Objective: To learn the chemical constituents of the butanol fraction of Euscaphis japonica. Method: Various column chromatographies (CCs) including MCI CC

RP-18 CC and semipreparative HPLC were employed for the isolation and purification of the constituents and their structures were determined by spectral analysis and chemical evidence. Result: Seven compounds were isolated and identified as corchoionoside C (1)

ellagic acid (2)

junipetrioloside A (3)

3

3'-di-O-methylellagic acid-4'-O-β-D-glucopyranoside (4)

3

3'-di-O-methylellagic acid-4'-O-α-D-arabinfuranoside (5)

3

3'-di-O-methylellagic acid-4'-O-β-D-xylopyraoside (6) and 3

3'-di-O-methylellagic acid (7). Conclusion: All compounds were isolated from E. japonica for the first time.