∀ {C : Type u_2} [inst : CategoryTheory.Category.{u_1, u_2} C] [inst_1 : CategoryTheory.CartesianMonoidalCategory C]
  [inst_2 : CategoryTheory.BraidedCategory C] (M N : CategoryTheory.Mon C),
  { hom := CategoryTheory.SemiCartesianMonoidalCategory.fst M.X N.X, isMonHom_hom := ⋯ } =
    CategoryTheory.CategoryStruct.comp
      (CategoryTheory.MonoidalCategoryStruct.whiskerLeft M
        ((CategoryTheory.Limits.IsTerminal.ofUniqueHom
              (fun M => { hom := CategoryTheory.SemiCartesianMonoidalCategory.toUnit M.X, isMonHom_hom := ⋯ }) ⋯).from
          N))
      (CategoryTheory.MonoidalCategoryStruct.rightUnitor M).hom