A semiconductor package includes a first package including a first wiring board and at least one first semiconductor chip mounted on the first wiring board, a second package stacked on the first package. The method was developed by attempting to simulate without freezing, the events that take place during freezing living cells andor tissue. The method further includes identifying a return signal by at least partially removing from the output signal at least one of: the communicated signal and base line wander. The decoding means decodes data that have been encrypted by the encryption means with unique information that corresponds to the encryption key as the decoding key. It further relates to compounds so obtained and to compounds resulting from the ring closure of compound.