Poly(oxy-1,2-ethanediyl),a-(3-carboxy-1-oxo-2-propenyl)-w-hydroxy-, (Z)-, C16-18-alkylethers; Poly(oxy-1,2-ethanediyl), a-[(2Z)-3-carboxy-1-oxo-2-propenyl]-w-hydroxy-, C16-18-alkyl ethers
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