Patent ID: 8524740

Claim:
A compound of Formula I: or a pharmaceutically acceptable salt thereof, (i) wherein: R is hydrogen, PO(OH) 2 , P(═O)(O—(C 1 -C 18 )alkylenephenyl)) 2 , P(═O)(OH)(OM), or P(═O)(OM) 2 ; W is 2-halophenyl, 3-halophenyl, -halophenyl; R 5 is (C 1 -C 18 )alkoxy, hydrogen, hydroxyl, OR 8 ; R 6 is hydroxyl, or (C 1 -C 18 )alkoxy; R 7 is hydrogen, hydroxyl, or O—(C 1 -C 18 )alkylenephenyl; R 8 is hydrogen, PO(OH) 2 , P(═O)(O—(C 1 -C 18 )alkylenephenyl) 2 , P(═O)(OH)(OM), or P(═O)(OM) 2 , and M is a monovalent or divalent metal ion, or alkylammonium ion; (ii) or wherein; R is hydrogen, PO(OH) 2 , P(═O)(O—(C 1 -C 18 )alkylenephenyl) 2 , P(═O)(OH)(OM), or P(═O)(OM) 2 ; W is 2-halophenyl, 3-halophenyl, 4-halophenyl; R 5 is hydrogen, (C 1 -C 18 )alkoxy, hydroxyl, or OR 8 ; R 6 is hydroxyl or (C 1 -C 18 )alkoxy; R 7 hydroxyl, or O—(C 1 -C 18 )alkylenephenyl; R 8 hydrogen, PO(OH) 2 , P(═O)(O—(C 1 -C 18 )alkylenephenyl) 2 , P(═O)(OH)(OM), or P(═O)(OM) 2 ; and M is a monovalent or divalent metal ion, or alkylammonium ion.