Structure of naematolin C and naematolin G, novel 4,8,11,11-tetramethyltricyclo[5.4.0.02,3]undecane sesquiterpenoids
Abstract
Naematolins C and G, metabolites of Naematoloma fasciculare, have the novel (1S,2S,3S,4R,5S,6R,8R,9S)-6-acetoxy-2,3,5-trihydroxy-4,8,11,11-tetramethyltricyclo[5.4.0.02,3]undecan-7-one (4) structure and its 6-epimer (7), respectively, as shown by a crystal structure determination of the chloroacetate (5).