| abstract |
A compound having the formula (11 [a): ** Formula ** or a therapeutically acceptable salt thereof wherein A1 is C (A2); A2 is H; B1 is OR1, or 10 NHR1, wherein R1 is C1-C10 alkyl substituted with R10; D1 is H: E1 is H: Y1 is NO2; G1 is alkyl substituted with OP (O) (OH) (OH); R10 is C3-C10 cycloalkyl having one or two CH2 radicals not replaced or replaced by O; wherein the radical represented by R10 is not substituted or is substituted by one or two or three or four or five substituents independently selected from the group consisting of R50, O50, F, Cl, Br and I; and R50 is C1-C10 alkyl. |