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![Poly[(R)-3-hydroxybutyric acid-co-(R)-3-hydroxyvaleric acid] ~9:1](https://api.sigmaaldrich.com/deepweb/assets/sigmaaldrich/product/structures/531/188/fe91a61e-2782-46a3-91bb-0020ba37bdfa/640/fe91a61e-2782-46a3-91bb-0020ba37bdfa.png)