| abstract |
A compound represented by the following general formula (I): n n n wherein X represents R 1 (R 2 )R 3 )C- where R 1 represents a C 3 -C 8 cycloalkyl group, an optionally substituted C 6 -C 14 aryl group, an optionally substituted heterocyclic residue, an optionally substituted C 6 -C 14 aryloxy group, or an optionally substituted C 7 -C 15 arylmethyl group; R 2 and R 3 independently represent hydrogen atom or a C 1 -C 5 alkyl group, or R 2 and R 3 may combine to represent a C 2 -C 7 alkylene group; or n X represents R 7 -A- wherein R 7 represents (i) a C1-C10 alkyl group which may optionally be substituted with an optionally substituted C6-C14 aryl group, an optionally substituted fluorenyl group or an optionally substituted heterocyclic group, (ii) an optionally substituted C6-C14 aryl group or (iii) an optionally substituted heterocyclic group, and A represents an oxygen atom or -N-R 8 where R 8 represents hydrogen atom or a C1-C5 alkyl group. n Y represents an oxygen atom or a sulfur atom, n R 4 and R 5 independently represent hydrogen atom or a C 1 -C 5 alkyl group; and R 6 represents hydrogen atom, a C 1 -C 5 alkyl group which may optionally be substituted with a hydroxyl group, a hydroxyl group or a C 1 -C 5 alkoxy group, n provided that the compounds wherein R 7 is a benzyl group, A and Y are an oxygen atom, R 4 and R 5 are hydrogen atom, and R 6 is a propyl group are excluded, or a salt thereof, or a solvate thereof or a hydrate thereof. |