A polymorphic form of 9-nitrocamptothecin is provided, the polymorph being characterizable as having, by differential scanning calorimetry, no observable endotherm and an exotherm at between 273. In this case, the internal circuit and power supply control unit are provided in one semiconductor integrated circuit device so that reduced power consumption and power supply switching in accordance with the operation mode can be achieved. The target agents attach the device and are removed from the sample.