"Representative pottery and bronze vessels dating to the Neolithic period and the Shang/Western Zhou Dynasties, showing selective analyses of their contents. (a) Typical Neolithic storage jar from Jiahu (no. T109:65, subperiod II, ca. 6600–6200 B.C.). (b) Lidded he “teapot” from Anyang (Liu Jiazhuang Tomb, no. M1046:2, ca. 1250–1000 B.C.). (c) GC-MS analysis of chloroform extract of a, showing homologous series of n-alkanes. (d) HPLC-MS analysis of chloroform extract of c, showing the presence of β-amyrin; oleanolic acid was attested at 8.9 min." (https://www.pnas.org/content/101/51/17593.full).