Use specialized template user option

I specialize a template by enum

template<>
class specialized_class<user_option=CHOICE_ENUM::CHOSEN_OPTION>
{

public:

    typedef second_class<user_option> obj_type;

Here, to define second_class, I need to know, what type user has selected. I need to name the chosen option. However the second line of my code is an illegal syntax. How to do what I need?