The present invention relates to novel substituted diamine derivatives for the formulawherein R1, R2, R3, R4, X1, X2, X3, X4, A, Y and n are as described in the specification, pharmaceutical compositions containing them and intermediates used in their manufacture. The probe includes a sensor housing for diverting a portion of the rapidly flowing fluid into a primary flow path. Specimen retrieval can occur at the computerized rack, individual storage units, or the main database server. The contact switching section has one end connected to the second electrode of the rechargeable battery, the other end is connected to allow switching between a contact connected to the second output terminal and a contact connected to the third output terminal. This allows increasing the rate of data transfer when the need justifies an increased card circuit complexity.