Pluronic P-123
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Pluronic P-123 (BASF code) is a triblock copolymer, with a formula of HO(CH2CH2O)20(CH2CH(CH3)O)70(CH2CH2O)20H. It has around 5800 kDa weight and sold in Aldrich as Poly(ethylene glycol)-block-poly(propylene glycol)-block-poly(ethylene glycol).