How to declare a typedef for a parameter in the dependent scope of a nested template

Question

I want to declare a typedef for a parameter in a dependent scope of a nested template in C++. I tried below.

template<typename T1, template<typename, typename...> typename T2, typename T3>
struct Test {
  using valueT = std::vector<T2>::value_type;
};

But my program gives a compile error template argument 1 is invalid at typedef line