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Poly(propylene glycol) bis(2-aminopropyl ether), average Mn ~230
Poly(propylene glycol) bis(2-aminopropyl ether), average Mn ~2,000
Poly(propylene glycol) bis(2-aminopropyl ether), average Mn ~400
Poly(propylene glycol) bis(2-aminopropyl ether), average Mn ~4,000