Abstract magnified image Two new triterpenes, poricoic acid AE ( 1 ) and poricoic acid CE ( 2 ), were isolated from the surface layer of the mushroom Poria cocos ( Schw .) Wolf , together with four known triterpenes, 3‐ O ‐acetyldehydroeburicoic acid, 3‐oxolanosta‐7,9(11),24(31)‐trien‐21‐oic acid, dehydrotrametenolic acid, and poricoic acid A. The structures of the two new triterpenes were elucidated as 16 α ‐hydroxy‐3,4‐seco‐lanosta‐4(28),7,9(11),24(31)‐tetraene‐3,21‐dioic acid‐3‐ethyl ester ( 1 ) and 3,4‐secolanosta‐4(28),7,9(11),24(31)‐tetraene‐3,21‐dioic acid‐3‐ethyl ester ( 2 ) mainly on the basis of HR‐ESI‐MS, EI‐MS, and 2D‐NMR analyses.
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Yang et al. (2009) studied this question.
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