Platycogenic acids A, B, and C are 2β,3β,16α,23-tetrahydroxyolean-12-ene-24,28-dioic acid, and 2β,3β,-16β,21β-tetrahydroxyolean-12-ene-24,28-dioic acid and -28-oic acid, respectively.
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Kubota et al. (1969) studied this question.