CAS Number: 86271-56-9
Chemical Name: 2,6-Diamino-5-hydroxy-3-(phenylazo)pyridine
Molecular Formula: C11H11N5O
Molecular Weight: 229.24

CAS Number: 94-78-0
Chemical Name: Phenazopyridine
Molecular Formula: C11H11N5
Molecular Weight: 213.24