I have some of the La Costeña brand Chipotles en Adobo myself. The ingredients listed on the can are: Chipotle peppers, vinegar, tomatoes, onions, sugar, iodized salt, paprika, soybean oil, and spices. No mention of High-fructose corn syrup at all.
The sauce isn't really that sweet, and is incredibly smokey in taste. It's also on the spicy side, from the peppers. Whenever I use the canned stuff, I just purree the entire can and use it as needed.
Peace, Love, and Vegetable Rights!
Eat Meat and Save the Plants!