Disclosed is a portable latent fingerprint developing apparatus capable of visibly checking out an external shape of a finger print by using an UV LED lamp, after a fine spray of a fingerprint developing liquid is conducted by using a vibrator and providing the corresponding fingerprint image to an external terminal, after it is photographed by a camera. Compounds of the formula I, 1in which the radicals have the stated meanings, and the physiological tolerated salts thereof and processes for preparing them are described. Then, the first mask is removed. The carrier and the protruding structure are removed from the sensor die.