Lycospidine A (1), the first example of a Lycopodium alkaloid which contains an unprecedented five-membered A ring, was isolated from Lycopodium complanatum. The unique five-membered A ring in 1 indicates that carbons 2-5 in 1 are presumably derived from proline instead of the lysine
Prolyl endopeptidase (PEP, EC 3.4.21.26) is an enzyme to play a role in metabolism of proline-containing neuropeptides, such as vasopressin, substance P and thyrotropin-releasing hormone (TRH), which were suggested to be involved with learning and memory processes. Then, specific inhibitor of PEP is
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