ANSAis
A1 - amino - 3 - nitro - sulphurous acid
B2 - amino — 3 - napthyl - sulphuric acid
C1 - amino - 2 - napthyl -4 -sulphanic acid
D1 - acyl - 2 - nitro - sulphalinic acid
A1 - amino - 3 - nitro - sulphurous acid
B2 - amino — 3 - napthyl - sulphuric acid
C1 - amino - 2 - napthyl -4 -sulphanic acid
D1 - acyl - 2 - nitro - sulphalinic acid