AMORPHIZING AGENT, AMORPHOUS COMPOSITION COMPRISING AMORPHIZING AGENT AND UTILIZATION THEREOF 5 The present invention aims to provide an amorphization technique for a compound represented by General Formula (1) and/or a salt thereof. The present invention provides an amorphizing agent for a compound represented by General Formula (1) and/or a salt thereof, which amorphizing agent comprises one or more selected from the group consisting of water-soluble polymers and acids. 10 [Fig. 1]