CAS Number: 161406-19-5
Chemical Name: 4-Aminobenzoic Acid-13C6
Molecular Formula: C13C6H7NO2
Molecular Weight: 143.09

CAS Number: 350820-01-8
Chemical Name: 4-Aminobenzoic Acid-d4
Molecular Formula: C7H3D4NO2
Molecular Weight: 141.16