摘要 |
Pharmaceutical compounds of the formula <CHEM> in which R<1> is hydrogen or halo, and R<2> is C1-10 alkyl, C2-10 alkenyl, C2-10 alkynyl, C3-6 cycloalkyl optionally substituted by 1 to 3 C1-4 alkyl groups, C3-6 cycloalkyl-C1-4 alkyl in which the cycloalkyl group is optionally substituted by 1 to 3 C1-4 alkyl groups, or optionally substituted phenyl-C1-4 alkyl; or a salt thereof. |