Patent ID: 8119617

Claim:
A compound of formula wherein A is hydrogen or (C 1-4 )alkyl, R 1 is a group Y—R 2 , Y is not present or is (C 1-4 )alkylene, which alkylene is optionally substituted with halogen, R 2 is —P(O)(OH)(OH), X is a group of formula ring A is phenylene, and ring B is phenyl optionally substituted with R 5 , wherein R 5 is halogen, halo(C 1-4 )alkyl, halo(C 1-4 )alkyloxy, carboxyl, nitro, amino, a phosphor containing group, a sulfur containing group, or acyl or acyloxy comprising 1 to 12 carbon atoms beside the CO group, or R 5 is a group —ZR 6 , wherein Z is not present or is NH, O or S, and R 6 is hydrogen if Z is present, or R 6 is (C 3-12 )cycloalkyl, (C 5-12 )cycloalkenyl, (C 6-12 ) aryl, aromatic or aliphatic heterocyclyl, comprising 3 to 12 ring members and 1 to 4 heteroatoms selected from N, O or S, or (C 1-22 )alkyl, (C 2-22 )alkenyl, or (C 2-22 )alkynyl, which alkyl, alkenyl or alkynyl can be unsubstituted or substituted with (C 6-12 )aryl, or a prodrug of a compound of formula I which is a compound of formula I wherein R 2 is a phosphoric acid ester or phosphoric acid amide group, optionally in salt form, wherein the phosphoric acid ester or amide moiety is a group which is hydrolysable, or a prodrug of a compound of formula I which is a compound of formula I wherein the nitrogen of the amide group is substituted with a group which is hydrolysable.