Assertion: alkaloid's structure | /r/CapableOf | become possible
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Source sentences:
text: The ketonic structure (14), which would resist oxidation to a tricarboxylic acid, thus became possible for papaverinic acid leading to the structure (15) for papaverine, which satisfactorily accounts for all the oxidation products of papaverine, namely papaverinic acid, veratric acid and the acids (6) and (7).