Melanin A, a new pentacyclic triterpene of ursane series isolated from the aerial parts of Echinops Gemini, is elucidated structurally as 1 on the basis of 1D and 2D NMR spectroscopic studies.
文摘Melanin A, a new pentacyclic triterpene of ursane series isolated from the aerial parts of Echinops Gemini, is elucidated structurally as 1 on the basis of 1D and 2D NMR spectroscopic studies.