Abstract
Extraction of the timber of Ptaeroxylon obliquum(Thunb.) Radik. has given the known chromone heteropeucenin methyl ether (I) and also two new chromones, ptaeroxylin and alloptaeroxylin. A fourth compound, obliquin, has been identified as an aesculetin derivative, and a fifth, umtatin, has been characterised but not further studied. The new compounds have been allocated structures and their phytochemical significance is discussed.
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