-2–1,2,3,4-tetrahydro-6-methoxy-5–3-isoquinoline carboxylic acid in substantially pure form is described together with its sodium salt and solvates. The hydrogen generator includes container, and a first reactant storage area configured to contain a liquid first reactant. The MDD and hybrid detector can be used in mass spectrometry, in particular, time-of-flight mass spectrometry. The player operates the handle grips to carry out the up and down movement on the belly in one way and rotates the push-pull rod around the belly in other way to accomplish the weight reduction and fat removal in the belly. The system then looks up an agent address of one of the IRAs that is associated with the service identifier selected by the user from the menu and establishes a session with the associated IRA.