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r - ( ) - 2 - (4 - hydroxyl phenoxy) propionic acid (hppa) r - ( ) - 2 - (4 - hydroxyl phenoxy) propionic acid (hppa)
polyurethane material polyurethane composite material

r - ( ) - 2 - (4 - hydroxyl phenoxy) propionic acid (hppa) r - ( ) - 2 - (4 - hydroxyl phenoxy) propionic acid (hppa)
polyurethane material polyurethane composite material

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