∀ {C : Type u_1} [inst : CategoryTheory.Category.{v, u_1} C] [inst_1 : CategoryTheory.MonoidalCategory C]
  [inst_2 : CategoryTheory.Limits.HasBinaryCoproducts C] [inst_3 : CategoryTheory.IsMonoidalRightDistrib C] {X Y Z : C},
  CategoryTheory.CategoryStruct.comp CategoryTheory.Limits.coprod.inl (∂R X Y Z).hom =
    CategoryTheory.MonoidalCategoryStruct.whiskerRight CategoryTheory.Limits.coprod.inl X