According to MSGmyth.com, the following is a list of other names for MSG.
As for sensitivity to MSG, we are all sensitive to MSG whether we know it or not. It kills brain cells. It's an excitotoxin and has no business in food any more than Roundup does.
Foods always contain MSG when these words are on the label:
MSG, Gelatin, Calcium Caseinate, Monosodium glutamate, Hydrolyzed Vegetable Protein, Textured Protein, Monopotassium glutamate, Hydrolyzed Plant Protein, Yeast Extract, Glutamate, Autolyzed Plant Protein, Yeast food or nutrient, Glutamic Acid, Sodium Caseinate, or Autolyzed Yeast
Foods made with the following products often contain MSG.
Malted Barley (flavor) Flavors, Flavoring, Modified food starch, Barley malt Reaction Flavors, Rice syrup or brown rice syrup, Malt Extract or Flavoring, Natural Chicken, Beef, or Pork, Flavoring, "Seasonings" (Most assume this means salt, pepper, or spices and herbs, which sometimes it is.), Lipolyzed butter fat, Maltodextrin, Soy Sauce or Extract, "Low" or "No Fat" items, Caramel Flavoring (coloring), Soy Protein, Corn syrup and corn syrup solids (some companies use another process to make their product, saying it is MSG free), Stock, Soy Protein Isolate or Concentrate, Citric Acid (when processed from corn), Broth, Cornstarch, Milk Powder, Bouillon, Flowing Agents, Dry Milk Solids, Carrageenan, Wheat, rice, or oat protein, Protein Fortified Milk, Whey Protein or Whey, Anything enriched or vitamin enriched, Annatto, Whey Protein Isolate or Concentrate, Protein fortified "anything", Spice, Pectin, Enzyme modified "anythng", Gums, Protease, Ultra-pasteurized "anything", Dough Conditioners, Protease enzymes, Fermented "anything", Yeast Nutrients.
So, I'd bet that commercially prepared sauce had some of the above.