There are provided compounds of the formula
wherein X, Y, R
1
, R
2
, R
3
, R
3
, R
4
, R
5
, R
6
and R
7
are as described herein and enantiomers and pharmaceutically acceptable salts and esters thereof. The compounds are useful as anticancer agents.
There are provided compounds of the formula (I) wherein X, Y, R1, R2, R3, R3, R4, R5, R6 and R7 are as described herein and enantiomers and pharmaceutically acceptable salts and esters thereof. The compounds are useful as anticancer agents.
There are provided compounds of formula I
or a pharmaceutically acceptable salt thereof,
wherein X, Y, R
1
, R
1′
, R
2
, R
2′
, R
3
, R
4
, R
5
are as defined herein. The compounds exhibit activity as anticancer agents.