Dep.of Med.Nat.Prod.Chem.,Hebmu. Exercises of Org.Anal. 64.9(s,1H).67.0(m,4H).What is the structure of H? 初稿2005/5/22 修改2015/4/13 Li Li-GengDep. of Med. Nat. Prod. Chem., Hebmu. Exercises of Org .Anal. 8 δ4.9(s,1H), δ7.0(m,4H). What is the structure of H? 初稿 2005/5/22 修改 2015/4/13 Li Li-Geng