; Qin LIb; Yoshihisa ASADAc; Kazuo KOIKEa (Chemical & Pharmaceutical Bulletin, 2011)