Four new sesquiterpenoids, furanocaulesone-A (I), (+)-aoifuranone (II), furanocaulesone-B (III), and furanocaulesone-C (IV), were isolated from the essential oil of the subterranean part of A sarum caulescens (Aristolochiaceae). Structures of these substances were determined from chemical and spectroscopic evidences.
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Jiro Endo (1975) studied this question.