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    • Muñoz Muñoz, Orlando; Ruiz, Roberto; Gonzáles, Antonio; Nüñez, Mercedes P.; Jiménez, Ignacio; Ravelo, Angel (1993)
      The known triterpenoids β‐amyrin (= olean‐12‐en‐3β‐ol; 22), lupeol (= lup‐20(29)‐en‐3β‐ol; 17), betulin (= lup‐20(29)‐ene‐3β,28‐diol; 18), lup‐20(29)‐ene‐3β,30‐diol (20), oleanolic acid (= 3β‐hydroxyolean‐12‐en‐28‐oic acid; ...