Compounds of formula (I) : formula (I) and salts, solvates, chemically protected forms, and prodrugs thereof, are disclosed wherein R2 is selected from: an optionally substituted napthyl group; an optionally substituted thiophenyl or furanyl group; and a phenyl group substituted by: one or more chloro or fluoro groups; an ethyl or propyl group; a 4-t-butyl group; a 2-methyl group; or two methyl groups in the 2- and 6- positions.
                            公式(I)的化合物:公开了公式(I)及其盐、溶剂合物、
化学保护形式和前药,其中R2选自:可选择的取代
萘基团;可选择的取代
噻吩基团或
呋喃基团;以及被取代的苯基,其被
氯或
氟基、乙基或丙基、4-叔丁基、2-甲基或2-位和6-位的两个甲基基团取代。