Patent ID: 8575353

Claim:
A compound of formula (Ib) wherein: R 1 is hydrogen, C 1-6 alkyl, —CH 2 OR 22 , —CH 2 OP(O)(OR 20 )(OR 21 ); R 2 is hydrogen, cyano, C 1-6 alkyl, C 3 -C 6 cycloalkyl, or halo; each of R 3 , R 4 , R 5 , R 6 , R 9 , R 10 , R 11 , R 12 and R 13 is independently hydrogen, halo, C 1 -C 6 alkyl, hydroxyl, or —CH 2 OR 22 ; R 7 is hydrogen or C 1-6 alkyl; each of R 20 and R 21 is independently Na + , Li + , K + , hydrogen, or C 1-6 alkyl; each R 22 is independently hydrogen, C 1 -C 6 alkyl, C 3 -C 6 cycloalkyl, phenyl or benzyl; or a pharmaceutically acceptable salt, single stereoisomer, mixture of stereoisomers, or tautomer thereof.