Three mexicanolides from the root bark of Entandrophragma angolense.

[摘要]：Three new mexicanolide-type rings B,D-seco limonoids (angolensin A(I)-C) were isolated together with four known rings B,D-seco compds., Me angolensate, secomahoganin, 3b-hydroxy-3-deoxycarapin, and xyloccensin K from the root bark of a meliaceous plant Entandrophragma angolense. The structure of these new compds. was elucidated by spectrospcopic means. The antifeedant property of the isolated compds. is also briefly described.

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