MouseOverMolecule.cs

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using UnityEngine;
using System.Collections;

public class MouseOverMolecule : MonoBehaviour {
    
    public static bool stopCamera = false;
    private Camera mainCamera = null;
    
    // Use this for initialization
    

    // Does something as a response 
    // to the user clicking on the object 
    void OnMouseDrag () {
        if(Input.GetMouseButton(0)){
            if(mainCamera == null)
                mainCamera = Camera.main;
            maxCamera.cameraStop = true;
            stopCamera = true;
            Vector3 p = Input.mousePosition;
            p.z = mainCamera.WorldToScreenPoint(transform.position).z;
            transform.position = mainCamera.ScreenToWorldPoint(p);
        }   
    }
    
    void OnMouseUp() {
        Debug.Log("MouseUp is called now.");
        maxCamera.cameraStop = false;
        stopCamera = false;
    }
    
}