1,3,4-Oxadiazole-2(3H)-thione, 5-(4-amino-2-hydroxyphenyl)- 2-(4-Amino-2-hydroxyphenyl)-delta(sup 2)-1,3,4-oxadiazoline-5-thione 3687-07-8 WS 128 delta(sup 2)-1,3,4-OXADIAZOLINE-5-THIONE, 2-(4-AMINO-2-HYDROXYPHENYL)-