Oblon, Fisher, Spivak, McClelland & Maier
Immunoactivator
 An immunoactivator comprising an effective amount of a thiazolobenzoxazine derivative of the formula, or its salt ##STR1## wherein R.sup.1 represents a hydrogen atom, carboxyl group or lower alkoxycarbonyl group, R.sup.2 represents a substituted or unsubstituted phenyl group, lower alkyl group or furyl group, and R.sup.3 represents a hydrogen atom or lower alkoxy group. 
SS Pharmaceutical Co., Ltd.
C
C07D
inventional
Tatsuhiko Hiroyuki Ryohta Hideaki
Katori Mizuno Tatezaki Matsuda