abstract |
The present invention relates to (formulas Ia-Ib) wherein A, X, R a , R 1 , R 2 , R 4 , R 5 and R 16 are defined herein as stereoisomers thereof or Pharmaceutical compositions comprising a TYK2 inhibitor of a pharmaceutically acceptable salt thereof, a compound of formula (Ia-Ib) and a pharmaceutically acceptable carrier, adjuvant or vehicle, and the compound or in the treatment of inflammatory diseases Methods of using the compositions are provided. |