[Chemical constituents from Salvia przewalskii Maxim]

The investigation on Salvia przewalskii Maxim was carried out to find the relationship of the constituents and their pharmacological activities. The isolation and purification were performed by various chromatographies such as silica gel, Sephadex LH-20, RP-C18 column chromatography, etc. Further investigation on the fraction of the 95% ethanol extract of Salvia przewalskii Maxim yielded przewalskin Y-1 (1), anhydride of tanshinone-II A (2), sugiol (3), epicryptoacetalide (4), cryptoacetalide (5), arucadiol (6), 1-dehydromiltirone (7), miltirone (8), cryptotanshinone (9), tanshinone II A (10) and isotanshinone-I (11). Their structures were elucidated by the spectral analysis such as NMR (Nuclear Magnetic Resonance) and MS (Mass Spectrometry). Compound 1 is a new compound. Compounds 4 and 5 are mirror isomers (1 : 3). Compounds 4, 5, 6, 8, 11 were isolated from Salvia przewalskii Maxim for the first time.