申请人:Selwood David
公开号:US20120077863A1
公开(公告)日:2012-03-29
A compound of formula I, or a pharmaceutically acceptable salt thereof, wherein —X
1
, X
2
and X
3
are each independently where Y is an alkylene, alkenylene or alkynylene group, each of which may be optionally substituted with one or more substituents selected from alkyl, halo, CF
3
, OH, alkoxy, NH
2
, CN, NO
2
and COOH; W is absent or is O, S or NH; R
1
, R
2
, R
3
and R
4
are each independently selected from H, alkyl, aryl and a protecting group Pi; R
7
, R
8
and R
9
are each independently selected from H, alkyl, halo, CF
3
, OH, alkoxy, CN, NO
2
and COOH; —q is 1, 2, 3 or 4; q′ is 0, 1, 2 or 3, where q+q′ equals 4; p and r are each independently 1, 2, 3, 4 or 5; p′ and r′ are each independently 0, 1, 2, 3 or 4, where p+p′ and r+r′ each equal 5; and —n is 0, 1, 2, 3, 4, 5 or 6.