| abstract |
PROBLEM TO BE SOLVED: To provide a compound for treating spinal muscular atrophy, a composition obtained from the compound, and use thereof. A compound represented by the diagram (Ia1). (Where Rn is a specific group) R1 is a heterocyclyl selected from substituted / unsubstituted oxiranyl, pyrrolinyl, etc .; R2 is a substituted / unsubstituted aryl or heteroaryl; each Ra is independently H, halogen or substituted / unsubstituted Substituted alkyl; Rb is substituted / unsubstituted H, halogen, alkyl or alkoxy |