∀ {C : Type u₁} [inst : CategoryTheory.Category.{v₁, u₁} C] {D : Type u₂} [inst_1 : CategoryTheory.Category.{v₂, u₂} D]
  {S : CategoryTheory.Functor Cᵒᵖ CommRingCat} {F : CategoryTheory.Functor C D}
  {R : CategoryTheory.Functor Dᵒᵖ CommRingCat}
  {M : PresheafOfModules (R.comp (CategoryTheory.forget₂ CommRingCat RingCat))} {φ : S ⟶ F.op.comp R}
  {d : M.Derivation φ} (self : d.Universal)
  {M' : PresheafOfModules (R.comp (CategoryTheory.forget₂ CommRingCat RingCat))} (φ_1 φ' : M ⟶ M'),
  d.postcomp φ_1 = d.postcomp φ' → φ_1 = φ'