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The antibiotic roridin A (C29H40O9) yields on base catalysed hydrolysis verrucarol (10) and roridinic acid (13) (C14H22O7), a hitherto unknown dicarboxylic acid whose structure was proved by degradation. In roridin A 10 and 13 are united to form a macrocyclic diester to which structure 1 is assigned.
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Bohner et al. (1966) studied this question.
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