Checked my can of "Chipotle Peppers in Adobo Sauce" (Mexican Brand) for you....
Ingredients beside the Peppers are...
Tomato Puree
Water
Vegetable Oil
Flour
Salt
Vinegar
Onion Powder
Garlic Powder
and Spices
but sorry, no Soya Sauce. Seems to be different from the Phillipin Version of Adobo....