Gerty Cori Biochemist on USA Stamp

Biochemist Gerty Cori is going to be on a new USA stamp to be issued in March. Cori and her husband won the Nobel Prize in 1947 for their work on glycogen metabolism [Nobel Laureates: Carl Ferdinand Cori and Gerty Theresa Cori].

One of the key intermediates in this pathway is the Cori ester [Monday's Molecule #25]. That's the molecule pictured on the stamp. Unfortunately, there's a mistake in the structure. How many can spot it? Why didn't they ask a biochemist to check the design?

UPDATE: Here's the correct structure.

The error was first discovered by a reader of Chemical & Engineering News [Going postal over structural errors]. Here's how C&EN describes the mistake ...

It is a sad state of affairs, because it was precisely the isolation of glucose-1-phosphate, and discovery of the so-called Cori ester, that garnered Cori the Nobel Prize. "Long-dead carbohydrate chemists would roll over in their graves to see this structure after all the effort they made to get it right," one sugar chemist wrote in an e-mail to Newscripts.

The glitch made us rather glum, despondent even, as we considered the squandered opportunity to serve some first-class carbohydrates to the American public. For alas, the suboptimal stamps have already been printed and are still scheduled for release in early March, despite the error.

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[Hat Tip: Living the Scientific Life]