There are provided compounds of the formula
wherein X, Y and R
1
to R
8
are described herein along with the enantiomers, pharmaceutically acceptable salts and esters thereof. The compounds are useful as anticancer agents.
There are provided compounds of the formula
wherein X, Y and R1 to R8 are described herein along with the enantiomers, pharmaceutically acceptable salts and esters thereof. The compounds are useful as anticancer agents.
There are provided compounds of the formula
wherein X, Y, R
1
, R
1′
, R
2
, R
2′
, R
3
, R
4
, R
5
and R
6
are as described herein and enantiomers or a pharmaceutically acceptable salt or ester thereof. The compounds are useful as anticancer agents.