Where is joomla Virtuemart $addtocart variable defined

Where is joomla Virtuemart $addtocart variable defined?
This variable shows add to cart button. I need to add some class on this button.SoI need to know where this variable is defined?

Solution

You can access the add to cart in components\com_virtuemart\themes\default\templates\product_details\includes\addtocart_form.tpl.php

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