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OPhcall}'activeScrutinizingthestructuresofthesevenamidesoffivedifferenttypeSofskeletons,aplausiblebiogenicrelahonshiphasbeensuggestal[,'].Sincethetwoacyclicamides(6,7)wereisolatedwithfivecy'clicamides(l,2,3,4and5).itissuggestedthattheacyclicamideSarethePr......