Compounds and compositions for inducing chondrogenesis

A compound of Formula IB1:

• or a pharmaceutically acceptable salt, or a stereoisomer thereof, wherein
• R1 is a 5 or 6 membered heteroaryl, unsubstituted or substituted by 1 to 2 substituents independently selected from halo, C1-4alkyl, C1-4haloalkyl, and NHR14b, wherein R14b is hydrogen or C1-4alkyl;
• and
• R3 is phenyl substituted by 1 to 2 substituents independently selected from halo, cyano, C1-6alkyl, C1-6haloalkyl, C1-6alkoxy, C1-6haloalkoxy, and phenyl, —C(O)R16, —C(O)OR16, wherein R16 is C1-6alkyl, and the phenyl substituent of R3 is unsubstituted or further substituted by 1 to 2 substituents independently selected from halo and cyano.