Question how do i get my script working

Assets\pistol\color\Gun.cs(13,43): error CS1003: Syntax error, ',' expected
this is the error i recieved for my script i got from a video heres the scrip

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Gun : MonoBehaviour
{
public Transform bulletSpawnPoint;
public GameObject bulletPrefab;
public float bulletSpeed = 10;

void Update()
{
if (Input.GetKeyDown(KeyCode.Left Mouse Key))
{
var bullet = Instantiate(bulletPrefab, bulletSpawnPoint.position, bulletSpawnPoint.rotation);
bullet.GetComponent<Rigidbody>().velocity = bulletSpawnPoint.forward * bulletSpeed;
}
}
}



i have underlines where it says the problem is please help

 

First, please use code tags when posting code examples, as I do below. Makes it much easier for people to help.

From the Unity Docs, here is how to sense the left mouse click.

Code (CSharp):

1. public class Example : MonoBehaviour
2. {
3.     void Update()
4.     {
5.         //Detect if the left mouse button is pressed
6.         if (Input.GetKey(KeyCode.Mouse0))
7.         {
8.             Debug.Log("Mouse 0 ");
9.         }
10.     }
11. }