| abstract |
A compound of formula (I) or formula (II) wherein A is alkylene, alkenylene, alkynylene, hydroxyalkylene, arylene, -C(O)N(R4)-, -N(R4)C(O)-, -C(O)- or -C(=NOR4)-; B is alkylene, alkenylene, alkynylene, arylene or heteroarylene; X is oxygen, -C(O)-, -S(O),-, -N(R4)-, -C(R6)2- or -Si(R5)2-; Y is -CH2-; or X is C(R6), Y is CH and X and Y taken together form -C(R6)=CH-; each R1 is the same or different and is alkyl; each R2 is the same or different and is halogen, hydroxy, alkyl or alkoxy; each R3 is the same or different and is hydrogen, alkyl or aryl; each R4 is the same or different and is hydrogen or alkyl; each R5 is the same or different and is alkyl; each R6 is the same or different and is hydrogen, alkyl or aryl; bis 0 or 1; I is O, 1 or 2; M is O, 1, or 3; and N is O, 1 or 2; or a pharmaceutically acceptable salt thereof. |