Three new cyclic octapeptides, microtoenins A−C (1−3), and a new glycoside, 3‘ ‘‘-O-methylcrenatoside (4), along with several known compounds, were isolated from the ethanolic extract of the stems of Microtoena prainiana. Their structures were determined by spectral and chemical evidence. At a concentration of 0.01 mg/mL, 3‘ ‘‘-O-methylcrenatoside (4), crenatoside (5), and isocrenatoside (6) inhibited angiotensin converting enzyme (ACE) activity by more than 30%.
Three new cyclic octapeptides, microtoenins A−C (1−3), and a new glycoside, 3‘ ‘‘-O-methylcrenatoside (4), along with several known compounds, were isolated from the ethanolic extract of the stems of Microtoena prainiana. Their structures were determined by spectral and chemical evidence. At a concentration of 0.01 mg/mL, 3‘ ‘‘-O-methylcrenatoside (4), crenatoside (5), and isocrenatoside (6) inhibited angiotensin converting enzyme (ACE) activity by more than 30%.
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