... Chemistry New amphoteric compounds (19—24, 32a— c, 38, 43d—f) and prodrugs (44—60) of compound 19 were synthesized as ... Hokuriku Seiyaku Co., Ltd.,a Inokuchi 37–1–1, Katsuyama, Fukui 911–8555, Japan and Faculty of Pharmaceutical Sciences, Kanazawa ... 430 Vol. ...