Four triterpenes, three lupanes, and a germanicane were isolated from Machaerocereus eruca . The germanicane derivative ( 1 ) was determined to be 3β,19α-dihydroxygermanican-28-oic acid and named machaeroceric acid. The three new lupane derivatives were identified as 21-ketobetulinic acid ( 2 ), 16β-hydroxybetulinic acid ( 3 ), and 22β-hydroxystellatogenin ( 4 ), respectively, on the basis of their spectroscopic data.
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Ye et al. (1998) studied this question.
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