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R1128 A, B, C and D, new non-steroidal estrogen-receptor antagonists, were isolated from the cultured broth of Streptomyces sp. No. 1128. Their structures were elucidated to be 1,3,6-trihydroxy-8-alkylanthraquinones on the basis of their physico-chemical properties and spectroscopic data.
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Hori et al. (1993) studied this question.
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