Well, I was hoping for a few more comments but spasm3 and Trajan pretty much nailed it early on.
This versatile biological polymer has many uses and application as our respondents have indicated.
First used under the pharmacological trade name of Periston, with a formula of C6H9NO, it was first used as a blood plasma substitute.
Other forms of this vinyl polymer are used as coatings on pharmaceutical pills.
For those interested in more pharmacological uses, see the pharmacology section in this link: polyvinylpyrrolidone pharmacology
In this case I think it is only fair to award the much sought after and rare Piston Cup Lapel Pin
to both respondents.
It wouldn't be the Holidays if it weren't for the Turkeys, the Fruitcakes, the hams, and the mixed nuts. But enough about my relatives.