Chemical Components of Dendrobium loddigesii

Dendrobium loddigesii is used in clinical applications widely.In order to further investigate its effective constituent,seven compounds including shihunine(1),9,10-dihydrophenanthrene-2,4,7-triol(2),moscatin(3),loddigesiinols C(4),moscatilin(5),gigantol(6) and tristin(7) were isolated by silica gel,Sephadex LH-20 and ODS-18 column chromatography from the methanol extract of Dendrobium loddigesii.Their structures were analyzed by MS and NMR spectroscopy.The compounds 2 and 7 were obtained from Dendrobium loddigesii for the first time.