There are provided compounds of the formula
or a pharmaceutically acceptable salt or ester thereof wherein X, Y, R1, R2 are as herein described.
The compounds have utility as antiproliferative agents, especially, as anticancer agents.
There are provided compounds of the formula
or a pharmaceutically acceptable salt or ester thereof wherein X, Y, R
1
, R
2
are as herein described.
The compounds have utility as antiproliferative agents, especially, as anticancer agents.