Sentence: The Alfa Romeo 164, or sometimes called the Alfa Romeo 168, is considered a mid-size luxury executive car. Its engine is also known as a straight-four engine.

What structured data could we extract from this sentence?
Alfa Romeo 164, engine, Straight-four engine; Alfa Romeo 164, alternativeName, "Alfa Romeo 168"; Alfa Romeo 164, class, "Mid-size luxury / Executive car"