![](http://www.alamy.com/thumbs/6/868E86B1-D6AE-4751-B376-D6D9D8506B77/2BCW99K.jpg)
Lactic acid (L-lactic acid) milk sugar molecule. Building block of polylactic acid (PLA) bioplastic. Found in milk. Skeletal formula.
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Photo credit: © molekuul.be / Alamy / Afripics
License: Royalty Free
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