A new naphthalene derivative, hongconin, was isolated from the rhizome of Eleutherine americana MERR. et HEYNE (Iridaceae), together with three known naphthalene derivatives (1-3). The structure of hongconin was elucidated as 4 on the basis of chemical and spectral studies, and X-ray analysis.
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Zhengxiong et al. (1986) studied this question.