Abstract (15R)-11,16-Dihydroxy-12-methoxymethoxy-8,11,13-abietatrien-7-one and its (15S)-epimer prepared from a C-15 epimeric mixture of 12-methoxy-8,11,13-abietatrien-16-ol, were transformed into (15R)-6,11,12,14,16-pentahydroxy-5,8,11,13-abietatetraen-7-one and its (15S)-epimer; these were identical with natural (15R)-coleon C and (15S)-coleon C, respectively.
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Matsumoto et al. (1987) studied this question.
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