How to use onmousedown unity

using UnityEngine.EventSystems;

public class ClickDetector : MonoBehaviour, IPointerDownHandler, IPointerClickHandler,
    IPointerUpHandler, IPointerExitHandler, IPointerEnterHandler,
    IBeginDragHandler, IDragHandler, IEndDragHandler
{
    public void OnBeginDrag(PointerEventData eventData)
    {
        Debug.Log("Drag Begin");
    }

    public void OnDrag(PointerEventData eventData)
    {
        Debug.Log("Dragging");
    }

    public void OnEndDrag(PointerEventData eventData)
    {
        Debug.Log("Drag Ended");
    }

    public void OnPointerClick(PointerEventData eventData)
    {
        Debug.Log("Clicked: " + eventData.pointerCurrentRaycast.gameObject.name);
    }

    public void OnPointerDown(PointerEventData eventData)
    {
        Debug.Log("Mouse Down: " + eventData.pointerCurrentRaycast.gameObject.name);
    }

    public void OnPointerEnter(PointerEventData eventData)
    {
        Debug.Log("Mouse Enter");
    }

    public void OnPointerExit(PointerEventData eventData)
    {
        Debug.Log("Mouse Exit");
    }

    public void OnPointerUp(PointerEventData eventData)
    {
        Debug.Log("Mouse Up");
    }
}

//be sure to use the unity system. above

void OnMouseDown()
    {
        Destroy(gameObject);
    }

public class Combat_spell : MonoBehaviour, IPointerClickHandler,
 IPointerExitHandler, IPointerEnterHandler
{
    public void OnPointerClick(PointerEventData eventData)
    {
        UseSpell();
    }

    public void OnPointerEnter(PointerEventData eventData)
    {
        Scene_Main.display_Description("Frappe", "Inflige 5 à 7 dégats", 3, -2, this.transform.position, 3);
    }

    public void OnPointerExit(PointerEventData eventData)
    {
        Scene_Main.display_Description_Erase();
    }
}

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