| abstract |
A compound of formula (I) wherein one of R1 and R2 is -Si(R)3, and the other is hydrogen or -Si(R)3; or R1 is a bond, R2 is -Si(R)2- or -Si(R)2 -O-Si(R)2-, and R10-CH2-CH-CH-OR2 taken together form a ring; R3 and R4 are the same or different and are each halogen; and each R is the same or different and is alkyl, aryl, cycloalkyl or heterocycloalkyl; or a pharmaceutically acceptable salt thereof. |