153881-25-5 2H-1,4-Benzothiazine-3-carboxylic acid, 3,4-dihydro-7-(2-aminoethyl)-5-hydroxy-, (R)- 3,4-Dihydro-7-(2-aminoethyl)-5-hydroxy-2H-1,4-benzothiazine-3-carboxylic acid (R)- 7-(2-Aminoethyl)-3,4-dihydro-5-hydroxy-2h-1,4-benzothiazine-3-carboxylic acid