This invention provides a therapeutic agent capable of specifically forming a complex with human immunodeficiency virus envelope glycoprotein which comprises a polypeptide. This wavelength conversion device includes at least one of a nonlinear crystal for generating SFG light and a nonlinear crystal for generating SHG light. The apparatus may include slips having cavities to facilitate quick drill-out of the plug. Rear caster wheels are fixed to the rear link arms. When the color flag is OFF, the print data prepared and developed in the page buffer is sent to a monochromatic printer. The polyglycerol monoether may be prepared by adding a basic substance to an alcohol to yield an alkoxide, adding glycidol to the alkoxide, and subjecting them to a reaction at 0\xb0 C.