AbstractIn the structure determination of the C2symmetrical tetrastilbene hopeaphenol, isolated fromCarex pumila, the elucidation of the C‐‐C connectivity between equivalent carbons was needed. From an isotopomeric point of view, three isotopomers,12C12C,12C13C and13C13C, are present with respect to the equivalent carbons connecting each other. Among them, the the12C12C species is undetectable and the13C13C species is excluded owing to its low natural abundance. Therefore, only the12C13C isotopomer is detected in13C NMR and this species is not symmetrical. In the H12C13H system, the separate detection of1J(CH) and2J(CH) was achieved by the INEPT‐LSPD, COLOC and HMBC methods to demonstrate the connectivity between the equivalent carbons from the viewpoint of