The ethanolic extract of the seeds of Uvaria tonkinensis (Annonaceae),
collected on Hainan Island, have led to the isolation of a new polyox
ygenated cyclohexane derivative tonkinenin A [1]. The structure of 1 w
as deduced from spectroscopic characteristics and the absolute stereoc
hemistry assigned by the O-methylmandelate ester method. Copyright (C)
1996 Elsevier Science Ltd