| abstract |
Compounds of formula (I), (II), (III) and (IV) and pharmaceutically acceptable salts thereof are disclosed. This compound is an inhibitor of ALK2 kinase. Also provided are pharmaceutical compositions comprising a compound of formula (I), (II), (III) or (IV) or a pharmaceutically acceptable salt thereof, as well as involving the use of the compound or a pharmaceutically acceptable salt and combination thereof Methods of biological treatment and prevention of various diseases and conditions such as fibrodysplasia ossificans progressiva. |