A new homoisoflavonoid, 3'-deoxy-4-O-methylsappanol (3, 7-dihydroxy-3- (4-hydroxybenzyl) 4-methoxychroman) was isolated from the wood of Caesalpinia japonica SIEB. et Zucc. (Leguminosae), together with the known compounds, sappanol, episappanol, 4-O-methylsappanol, 4-O-methylepisappanol, sappanones A and B, sappanchalcone, 3-deoxysappanchalcone, isoliquiritigenin, butein, brazilin and protosappanins A, B and C. None of these compounds has previously been isolated from this plant.
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Namikoshi et al. (1987) studied this question.