How do you check to see if an animation is playing in a Sub-State machine?

I'm trying to get specific directional animations playing for a 2D sprite. For example, if the sprite is in the right-up diagonal animation, I'd like to play the right-up diagonal attack animation.

How do I check to see if the right-up animation is playing? It's buried in a sub-state machine. I tried this:

 if(this.anim.GetCurrentAnimatorStateInfo(0).IsName("Idle_UpRight")){
 
             if(Input.GetMouseButtonDown(0)){
                 Debug.Log("Attack right");
             }
 
         }

But no luck