| 摘要 |
Compounds of formula (I): <IMAGE> (wherein R<1> represents a hydrogen atom or a methyl group; R<2> represents a hydrogen atom, the alcoholic moiety of an ester or the cationic moiety of a salt; R<3>, R<4> and R<5> are the same or different and each represents a hydrogen atom or an organic or inorganic acyl group, provided that, when R<3> represents a 2-methylbutyryl group, R<4> and R<5> both represent acyl groups; and n is the valency of R<2>) may be prepared by cultivating microorganisms of the genera Penicillium or Monascus or by salifying or esterifying the corresponding carboxylic acid or lactone or, in the case of esters of the above formula (I), by esterifying a corresponding salt of the above formula (I). |
