Two new isopimarane-type diterpenes named orthosiphonones A and B and a new benzochromene named orthochromene A, have been isolated from the water decoction of the leaves of Orthosiphon aristatus (Lamiaceae) collected in Java, Indonesia. Their chemical structures have been elucidated on the basis of physicochemical and chemical evidence.
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Shibuya et al. (1999) studied this question.
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