Olodaterol hydrochloride869477-96-3100 % similar Olodaterol868049-49-495 % similar Midodrine hydrochloride3092-17-934 % similar 8-[(2R)-2-Oxiranyl]-6-(phenylmethoxy)-2H-1,4-benzoxazin-3(4H)-one869478-12-633 % similar