Disclosed herein are a novel crystal of a novel triterpene derivative, a method for producing the crystals, and a pharmaceutical preparation obtained by using the crystals. The apparatus includes a policy repository, a scheduler, a triggering module, a pre-computation module. Further, simpler fabrication, higher yield rate, and lower cost are also achieved. When implementing such functionality in hardware within a communication device that is operable to decode LDPC coded signals, this reduction in processing complexity greatly eases the actual hardware’s complexity as well.