STUDIES ON THE COMPONENTS OF ESSENTIAL OILS Ⅲ. STUDIES OF CHEMICAL CONSTITUENTS OF THE ESSENTIAL OIL FROM RHODODENDRON RACEMOSUM FRANCH. (Ⅰ) COMPARISON OF THE CONSTITUENTS OF VITEX NEGUNDO L. VAR. CANNABIFOLIA(SIEB. ET ZUCC.) HAND-M

The chemical constituents of the essential oil obtained from the leaves of (Ⅰ) werestudied by GC and GC-MS. α-pinene, β-pinene, p-cymene, 1,8-cineole, bornyl acetate, trans-caryophyllene and caryophyllene oxide were identified as the main components, the contents of these were determined with an electronic integrator.The constituents of the essential oil from (Ⅰ) were compared with those from (Ⅱ).and (Ⅲ). It was found that the components were very similar, the main difference was that the former contained trans-caryophyllene rather than the E-isomer and had a higher content of bornyl acetate, while the later two contained sabinene and none of them contained β-pinene.(Ⅰ) and (Ⅱ), (Ⅲ) are of different families, but they possess similar therapeutic action on bronchitis, probably due to the similarity of their chemical constituents.