Patent ID: 7041701

Claim:
A compound of the formula Ia, or a pharmaceutically acceptable salt thereof; wherein: X 1 is C═O, or CHOR 1a ; X 3 is C═O, CHOR 1b , or CHOCOR 1b ; R 1 and R 3 are each independently H or lower alkyl; R 2 , R 4 and R 5 are each independently lower alkyl; R 6 is H or absent if “a” is a double bond; R 7 is H, COOR 1c , YOCOR 1c , COOYOCOR 1e , YCOOR 1e ; R 8 is H, COOR 1d , YCOOR 1d , YCOOR 10 , YCOH al , COOYOCOR 1d , CH 2 OR 1d , CH 2 COCOR 1d , COCOCOR 1d , or R 7 and R 8 together are ═CH 2 ; R 10 is lower alkyl substituted Hal; “a” is a double bond or single bond; and wherein Y═(CH 2 ) n n=0 to 5; R 1a-1e are the same or different groups of R 1 with the proviso that when X 1 is CHOH, X 3 is C═O, “a” is a single bond, R 1-5 are Me, and R 6 is H, when R 7 is H, R 8 is other than H, CH 2 COOH or CH 2 COOMe; when R 7 is CH 2 OAc, R 8 is other than CH 2 COOH; or a pharmaceutically acceptable salt thereof.