| abstract |
A compound represented by the formula: ** (See formula) ** where X is CH or N, one of Y and Z is C (O) and the other is C (R2) (R3), R2 and R3 are both hydrogen atoms; the atom in R1 attached to N of Y-N-Z is C; and R1 is an optionally substituted C6-14 aryl group, an optionally substituted C3-10 cycloalkyl group that is optionally fused with an optionally substituted benzene ring or an optionally substituted non-aromatic heterocyclic group, or a salt thereof. |