A compound of formula (I) or its enantiomers or diastereoisomers thereof:
wherein: A, X, W, R
1
, Y; R
3
; and R
4
are as defined herein.
The compounds of the invention may be used as inhibitors of the papilloma virus E1-E2-DNA complex. The invention further provides a method of treating or preventing human papilloma virus infection.