Patent ID: 6916816

Claim:
A compound of formula (I) wherein: L is Optionally substituted by replacement of up to 9 of the hydrogen atoms on the phenanthrene ring system by up to 9 independently selected substituent groups; A is CH 2 , SO 2 or C═O; X is CO 2 H, PO 2 H 2 , PO 2 H 2 , PO 2 HR 5 , PO 2 HOR 5 , SO 3 H, SO 2 H, or tetrazole; and R 1 , R 2 , R 3 , R 4 and R 5 are independently selected from H, alkyl, alkenyl, alkynyl, aryl and aralkyl; or a pharmaceutically acceptable acid salt or base addition salt or an in vivo hydrolysable ester or amide thereof.