| 摘要 |
<p>The present invention relates to compounds of formula (I) which exhibit excellent immune suppression activity, pharmacologically acceptable salts thereof, esters thereof or other derivatives: <CHEM> wherein R<1> and R<2> are a hydrogen atom, an amino protecting group; R<3> is a hydrogen atom, a hydroxy protecting group; R<4> is a lower alkyl group; n is an integer from 1 to 6; X is an ethylene group; Y is a C1-C10 alkylene group, a C1-C10 alkylene group substituted with 1 to 3 substituents selected from substituent group a and b; R<5> is an aryl group; R<6> and R<7> are a hydrogen atom, a group selected from substituent group a; with the proviso when R<5> is a hydrogen atom, Y is not a single bond or a straight chain C1-C10 alkylene group.</p> |
