∀ (A : Type u_4) [inst : CommRing A] [IsDomain A] (k : Type u_6) (K : Type u_7) [inst_2 : Field k] [inst_3 : Field K]
  [inst_4 : Algebra A k] [inst_5 : Algebra A K] [inst_6 : Algebra k K] [inst_7 : FaithfulSMul A k]
  [inst_8 : FaithfulSMul A K] [IsScalarTower A k K], IsScalarTower (FractionRing A) k K