potassium 2-hydroxypropanoate POTASSIUM LACTATE 31981-04-1 996-31-6 Conclyte K EINECS 213-631-3 Lactic acid, monopotassium salt Lactic acid, potassium salt Monopotassium 2-hydroxypropanoate Monopotassium 2-hydroxypropanoate acid Monopotassium lactate Potassium DL-lactate Potassium alpha-hydroxypropionate Propanoic acid, 2-hydroxy-, monopotassium salt