Oblon, Fisher, Spivak, McClelland & Maier
Heterocyclic compounds
 Compounds of the formula ##STR1## where B is oxygen, sulfur, imino or >N--R.sup.1, the ring A may be substituted, and R, Y.sup.1 to Y.sup.4 and Z are conventional dye substituents. The compounds according to the invention give brilliant, very fast dyeings on polyesters and mass-colorations of plastics. 
BASF Aktiengesellschaft
C C
C09B C09B
inventional inventional
Christos Manfred Peter
Vamvakaris Patsch Neumann