CHEMICAL EVALUATION OF BETULA SPECIES IN JAPAN - VI - CONSTITUENTS OFBETULA-SCHMIDTII

The constituents of Betula schmidtii REGAL Were identified as follows. Fresh leaves: methyl opyranosyloxy-3,4-secodammara-4(28),24-dien-3-oa te (betula-schmidtoside A), myricetin 3-O-alpha-L-arabinofuranoside, myricetin 3-O-alpha-L-rhamnopyranoside, myricetin 3O-beta-D-galactopyr anoside, (-)-rhododendrol 4'-O-beta-D-glucopyranoside. Outer bark: be tulin, lupeol, oleanolic acid, betulone, betulonic acid. Inner bark: ( +)-catechin, (3R)-3,5'-dihydroxy-4'-methoxy-3',4 ''-oxo-1,7-diphenyl-1 -heptene, (-)-lyoniresinol 3 alpha-O-beta-D-xylopyranoside, (+)-lyonir esinol 3 alpha-O-beta-D-glucopyranoside, monogynol A, ssioriside, (-)- rhododendrol 4'-O-beta-D-glucopyranoside, (-)-rhododendrol -arabinofu ranosyl-(1-->6)-beta-D-glucopyranoside. Root bark: oleanolic acid 3-c affeate, 27-hydroxyoleanolic acid 27-caffeate. The three compounds wit h asterisks are new.