Chemical Constituents of the Barks of Litsea rubescens

phytochemical investigation of the ethanol extract from the barks of Litsea rubescens resulted in the isolation of three new compounds, 3 α ,7 β -diacetyl-8 β -methyloctahydro-4 β -methyl formate ( 1 ), (–)-N-methoxycarbonylorientailine ( 3 ), and 9-O-[4-O-acetyl-α-L-rhamnopyranosyl-(1→6)-β-Dglucopyranosyl]-3,4-dimethoxycinnamic acid ( 5 ), together with two known compounds, 3 α ,7 β -dihydroxy-8 β -methyloctahydro-4 β -methyl formate ( 2 ) and (–)-orientailine ( 4 ). The structures of the three new compounds were elucidated on the basis of 1D, 2D NMR (COSY, HMQC, HMBC, and NOESY), and mass spectral analyses.