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seen framstella a foam by a hydroxy - or aminsubstituerad aromatic forening, elementert sulphur, a carboxylic acid and an isocyanate - or isotiocyanatforening
seen framstella a foam by a hydroxy - or aminsubstituerad aromatic forening, elementert sulphur, a carboxylic acid and an isocyanate - or isotiocyanatforening