Three minor new anthraquinones were isolated from the bulb of Eleutherine americana Merr. et Heyne. Their structures were elucidated as methyl ethers of 3, 4, 8-trihydroxy-1-methyl-anthra-9, 10-quinone-2-carboxylic acid methyl ester 4-6 by spectral analyses including long-range selective proton decoupling (LSPD) experiments in 13C-NMR.
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Komura et al. (1983) studied this question.