∀ (R : Type u_2) {S : Type u_3} (T : Type u_1) [inst : CommRing R] [inst_1 : CommRing S] [inst_2 : CommRing T]
  [inst_3 : Algebra R S] [inst_4 : Algebra R T] [inst_5 : Algebra S T] [inst_6 : IsScalarTower R S T] (M : Submonoid S)
  [IsLocalization M T] (y : (Algebra.Generators.self R S).toExtension.Ring)
  (hy : y ∈ Submonoid.comap (algebraMap (Algebra.Generators.self R S).toExtension.Ring S) M),
  IsUnit
    (((IsScalarTower.toAlgHom R S T).comp (IsScalarTower.toAlgHom R (Algebra.Generators.self R S).toExtension.Ring S))
      ↑⟨y, hy⟩)