For every Chinese buyer who trusts a familiar brand or sales agent, many more will figure that a native developer has a better product.

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If the scan is negative, indicating no clumps or few clumps of amyloid, "that gives the clinician a clue that Alzheimer's is less likely to be the cause of those symptoms, " said Daniel Skovronsky, who developed the agent and is the global brand-development leader for Amyvid at Lilly.

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Down the street a pristine, nearly empty branch of Mexican banking giant Bancomer, devoted to money transfers, sits a few storefronts down from a cluttered travel agent offering transfers under the Orlandi Valuta brand--a subsidiary of Western Union's parent.

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