Guido Raos’s favorite structure is:

isotactic polypropylene

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Source: Nuovo Cimento, 1960

Why?

This structure — solved by Paolo Corradini, working in Giulio Natta's laboratory in the 1950's — provided a compelling proof of the possibility of "breaking Nature's monopoly" in the synthesis of stereoregular polymers. The polymer chains adopt a helical conformation, in a striking analogy with DNA and alpha-helical proteins (whose structures had been worked out shortly before by Watson&Crick and by Pauling&Corey).—Guido Raos

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