Conventional one-dimensional NMR methods and two-dimensional shift-correlat
ed NMR experiments (COSY, HMQC, HMBC) were used for H-1 and C-13 chemical s
hift assignments of two naphthoquinone dimers tectol and tecomaquinone I is
olated from Lippia sidoides. Copyright (C) 1999 John Wiley & Sons, Ltd.