LIMONOIDS FROM MELIA AZEDARACH LINN. VAR. JAPONICA MAKINO. II. THE NATURAL HYDROXYL PRECURSOR OF SENDANIN

Abstract Because sendanin is an artifact which has been isolated from M. azedarach Linn. var. japonica Makino only after the acetylation of crude limonoid fraction, the structure of the natural hydroxyl precursor was studied. The chemical and spectroscopic evidence revealed that it was an epimeric mixture of the hemiacetal 5.